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Harry Garst

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How to force Maple to use basic math res...

Harry Garst 239 Maple
linear-algebra abstract simplification
November 22 2024
2 2

Is there a way to force Maple to use basic linear algebra results?
Here is a result you can find in any linear algebra book (this one comes from Harville's Matrix Algebra From a Statistician's Perspective)
I'm using Maple to check my work and it would be helpful if some basic linear algebra results would be injected in Maple's algorithm.

> 

kernelopts(version); interface(version)

`Maple 2024.2, X86 64 WINDOWS, Oct 29 2024, Build ID 1872373`

  

`Standard Worksheet Interface, Maple 2024.2, Windows 11, October 29 2024 Build ID 1872373`

 (1)
> 

restart; with(LinearAlgebra)
> 

alias(`⨂` = LinearAlgebra:-KroneckerProduct)

`⨂`

 (2)

> 

for dim from 2 to 5 do A := Matrix(dim, dim, shape = symmetric, symbol = a); print(dim, Equal(1/`⨂`(A, A), `⨂`(1/A, 1/A)), simplify(1/`⨂`(A, A)-`⨂`(1/A, 1/A), symbolic)) end do; for dim from 2 to 5 do A := Matrix(dim, dim, shape = symmetric, symbol = a); print(dim, Equal(simplify(1/`⨂`(A, A)), simplify(`⨂`(1/A, 1/A))), simplify(1/`⨂`(A, A)-`⨂`(1/A, 1/A), symbolic)) end do

2, true, [`?`]

  

3, false, [`?`]

  

4, false, Matrix(16, 16, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (1, 5) = 0, (1, 6) = 0, (1, 7) = 0, (1, 8) = 0, (1, 9) = 0, (1, 10) = 0, (1, 11) = 0, (1, 12) = 0, (1, 13) = 0, (1, 14) = 0, (1, 15) = 0, (1, 16) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 0, (2, 5) = 0, (2, 6) = 0, (2, 7) = 0, (2, 8) = 0, (2, 9) = 0, (2, 10) = 0, (2, 11) = 0, (2, 12) = 0, (2, 13) = 0, (2, 14) = 0, (2, 15) = 0, (2, 16) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 0, (3, 4) = 0, (3, 5) = 0, (3, 6) = 0, (3, 7) = 0, (3, 8) = 0, (3, 9) = 0, (3, 10) = 0, (3, 11) = 0, (3, 12) = 0, (3, 13) = 0, (3, 14) = 0, (3, 15) = 0, (3, 16) = 0, (4, 1) = 0, (4, 2) = 0, (4, 3) = 0, (4, 4) = 0, (4, 5) = 0, (4, 6) = 0, (4, 7) = 0, (4, 8) = 0, (4, 9) = 0, (4, 10) = 0, (4, 11) = 0, (4, 12) = 0, (4, 13) = 0, (4, 14) = 0, (4, 15) = 0, (4, 16) = 0, (5, 1) = 0, (5, 2) = 0, (5, 3) = 0, (5, 4) = 0, (5, 5) = 0, (5, 6) = 0, (5, 7) = 0, (5, 8) = 0, (5, 9) = 0, (5, 10) = 0, (5, 11) = 0, (5, 12) = 0, (5, 13) = 0, (5, 14) = 0, (5, 15) = 0, (5, 16) = 0, (6, 1) = 0, (6, 2) = 0, (6, 3) = 0, (6, 4) = 0, (6, 5) = 0, (6, 6) = 0, (6, 7) = 0, (6, 8) = 0, (6, 9) = 0, (6, 10) = 0, (6, 11) = 0, (6, 12) = 0, (6, 13) = 0, (6, 14) = 0, (6, 15) = 0, (6, 16) = 0, (7, 1) = 0, (7, 2) = 0, (7, 3) = 0, (7, 4) = 0, (7, 5) = 0, (7, 6) = 0, (7, 7) = 0, (7, 8) = 0, (7, 9) = 0, (7, 10) = 0, (7, 11) = 0, (7, 12) = 0, (7, 13) = 0, (7, 14) = 0, (7, 15) = 0, (7, 16) = 0, (8, 1) = 0, (8, 2) = 0, (8, 3) = 0, (8, 4) = 0, (8, 5) = 0, (8, 6) = 0, (8, 7) = 0, (8, 8) = 0, (8, 9) = 0, (8, 10) = 0, (8, 11) = 0, (8, 12) = 0, (8, 13) = 0, (8, 14) = 0, (8, 15) = 0, (8, 16) = 0, (9, 1) = 0, (9, 2) = 0, (9, 3) = 0, (9, 4) = 0, (9, 5) = 0, (9, 6) = 0, (9, 7) = 0, (9, 8) = 0, (9, 9) = 0, (9, 10) = 0, (9, 11) = 0, (9, 12) = 0, (9, 13) = 0, (9, 14) = 0, (9, 15) = 0, (9, 16) = 0, (10, 1) = 0, (10, 2) = 0, (10, 3) = 0, (10, 4) = 0, (10, 5) = 0, (10, 6) = 0, (10, 7) = 0, (10, 8) = 0, (10, 9) = 0, (10, 10) = 0, (10, 11) = 0, (10, 12) = 0, (10, 13) = 0, (10, 14) = 0, (10, 15) = 0, (10, 16) = 0, (11, 1) = 0, (11, 2) = 0, (11, 3) = 0, (11, 4) = 0, (11, 5) = 0, (11, 6) = 0, (11, 7) = 0, (11, 8) = 0, (11, 9) = 0, (11, 10) = 0, (11, 11) = 0, (11, 12) = 0, (11, 13) = 0, (11, 14) = 0, (11, 15) = 0, (11, 16) = 0, (12, 1) = 0, (12, 2) = 0, (12, 3) = 0, (12, 4) = 0, (12, 5) = 0, (12, 6) = 0, (12, 7) = 0, (12, 8) = 0, (12, 9) = 0, (12, 10) = 0, (12, 11) = 0, (12, 12) = 0, (12, 13) = 0, (12, 14) = 0, (12, 15) = 0, (12, 16) = 0, (13, 1) = 0, (13, 2) = 0, (13, 3) = 0, (13, 4) = 0, (13, 5) = 0, (13, 6) = 0, (13, 7) = 0, (13, 8) = 0, (13, 9) = 0, (13, 10) = 0, (13, 11) = 0, (13, 12) = 0, (13, 13) = 0, (13, 14) = 0, (13, 15) = 0, (13, 16) = 0, (14, 1) = 0, (14, 2) = 0, (14, 3) = 0, (14, 4) = 0, (14, 5) = 0, (14, 6) = 0, (14, 7) = 0, (14, 8) = 0, (14, 9) = 0, (14, 10) = 0, (14, 11) = 0, (14, 12) = 0, (14, 13) = 0, (14, 14) = 0, (14, 15) = 0, (14, 16) = 0, (15, 1) = 0, (15, 2) = 0, (15, 3) = 0, (15, 4) = 0, (15, 5) = 0, (15, 6) = 0, (15, 7) = 0, (15, 8) = 0, (15, 9) = 0, (15, 10) = 0, (15, 11) = 0, (15, 12) = 0, (15, 13) = 0, (15, 14) = 0, (15, 15) = 0, (15, 16) = 0, (16, 1) = 0, (16, 2) = 0, (16, 3) = 0, (16, 4) = 0, (16, 5) = 0, (16, 6) = 0, (16, 7) = 0, (16, 8) = 0, (16, 9) = 0, (16, 10) = 0, (16, 11) = 0, (16, 12) = 0, (16, 13) = 0, (16, 14) = 0, (16, 15) = 0, (16, 16) = 0})

  

5, false, Matrix(25, 25, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (1, 5) = 0, (1, 6) = 0, (1, 7) = 0, (1, 8) = 0, (1, 9) = 0, (1, 10) = 0, (1, 11) = 0, (1, 12) = 0, (1, 13) = 0, (1, 14) = 0, (1, 15) = 0, (1, 16) = 0, (1, 17) = 0, (1, 18) = 0, (1, 19) = 0, (1, 20) = 0, (1, 21) = 0, (1, 22) = 0, (1, 23) = 0, (1, 24) = 0, (1, 25) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 0, (2, 5) = 0, (2, 6) = 0, (2, 7) = 0, (2, 8) = 0, (2, 9) = 0, (2, 10) = 0, (2, 11) = 0, (2, 12) = 0, (2, 13) = 0, (2, 14) = 0, (2, 15) = 0, (2, 16) = 0, (2, 17) = 0, (2, 18) = 0, (2, 19) = 0, (2, 20) = 0, (2, 21) = 0, (2, 22) = 0, (2, 23) = 0, (2, 24) = 0, (2, 25) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 0, (3, 4) = 0, (3, 5) = 0, (3, 6) = 0, (3, 7) = 0, (3, 8) = 0, (3, 9) = 0, (3, 10) = 0, (3, 11) = 0, (3, 12) = 0, (3, 13) = 0, (3, 14) = 0, (3, 15) = 0, (3, 16) = 0, (3, 17) = 0, (3, 18) = 0, (3, 19) = 0, (3, 20) = 0, (3, 21) = 0, (3, 22) = 0, (3, 23) = 0, (3, 24) = 0, (3, 25) = 0, (4, 1) = 0, (4, 2) = 0, (4, 3) = 0, (4, 4) = 0, (4, 5) = 0, (4, 6) = 0, (4, 7) = 0, (4, 8) = 0, (4, 9) = 0, (4, 10) = 0, (4, 11) = 0, (4, 12) = 0, (4, 13) = 0, (4, 14) = 0, (4, 15) = 0, (4, 16) = 0, (4, 17) = 0, (4, 18) = 0, (4, 19) = 0, (4, 20) = 0, (4, 21) = 0, (4, 22) = 0, (4, 23) = 0, (4, 24) = 0, (4, 25) = 0, (5, 1) = 0, (5, 2) = 0, (5, 3) = 0, (5, 4) = 0, (5, 5) = 0, (5, 6) = 0, (5, 7) = 0, (5, 8) = 0, (5, 9) = 0, (5, 10) = 0, (5, 11) = 0, (5, 12) = 0, (5, 13) = 0, (5, 14) = 0, (5, 15) = 0, (5, 16) = 0, (5, 17) = 0, (5, 18) = 0, (5, 19) = 0, (5, 20) = 0, (5, 21) = 0, (5, 22) = 0, (5, 23) = 0, (5, 24) = 0, (5, 25) = 0, (6, 1) = 0, (6, 2) = 0, (6, 3) = 0, (6, 4) = 0, (6, 5) = 0, (6, 6) = 0, (6, 7) = 0, (6, 8) = 0, (6, 9) = 0, (6, 10) = 0, (6, 11) = 0, (6, 12) = 0, (6, 13) = 0, (6, 14) = 0, (6, 15) = 0, (6, 16) = 0, (6, 17) = 0, (6, 18) = 0, (6, 19) = 0, (6, 20) = 0, (6, 21) = 0, (6, 22) = 0, (6, 23) = 0, (6, 24) = 0, (6, 25) = 0, (7, 1) = 0, (7, 2) = 0, (7, 3) = 0, (7, 4) = 0, (7, 5) = 0, (7, 6) = 0, (7, 7) = 0, (7, 8) = 0, (7, 9) = 0, (7, 10) = 0, (7, 11) = 0, (7, 12) = 0, (7, 13) = 0, (7, 14) = 0, (7, 15) = 0, (7, 16) = 0, (7, 17) = 0, (7, 18) = 0, (7, 19) = 0, (7, 20) = 0, (7, 21) = 0, (7, 22) = 0, (7, 23) = 0, (7, 24) = 0, (7, 25) = 0, (8, 1) = 0, (8, 2) = 0, (8, 3) = 0, (8, 4) = 0, (8, 5) = 0, (8, 6) = 0, (8, 7) = 0, (8, 8) = 0, (8, 9) = 0, (8, 10) = 0, (8, 11) = 0, (8, 12) = 0, (8, 13) = 0, (8, 14) = 0, (8, 15) = 0, (8, 16) = 0, (8, 17) = 0, (8, 18) = 0, (8, 19) = 0, (8, 20) = 0, (8, 21) = 0, (8, 22) = 0, (8, 23) = 0, (8, 24) = 0, (8, 25) = 0, (9, 1) = 0, (9, 2) = 0, (9, 3) = 0, (9, 4) = 0, (9, 5) = 0, (9, 6) = 0, (9, 7) = 0, (9, 8) = 0, (9, 9) = 0, (9, 10) = 0, (9, 11) = 0, (9, 12) = 0, (9, 13) = 0, (9, 14) = 0, (9, 15) = 0, (9, 16) = 0, (9, 17) = 0, (9, 18) = 0, (9, 19) = 0, (9, 20) = 0, (9, 21) = 0, (9, 22) = 0, (9, 23) = 0, (9, 24) = 0, (9, 25) = 0, (10, 1) = 0, (10, 2) = 0, (10, 3) = 0, (10, 4) = 0, (10, 5) = 0, (10, 6) = 0, (10, 7) = 0, (10, 8) = 0, (10, 9) = 0, (10, 10) = 0, (10, 11) = 0, (10, 12) = 0, (10, 13) = 0, (10, 14) = 0, (10, 15) = 0, (10, 16) = 0, (10, 17) = 0, (10, 18) = 0, (10, 19) = 0, (10, 20) = 0, (10, 21) = 0, (10, 22) = 0, (10, 23) = 0, (10, 24) = 0, (10, 25) = 0, (11, 1) = 0, (11, 2) = 0, (11, 3) = 0, (11, 4) = 0, (11, 5) = 0, (11, 6) = 0, (11, 7) = 0, (11, 8) = 0, (11, 9) = 0, (11, 10) = 0, (11, 11) = 0, (11, 12) = 0, (11, 13) = 0, (11, 14) = 0, (11, 15) = 0, (11, 16) = 0, (11, 17) = 0, (11, 18) = 0, (11, 19) = 0, (11, 20) = 0, (11, 21) = 0, (11, 22) = 0, (11, 23) = 0, (11, 24) = 0, (11, 25) = 0, (12, 1) = 0, (12, 2) = 0, (12, 3) = 0, (12, 4) = 0, (12, 5) = 0, (12, 6) = 0, (12, 7) = 0, (12, 8) = 0, (12, 9) = 0, (12, 10) = 0, (12, 11) = 0, (12, 12) = 0, (12, 13) = 0, (12, 14) = 0, (12, 15) = 0, (12, 16) = 0, (12, 17) = 0, (12, 18) = 0, (12, 19) = 0, (12, 20) = 0, (12, 21) = 0, (12, 22) = 0, (12, 23) = 0, (12, 24) = 0, (12, 25) = 0, (13, 1) = 0, (13, 2) = 0, (13, 3) = 0, (13, 4) = 0, (13, 5) = 0, (13, 6) = 0, (13, 7) = 0, (13, 8) = 0, (13, 9) = 0, (13, 10) = 0, (13, 11) = 0, (13, 12) = 0, (13, 13) = 0, (13, 14) = 0, (13, 15) = 0, (13, 16) = 0, (13, 17) = 0, (13, 18) = 0, (13, 19) = 0, (13, 20) = 0, (13, 21) = 0, (13, 22) = 0, (13, 23) = 0, (13, 24) = 0, (13, 25) = 0, (14, 1) = 0, (14, 2) = 0, (14, 3) = 0, (14, 4) = 0, (14, 5) = 0, (14, 6) = 0, (14, 7) = 0, (14, 8) = 0, (14, 9) = 0, (14, 10) = 0, (14, 11) = 0, (14, 12) = 0, (14, 13) = 0, (14, 14) = 0, (14, 15) = 0, (14, 16) = 0, (14, 17) = 0, (14, 18) = 0, (14, 19) = 0, (14, 20) = 0, (14, 21) = 0, (14, 22) = 0, (14, 23) = 0, (14, 24) = 0, (14, 25) = 0, (15, 1) = 0, (15, 2) = 0, (15, 3) = 0, (15, 4) = 0, (15, 5) = 0, (15, 6) = 0, (15, 7) = 0, (15, 8) = 0, (15, 9) = 0, (15, 10) = 0, (15, 11) = 0, (15, 12) = 0, (15, 13) = 0, (15, 14) = 0, (15, 15) = 0, (15, 16) = 0, (15, 17) = 0, (15, 18) = 0, (15, 19) = 0, (15, 20) = 0, (15, 21) = 0, (15, 22) = 0, (15, 23) = 0, (15, 24) = 0, (15, 25) = 0, (16, 1) = 0, (16, 2) = 0, (16, 3) = 0, (16, 4) = 0, (16, 5) = 0, (16, 6) = 0, (16, 7) = 0, (16, 8) = 0, (16, 9) = 0, (16, 10) = 0, (16, 11) = 0, (16, 12) = 0, (16, 13) = 0, (16, 14) = 0, (16, 15) = 0, (16, 16) = 0, (16, 17) = 0, (16, 18) = 0, (16, 19) = 0, (16, 20) = 0, (16, 21) = 0, (16, 22) = 0, (16, 23) = 0, (16, 24) = 0, (16, 25) = 0, (17, 1) = 0, (17, 2) = 0, (17, 3) = 0, (17, 4) = 0, (17, 5) = 0, (17, 6) = 0, (17, 7) = 0, (17, 8) = 0, (17, 9) = 0, (17, 10) = 0, (17, 11) = 0, (17, 12) = 0, (17, 13) = 0, (17, 14) = 0, (17, 15) = 0, (17, 16) = 0, (17, 17) = 0, (17, 18) = 0, (17, 19) = 0, (17, 20) = 0, (17, 21) = 0, (17, 22) = 0, (17, 23) = 0, (17, 24) = 0, (17, 25) = 0, (18, 1) = 0, (18, 2) = 0, (18, 3) = 0, (18, 4) = 0, (18, 5) = 0, (18, 6) = 0, (18, 7) = 0, (18, 8) = 0, (18, 9) = 0, (18, 10) = 0, (18, 11) = 0, (18, 12) = 0, (18, 13) = 0, (18, 14) = 0, (18, 15) = 0, (18, 16) = 0, (18, 17) = 0, (18, 18) = 0, (18, 19) = 0, (18, 20) = 0, (18, 21) = 0, (18, 22) = 0, (18, 23) = 0, (18, 24) = 0, (18, 25) = 0, (19, 1) = 0, (19, 2) = 0, (19, 3) = 0, (19, 4) = 0, (19, 5) = 0, (19, 6) = 0, (19, 7) = 0, (19, 8) = 0, (19, 9) = 0, (19, 10) = 0, (19, 11) = 0, (19, 12) = 0, (19, 13) = 0, (19, 14) = 0, (19, 15) = 0, (19, 16) = 0, (19, 17) = 0, (19, 18) = 0, (19, 19) = 0, (19, 20) = 0, (19, 21) = 0, (19, 22) = 0, (19, 23) = 0, (19, 24) = 0, (19, 25) = 0, (20, 1) = 0, (20, 2) = 0, (20, 3) = 0, (20, 4) = 0, (20, 5) = 0, (20, 6) = 0, (20, 7) = 0, (20, 8) = 0, (20, 9) = 0, (20, 10) = 0, (20, 11) = 0, (20, 12) = 0, (20, 13) = 0, (20, 14) = 0, (20, 15) = 0, (20, 16) = 0, (20, 17) = 0, (20, 18) = 0, (20, 19) = 0, (20, 20) = 0, (20, 21) = 0, (20, 22) = 0, (20, 23) = 0, (20, 24) = 0, (20, 25) = 0, (21, 1) = 0, (21, 2) = 0, (21, 3) = 0, (21, 4) = 0, (21, 5) = 0, (21, 6) = 0, (21, 7) = 0, (21, 8) = 0, (21, 9) = 0, (21, 10) = 0, (21, 11) = 0, (21, 12) = 0, (21, 13) = 0, (21, 14) = 0, (21, 15) = 0, (21, 16) = 0, (21, 17) = 0, (21, 18) = 0, (21, 19) = 0, (21, 20) = 0, (21, 21) = 0, (21, 22) = 0, (21, 23) = 0, (21, 24) = 0, (21, 25) = 0, (22, 1) = 0, (22, 2) = 0, (22, 3) = 0, (22, 4) = 0, (22, 5) = 0, (22, 6) = 0, (22, 7) = 0, (22, 8) = 0, (22, 9) = 0, (22, 10) = 0, (22, 11) = 0, (22, 12) = 0, (22, 13) = 0, (22, 14) = 0, (22, 15) = 0, (22, 16) = 0, (22, 17) = 0, (22, 18) = 0, (22, 19) = 0, (22, 20) = 0, (22, 21) = 0, (22, 22) = 0, (22, 23) = 0, (22, 24) = 0, (22, 25) = 0, (23, 1) = 0, (23, 2) = 0, (23, 3) = 0, (23, 4) = 0, (23, 5) = 0, (23, 6) = 0, (23, 7) = 0, (23, 8) = 0, (23, 9) = 0, (23, 10) = 0, (23, 11) = 0, (23, 12) = 0, (23, 13) = 0, (23, 14) = 0, (23, 15) = 0, (23, 16) = 0, (23, 17) = 0, (23, 18) = 0, (23, 19) = 0, (23, 20) = 0, (23, 21) = 0, (23, 22) = 0, (23, 23) = 0, (23, 24) = 0, (23, 25) = 0, (24, 1) = 0, (24, 2) = 0, (24, 3) = 0, (24, 4) = 0, (24, 5) = 0, (24, 6) = 0, (24, 7) = 0, (24, 8) = 0, (24, 9) = 0, (24, 10) = 0, (24, 11) = 0, (24, 12) = 0, (24, 13) = 0, (24, 14) = 0, (24, 15) = 0, (24, 16) = 0, (24, 17) = 0, (24, 18) = 0, (24, 19) = 0, (24, 20) = 0, (24, 21) = 0, (24, 22) = 0, (24, 23) = 0, (24, 24) = 0, (24, 25) = 0, (25, 1) = 0, (25, 2) = 0, (25, 3) = 0, (25, 4) = 0, (25, 5) = 0, (25, 6) = 0, (25, 7) = 0, (25, 8) = 0, (25, 9) = 0, (25, 10) = 0, (25, 11) = 0, (25, 12) = 0, (25, 13) = 0, (25, 14) = 0, (25, 15) = 0, (25, 16) = 0, (25, 17) = 0, (25, 18) = 0, (25, 19) = 0, (25, 20) = 0, (25, 21) = 0, (25, 22) = 0, (25, 23) = 0, (25, 24) = 0, (25, 25) = 0})

  

2, true, [`?`]

  

3, true, [`?`]

  

4, false, Matrix(16, 16, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (1, 5) = 0, (1, 6) = 0, (1, 7) = 0, (1, 8) = 0, (1, 9) = 0, (1, 10) = 0, (1, 11) = 0, (1, 12) = 0, (1, 13) = 0, (1, 14) = 0, (1, 15) = 0, (1, 16) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 0, (2, 5) = 0, (2, 6) = 0, (2, 7) = 0, (2, 8) = 0, (2, 9) = 0, (2, 10) = 0, (2, 11) = 0, (2, 12) = 0, (2, 13) = 0, (2, 14) = 0, (2, 15) = 0, (2, 16) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 0, (3, 4) = 0, (3, 5) = 0, (3, 6) = 0, (3, 7) = 0, (3, 8) = 0, (3, 9) = 0, (3, 10) = 0, (3, 11) = 0, (3, 12) = 0, (3, 13) = 0, (3, 14) = 0, (3, 15) = 0, (3, 16) = 0, (4, 1) = 0, (4, 2) = 0, (4, 3) = 0, (4, 4) = 0, (4, 5) = 0, (4, 6) = 0, (4, 7) = 0, (4, 8) = 0, (4, 9) = 0, (4, 10) = 0, (4, 11) = 0, (4, 12) = 0, (4, 13) = 0, (4, 14) = 0, (4, 15) = 0, (4, 16) = 0, (5, 1) = 0, (5, 2) = 0, (5, 3) = 0, (5, 4) = 0, (5, 5) = 0, (5, 6) = 0, (5, 7) = 0, (5, 8) = 0, (5, 9) = 0, (5, 10) = 0, (5, 11) = 0, (5, 12) = 0, (5, 13) = 0, (5, 14) = 0, (5, 15) = 0, (5, 16) = 0, (6, 1) = 0, (6, 2) = 0, (6, 3) = 0, (6, 4) = 0, (6, 5) = 0, (6, 6) = 0, (6, 7) = 0, (6, 8) = 0, (6, 9) = 0, (6, 10) = 0, (6, 11) = 0, (6, 12) = 0, (6, 13) = 0, (6, 14) = 0, (6, 15) = 0, (6, 16) = 0, (7, 1) = 0, (7, 2) = 0, (7, 3) = 0, (7, 4) = 0, (7, 5) = 0, (7, 6) = 0, (7, 7) = 0, (7, 8) = 0, (7, 9) = 0, (7, 10) = 0, (7, 11) = 0, (7, 12) = 0, (7, 13) = 0, (7, 14) = 0, (7, 15) = 0, (7, 16) = 0, (8, 1) = 0, (8, 2) = 0, (8, 3) = 0, (8, 4) = 0, (8, 5) = 0, (8, 6) = 0, (8, 7) = 0, (8, 8) = 0, (8, 9) = 0, (8, 10) = 0, (8, 11) = 0, (8, 12) = 0, (8, 13) = 0, (8, 14) = 0, (8, 15) = 0, (8, 16) = 0, (9, 1) = 0, (9, 2) = 0, (9, 3) = 0, (9, 4) = 0, (9, 5) = 0, (9, 6) = 0, (9, 7) = 0, (9, 8) = 0, (9, 9) = 0, (9, 10) = 0, (9, 11) = 0, (9, 12) = 0, (9, 13) = 0, (9, 14) = 0, (9, 15) = 0, (9, 16) = 0, (10, 1) = 0, (10, 2) = 0, (10, 3) = 0, (10, 4) = 0, (10, 5) = 0, (10, 6) = 0, (10, 7) = 0, (10, 8) = 0, (10, 9) = 0, (10, 10) = 0, (10, 11) = 0, (10, 12) = 0, (10, 13) = 0, (10, 14) = 0, (10, 15) = 0, (10, 16) = 0, (11, 1) = 0, (11, 2) = 0, (11, 3) = 0, (11, 4) = 0, (11, 5) = 0, (11, 6) = 0, (11, 7) = 0, (11, 8) = 0, (11, 9) = 0, (11, 10) = 0, (11, 11) = 0, (11, 12) = 0, (11, 13) = 0, (11, 14) = 0, (11, 15) = 0, (11, 16) = 0, (12, 1) = 0, (12, 2) = 0, (12, 3) = 0, (12, 4) = 0, (12, 5) = 0, (12, 6) = 0, (12, 7) = 0, (12, 8) = 0, (12, 9) = 0, (12, 10) = 0, (12, 11) = 0, (12, 12) = 0, (12, 13) = 0, (12, 14) = 0, (12, 15) = 0, (12, 16) = 0, (13, 1) = 0, (13, 2) = 0, (13, 3) = 0, (13, 4) = 0, (13, 5) = 0, (13, 6) = 0, (13, 7) = 0, (13, 8) = 0, (13, 9) = 0, (13, 10) = 0, (13, 11) = 0, (13, 12) = 0, (13, 13) = 0, (13, 14) = 0, (13, 15) = 0, (13, 16) = 0, (14, 1) = 0, (14, 2) = 0, (14, 3) = 0, (14, 4) = 0, (14, 5) = 0, (14, 6) = 0, (14, 7) = 0, (14, 8) = 0, (14, 9) = 0, (14, 10) = 0, (14, 11) = 0, (14, 12) = 0, (14, 13) = 0, (14, 14) = 0, (14, 15) = 0, (14, 16) = 0, (15, 1) = 0, (15, 2) = 0, (15, 3) = 0, (15, 4) = 0, (15, 5) = 0, (15, 6) = 0, (15, 7) = 0, (15, 8) = 0, (15, 9) = 0, (15, 10) = 0, (15, 11) = 0, (15, 12) = 0, (15, 13) = 0, (15, 14) = 0, (15, 15) = 0, (15, 16) = 0, (16, 1) = 0, (16, 2) = 0, (16, 3) = 0, (16, 4) = 0, (16, 5) = 0, (16, 6) = 0, (16, 7) = 0, (16, 8) = 0, (16, 9) = 0, (16, 10) = 0, (16, 11) = 0, (16, 12) = 0, (16, 13) = 0, (16, 14) = 0, (16, 15) = 0, (16, 16) = 0})

  

5, false, Matrix(25, 25, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (1, 5) = 0, (1, 6) = 0, (1, 7) = 0, (1, 8) = 0, (1, 9) = 0, (1, 10) = 0, (1, 11) = 0, (1, 12) = 0, (1, 13) = 0, (1, 14) = 0, (1, 15) = 0, (1, 16) = 0, (1, 17) = 0, (1, 18) = 0, (1, 19) = 0, (1, 20) = 0, (1, 21) = 0, (1, 22) = 0, (1, 23) = 0, (1, 24) = 0, (1, 25) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 0, (2, 5) = 0, (2, 6) = 0, (2, 7) = 0, (2, 8) = 0, (2, 9) = 0, (2, 10) = 0, (2, 11) = 0, (2, 12) = 0, (2, 13) = 0, (2, 14) = 0, (2, 15) = 0, (2, 16) = 0, (2, 17) = 0, (2, 18) = 0, (2, 19) = 0, (2, 20) = 0, (2, 21) = 0, (2, 22) = 0, (2, 23) = 0, (2, 24) = 0, (2, 25) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 0, (3, 4) = 0, (3, 5) = 0, (3, 6) = 0, (3, 7) = 0, (3, 8) = 0, (3, 9) = 0, (3, 10) = 0, (3, 11) = 0, (3, 12) = 0, (3, 13) = 0, (3, 14) = 0, (3, 15) = 0, (3, 16) = 0, (3, 17) = 0, (3, 18) = 0, (3, 19) = 0, (3, 20) = 0, (3, 21) = 0, (3, 22) = 0, (3, 23) = 0, (3, 24) = 0, (3, 25) = 0, (4, 1) = 0, (4, 2) = 0, (4, 3) = 0, (4, 4) = 0, (4, 5) = 0, (4, 6) = 0, (4, 7) = 0, (4, 8) = 0, (4, 9) = 0, (4, 10) = 0, (4, 11) = 0, (4, 12) = 0, (4, 13) = 0, (4, 14) = 0, (4, 15) = 0, (4, 16) = 0, (4, 17) = 0, (4, 18) = 0, (4, 19) = 0, (4, 20) = 0, (4, 21) = 0, (4, 22) = 0, (4, 23) = 0, (4, 24) = 0, (4, 25) = 0, (5, 1) = 0, (5, 2) = 0, (5, 3) = 0, (5, 4) = 0, (5, 5) = 0, (5, 6) = 0, (5, 7) = 0, (5, 8) = 0, (5, 9) = 0, (5, 10) = 0, (5, 11) = 0, (5, 12) = 0, (5, 13) = 0, (5, 14) = 0, (5, 15) = 0, (5, 16) = 0, (5, 17) = 0, (5, 18) = 0, (5, 19) = 0, (5, 20) = 0, (5, 21) = 0, (5, 22) = 0, (5, 23) = 0, (5, 24) = 0, (5, 25) = 0, (6, 1) = 0, (6, 2) = 0, (6, 3) = 0, (6, 4) = 0, (6, 5) = 0, (6, 6) = 0, (6, 7) = 0, (6, 8) = 0, (6, 9) = 0, (6, 10) = 0, (6, 11) = 0, (6, 12) = 0, (6, 13) = 0, (6, 14) = 0, (6, 15) = 0, (6, 16) = 0, (6, 17) = 0, (6, 18) = 0, (6, 19) = 0, (6, 20) = 0, (6, 21) = 0, (6, 22) = 0, (6, 23) = 0, (6, 24) = 0, (6, 25) = 0, (7, 1) = 0, (7, 2) = 0, (7, 3) = 0, (7, 4) = 0, (7, 5) = 0, (7, 6) = 0, (7, 7) = 0, (7, 8) = 0, (7, 9) = 0, (7, 10) = 0, (7, 11) = 0, (7, 12) = 0, (7, 13) = 0, (7, 14) = 0, (7, 15) = 0, (7, 16) = 0, (7, 17) = 0, (7, 18) = 0, (7, 19) = 0, (7, 20) = 0, (7, 21) = 0, (7, 22) = 0, (7, 23) = 0, (7, 24) = 0, (7, 25) = 0, (8, 1) = 0, (8, 2) = 0, (8, 3) = 0, (8, 4) = 0, (8, 5) = 0, (8, 6) = 0, (8, 7) = 0, (8, 8) = 0, (8, 9) = 0, (8, 10) = 0, (8, 11) = 0, (8, 12) = 0, (8, 13) = 0, (8, 14) = 0, (8, 15) = 0, (8, 16) = 0, (8, 17) = 0, (8, 18) = 0, (8, 19) = 0, (8, 20) = 0, (8, 21) = 0, (8, 22) = 0, (8, 23) = 0, (8, 24) = 0, (8, 25) = 0, (9, 1) = 0, (9, 2) = 0, (9, 3) = 0, (9, 4) = 0, (9, 5) = 0, (9, 6) = 0, (9, 7) = 0, (9, 8) = 0, (9, 9) = 0, (9, 10) = 0, (9, 11) = 0, (9, 12) = 0, (9, 13) = 0, (9, 14) = 0, (9, 15) = 0, (9, 16) = 0, (9, 17) = 0, (9, 18) = 0, (9, 19) = 0, (9, 20) = 0, (9, 21) = 0, (9, 22) = 0, (9, 23) = 0, (9, 24) = 0, (9, 25) = 0, (10, 1) = 0, (10, 2) = 0, (10, 3) = 0, (10, 4) = 0, (10, 5) = 0, (10, 6) = 0, (10, 7) = 0, (10, 8) = 0, (10, 9) = 0, (10, 10) = 0, (10, 11) = 0, (10, 12) = 0, (10, 13) = 0, (10, 14) = 0, (10, 15) = 0, (10, 16) = 0, (10, 17) = 0, (10, 18) = 0, (10, 19) = 0, (10, 20) = 0, (10, 21) = 0, (10, 22) = 0, (10, 23) = 0, (10, 24) = 0, (10, 25) = 0, (11, 1) = 0, (11, 2) = 0, (11, 3) = 0, (11, 4) = 0, (11, 5) = 0, (11, 6) = 0, (11, 7) = 0, (11, 8) = 0, (11, 9) = 0, (11, 10) = 0, (11, 11) = 0, (11, 12) = 0, (11, 13) = 0, (11, 14) = 0, (11, 15) = 0, (11, 16) = 0, (11, 17) = 0, (11, 18) = 0, (11, 19) = 0, (11, 20) = 0, (11, 21) = 0, (11, 22) = 0, (11, 23) = 0, (11, 24) = 0, (11, 25) = 0, (12, 1) = 0, (12, 2) = 0, (12, 3) = 0, (12, 4) = 0, (12, 5) = 0, (12, 6) = 0, (12, 7) = 0, (12, 8) = 0, (12, 9) = 0, (12, 10) = 0, (12, 11) = 0, (12, 12) = 0, (12, 13) = 0, (12, 14) = 0, (12, 15) = 0, (12, 16) = 0, (12, 17) = 0, (12, 18) = 0, (12, 19) = 0, (12, 20) = 0, (12, 21) = 0, (12, 22) = 0, (12, 23) = 0, (12, 24) = 0, (12, 25) = 0, (13, 1) = 0, (13, 2) = 0, (13, 3) = 0, (13, 4) = 0, (13, 5) = 0, (13, 6) = 0, (13, 7) = 0, (13, 8) = 0, (13, 9) = 0, (13, 10) = 0, (13, 11) = 0, (13, 12) = 0, (13, 13) = 0, (13, 14) = 0, (13, 15) = 0, (13, 16) = 0, (13, 17) = 0, (13, 18) = 0, (13, 19) = 0, (13, 20) = 0, (13, 21) = 0, (13, 22) = 0, (13, 23) = 0, (13, 24) = 0, (13, 25) = 0, (14, 1) = 0, (14, 2) = 0, (14, 3) = 0, (14, 4) = 0, (14, 5) = 0, (14, 6) = 0, (14, 7) = 0, (14, 8) = 0, (14, 9) = 0, (14, 10) = 0, (14, 11) = 0, (14, 12) = 0, (14, 13) = 0, (14, 14) = 0, (14, 15) = 0, (14, 16) = 0, (14, 17) = 0, (14, 18) = 0, (14, 19) = 0, (14, 20) = 0, (14, 21) = 0, (14, 22) = 0, (14, 23) = 0, (14, 24) = 0, (14, 25) = 0, (15, 1) = 0, (15, 2) = 0, (15, 3) = 0, (15, 4) = 0, (15, 5) = 0, (15, 6) = 0, (15, 7) = 0, (15, 8) = 0, (15, 9) = 0, (15, 10) = 0, (15, 11) = 0, (15, 12) = 0, (15, 13) = 0, (15, 14) = 0, (15, 15) = 0, (15, 16) = 0, (15, 17) = 0, (15, 18) = 0, (15, 19) = 0, (15, 20) = 0, (15, 21) = 0, (15, 22) = 0, (15, 23) = 0, (15, 24) = 0, (15, 25) = 0, (16, 1) = 0, (16, 2) = 0, (16, 3) = 0, (16, 4) = 0, (16, 5) = 0, (16, 6) = 0, (16, 7) = 0, (16, 8) = 0, (16, 9) = 0, (16, 10) = 0, (16, 11) = 0, (16, 12) = 0, (16, 13) = 0, (16, 14) = 0, (16, 15) = 0, (16, 16) = 0, (16, 17) = 0, (16, 18) = 0, (16, 19) = 0, (16, 20) = 0, (16, 21) = 0, (16, 22) = 0, (16, 23) = 0, (16, 24) = 0, (16, 25) = 0, (17, 1) = 0, (17, 2) = 0, (17, 3) = 0, (17, 4) = 0, (17, 5) = 0, (17, 6) = 0, (17, 7) = 0, (17, 8) = 0, (17, 9) = 0, (17, 10) = 0, (17, 11) = 0, (17, 12) = 0, (17, 13) = 0, (17, 14) = 0, (17, 15) = 0, (17, 16) = 0, (17, 17) = 0, (17, 18) = 0, (17, 19) = 0, (17, 20) = 0, (17, 21) = 0, (17, 22) = 0, (17, 23) = 0, (17, 24) = 0, (17, 25) = 0, (18, 1) = 0, (18, 2) = 0, (18, 3) = 0, (18, 4) = 0, (18, 5) = 0, (18, 6) = 0, (18, 7) = 0, (18, 8) = 0, (18, 9) = 0, (18, 10) = 0, (18, 11) = 0, (18, 12) = 0, (18, 13) = 0, (18, 14) = 0, (18, 15) = 0, (18, 16) = 0, (18, 17) = 0, (18, 18) = 0, (18, 19) = 0, (18, 20) = 0, (18, 21) = 0, (18, 22) = 0, (18, 23) = 0, (18, 24) = 0, (18, 25) = 0, (19, 1) = 0, (19, 2) = 0, (19, 3) = 0, (19, 4) = 0, (19, 5) = 0, (19, 6) = 0, (19, 7) = 0, (19, 8) = 0, (19, 9) = 0, (19, 10) = 0, (19, 11) = 0, (19, 12) = 0, (19, 13) = 0, (19, 14) = 0, (19, 15) = 0, (19, 16) = 0, (19, 17) = 0, (19, 18) = 0, (19, 19) = 0, (19, 20) = 0, (19, 21) = 0, (19, 22) = 0, (19, 23) = 0, (19, 24) = 0, (19, 25) = 0, (20, 1) = 0, (20, 2) = 0, (20, 3) = 0, (20, 4) = 0, (20, 5) = 0, (20, 6) = 0, (20, 7) = 0, (20, 8) = 0, (20, 9) = 0, (20, 10) = 0, (20, 11) = 0, (20, 12) = 0, (20, 13) = 0, (20, 14) = 0, (20, 15) = 0, (20, 16) = 0, (20, 17) = 0, (20, 18) = 0, (20, 19) = 0, (20, 20) = 0, (20, 21) = 0, (20, 22) = 0, (20, 23) = 0, (20, 24) = 0, (20, 25) = 0, (21, 1) = 0, (21, 2) = 0, (21, 3) = 0, (21, 4) = 0, (21, 5) = 0, (21, 6) = 0, (21, 7) = 0, (21, 8) = 0, (21, 9) = 0, (21, 10) = 0, (21, 11) = 0, (21, 12) = 0, (21, 13) = 0, (21, 14) = 0, (21, 15) = 0, (21, 16) = 0, (21, 17) = 0, (21, 18) = 0, (21, 19) = 0, (21, 20) = 0, (21, 21) = 0, (21, 22) = 0, (21, 23) = 0, (21, 24) = 0, (21, 25) = 0, (22, 1) = 0, (22, 2) = 0, (22, 3) = 0, (22, 4) = 0, (22, 5) = 0, (22, 6) = 0, (22, 7) = 0, (22, 8) = 0, (22, 9) = 0, (22, 10) = 0, (22, 11) = 0, (22, 12) = 0, (22, 13) = 0, (22, 14) = 0, (22, 15) = 0, (22, 16) = 0, (22, 17) = 0, (22, 18) = 0, (22, 19) = 0, (22, 20) = 0, (22, 21) = 0, (22, 22) = 0, (22, 23) = 0, (22, 24) = 0, (22, 25) = 0, (23, 1) = 0, (23, 2) = 0, (23, 3) = 0, (23, 4) = 0, (23, 5) = 0, (23, 6) = 0, (23, 7) = 0, (23, 8) = 0, (23, 9) = 0, (23, 10) = 0, (23, 11) = 0, (23, 12) = 0, (23, 13) = 0, (23, 14) = 0, (23, 15) = 0, (23, 16) = 0, (23, 17) = 0, (23, 18) = 0, (23, 19) = 0, (23, 20) = 0, (23, 21) = 0, (23, 22) = 0, (23, 23) = 0, (23, 24) = 0, (23, 25) = 0, (24, 1) = 0, (24, 2) = 0, (24, 3) = 0, (24, 4) = 0, (24, 5) = 0, (24, 6) = 0, (24, 7) = 0, (24, 8) = 0, (24, 9) = 0, (24, 10) = 0, (24, 11) = 0, (24, 12) = 0, (24, 13) = 0, (24, 14) = 0, (24, 15) = 0, (24, 16) = 0, (24, 17) = 0, (24, 18) = 0, (24, 19) = 0, (24, 20) = 0, (24, 21) = 0, (24, 22) = 0, (24, 23) = 0, (24, 24) = 0, (24, 25) = 0, (25, 1) = 0, (25, 2) = 0, (25, 3) = 0, (25, 4) = 0, (25, 5) = 0, (25, 6) = 0, (25, 7) = 0, (25, 8) = 0, (25, 9) = 0, (25, 10) = 0, (25, 11) = 0, (25, 12) = 0, (25, 13) = 0, (25, 14) = 0, (25, 15) = 0, (25, 16) = 0, (25, 17) = 0, (25, 18) = 0, (25, 19) = 0, (25, 20) = 0, (25, 21) = 0, (25, 22) = 0, (25, 23) = 0, (25, 24) = 0, (25, 25) = 0})

 (3)

Download Using_basic_linear_algebra.mw

Adjoint Matrix formulated as permuted H...

Harry Garst 239 Maple 2020
linearalgebra linear-algebra adjoint
December 08 2023
1 0

For a project I need to construct a large symbolic adjoint matrix, hoping it can be factored afterward into nice expressions.
In the worksheet, I present an adjoint matrix using permuted Hadamard products. What puzzles me is that only for even dimensions, I need to multiply it (elementwise) with a parity matrix. Okay, not a specific Maple question, but maybe someone can help me out.

Download Adjoint.mw

seq slower than proc ...

Harry Garst 239 Maple 2020
performance programming linear-algebra
May 22 2023
1 4

I learned about Dodgson calculation of the determinant only recently (https://en.m.wikipedia.org/wiki/Dodgson_condensation).
I am only interested in symbolic expressions of the determinant.
Furthermore, I compared several methods. Not surprisingly, the build in method is the fastest. But why is the seq method slower than the proc method for the Dodgson method? Is there anything I could do to program it more efficiently?
 

> 

restart; with(LinearAlgebra)
> 

with(combinat); with(GroupTheory)
> 

DetDef := proc (A) local i, n, sigma; description "Jeremy Johnson. Downloaded from https://www.cs.drexel.edu/~jjohnson/2016-17/winter/cs300/lectures/determinant.mw"; n := RowDimension(A); add(PermParity(Perm(sigma))*mul(A[i, sigma[i]], i = 1 .. n), `in`(sigma, permute([`$`(1 .. n)]))) end proc
> 

InnerMatrix := proc (M::Matrix) SubMatrix(M, 2 .. RowDimension(M)-1, 2 .. ColumnDimension(M)-1) end proc
> 

MatrixDet := proc (M::Matrix) local C, n, i, j; n := RowDimension(M)-1; C := Matrix(n, n); seq(seq(assign('C[i, j]', Determinant(M([i, i+1], [j, j+1]))), j = 1 .. n), i = 1 .. n); return C end proc
> 

Dodgson := proc(M::Matrix)
 MatrixDet(M);
InnerMatrix(M) ^~ (-1) *~ MatrixDet(MatrixDet(M));
do if 1 < RowDimension(%) then InnerMatrix(`%%`) ^~ (-1) *~ MatrixDet(%);
end if;
until RowDimension(%) = 1;
Trace(%):
end proc:
> 

Dodgsonseq := proc (E::Matrix) local w, dim, Z; dim := RowDimension(E); Z[dim] := E; Z[dim-1] := MatrixDet(E); Z[dim-2] := `~`[`*`](`~`[`^`](InnerMatrix(E), -1), MatrixDet(MatrixDet(E))); seq(assign('Z[w-1]', `~`[`*`](`~`[`^`](InnerMatrix(Z[w+1]), -1), MatrixDet(Z[w]))), w = dim-1 .. 1, -1); Trace(Z[1]) end proc
> 

LaPlace := proc (M::Matrix) local c; add((-1)^(c+1)*M[1, c]*Minor(M, 1, c), c = 1 .. ColumnDimension(M)) end proc
> 

dim := 7; A := Matrix(dim, dim, shape = symmetric, symbol = a)

7

 (1)
> 

start_time := time(); st := time[real](); Det1 := abs(A); CPUtime_used_Build_in_Determinant := time()-start_time; REALtime_used_Build_in_Determinant := time[real]()-st; start_time := time(); st := time[real](); Det2 := DetDef(A); CPUtime_used_Jeremy_Johnson_Determinant := time()-start_time; REALtime_used_Jeremy_Johnson_Determinant := time[real]()-st; start_time := time(); st := time[real](); Det3 := Dodgsonseq(A); CPUtime_usedDodgsonseq := time()-start_time; REALCPUtime_usedDodgsonseq := time[real]()-st; start_time := time(); st := time[real](); Det4 := Dodgson(A); CPUtime_usedDodgson := time()-start_time; REALtime_usedDodgson := time[real]()-st; start_time := time(); st := time[real](); Det5 := LaPlace(A); CPUtime_usedLaPlace := time()-start_time; REALtime_usedLaPlace := time[real]()-st; simplify(Det1-Det2); simplify(Det1-Det3); simplify(Det1-Det4); simplify(Det1-Det5)
``

0.32e-1

  

0.34e-1

  

0.93e-1

  

.108

  

47.094

  

41.295

  

40.766

  

38.158

  

0.31e-1

  

0.50e-1

  

0

  

0

  

0

  

0

 (2)

Download test_Determinants_symbolic.mw

multipliying nonconformable matrices sho...

Harry Garst 239 Maple 2021
multiplication matrix linearalgebra
October 26 2022
1 0

I made an error by trying to multiply two nonconformable matrices. I think, I should receive an error message. But in this example this did not occur.

Strange.mw

> 

restart; with(LinearAlgebra); alias(`&bigotimes;` = LinearAlgebra:-KroneckerProduct); interface(rtablesize = 16); kernelopts(version); interface(version)

`&bigotimes;`

[10, 10]

`Maple 2021.2, X86 64 LINUX, Nov 23 2021, Build ID 1576349`

`Standard Worksheet Interface, Maple 2021.2, Linux, November 23 2021 Build ID 1576349`

Matrices nonconformable, Maple should give error message:

> 

`&bigotimes;`(Matrix(1, 4, 1), IdentityMatrix(4)); Dimension(%); M := Matrix(4, 4, shape = symmetric, symbol = m); Dimension(%)

Matrix([[1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0], [0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0], [0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0], [0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1]])

4, 16

M := Matrix(4, 4, {(1, 1) = m[1, 1], (1, 2) = m[1, 2], (1, 3) = m[1, 3], (1, 4) = m[1, 4], (2, 2) = m[2, 2], (2, 3) = m[2, 3], (2, 4) = m[2, 4], (3, 3) = m[3, 3], (3, 4) = m[3, 4], (4, 4) = m[4, 4]}, storage = triangular[upper], shape = [symmetric])

4, 4

> 

MatrixMatrixMultiply(`&bigotimes;`(Matrix(1, 4, 1), IdentityMatrix(4)), DiagonalMatrix(Diagonal(M)))

Matrix([[m[1, 1], 0, 0, 0], [0, m[2, 2], 0, 0], [0, 0, m[3, 3], 0], [0, 0, 0, m[4, 4]]])

> 

`&bigotimes;`(Matrix(1, 4, 1), IdentityMatrix(4)).DiagonalMatrix(Diagonal(M))

Matrix([[m[1, 1], 0, 0, 0], [0, m[2, 2], 0, 0], [0, 0, m[3, 3], 0], [0, 0, 0, m[4, 4]]])

> 

KroneckerProduct(Matrix(1, 4, 1), IdentityMatrix(4)).DiagonalMatrix(Diagonal(M))

Matrix([[m[1, 1], 0, 0, 0], [0, m[2, 2], 0, 0], [0, 0, m[3, 3], 0], [0, 0, 0, m[4, 4]]])

> 

(Matrix(4, 16, {(1, 1) = 1, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (1, 5) = 1, (1, 6) = 0, (1, 7) = 0, (1, 8) = 0, (1, 9) = 1, (1, 10) = 0, (1, 11) = 0, (1, 12) = 0, (1, 13) = 1, (1, 14) = 0, (1, 15) = 0, (1, 16) = 0, (2, 1) = 0, (2, 2) = 1, (2, 3) = 0, (2, 4) = 0, (2, 5) = 0, (2, 6) = 1, (2, 7) = 0, (2, 8) = 0, (2, 9) = 0, (2, 10) = 1, (2, 11) = 0, (2, 12) = 0, (2, 13) = 0, (2, 14) = 1, (2, 15) = 0, (2, 16) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 1, (3, 4) = 0, (3, 5) = 0, (3, 6) = 0, (3, 7) = 1, (3, 8) = 0, (3, 9) = 0, (3, 10) = 0, (3, 11) = 1, (3, 12) = 0, (3, 13) = 0, (3, 14) = 0, (3, 15) = 1, (3, 16) = 0, (4, 1) = 0, (4, 2) = 0, (4, 3) = 0, (4, 4) = 1, (4, 5) = 0, (4, 6) = 0, (4, 7) = 0, (4, 8) = 1, (4, 9) = 0, (4, 10) = 0, (4, 11) = 0, (4, 12) = 1, (4, 13) = 0, (4, 14) = 0, (4, 15) = 0, (4, 16) = 1})).DiagonalMatrix(Diagonal(M))

Matrix([[m[1, 1], 0, 0, 0], [0, m[2, 2], 0, 0], [0, 0, m[3, 3], 0], [0, 0, 0, m[4, 4]]])

> 

`&bigotimes;`(Matrix(1, 4, 1), IdentityMatrix(4)).Matrix(4, 4, shape = diagonal, symbol = m)

Matrix([[m[1, 1], 0, 0, 0], [0, m[2, 2], 0, 0], [0, 0, m[3, 3], 0], [0, 0, 0, m[4, 4]]])

> 

whattype(`&bigotimes;`(Matrix(1, 4, 1), IdentityMatrix(4))); Dimension(`&bigotimes;`(Matrix(1, 4, 1), IdentityMatrix(4)))

Matrix

4, 16

> 

whattype(DiagonalMatrix(Diagonal(M))); Dimension(M)

Matrix

4, 4

hereafter results are correct: Matrices

nonconformable, therefore error messages appear.

> 

`&bigotimes;`(Matrix(1, 4, 1), IdentityMatrix(4)).M

Error, (in LinearAlgebra:-Multiply) first matrix column dimension (16) <> second matrix row dimension (4)

> 

`&bigotimes;`(Matrix(1, 4, 1), IdentityMatrix(4)).Matrix(4, 4, shape = symmetric, symbol = m)

Error, (in LinearAlgebra:-Multiply) first matrix column dimension (16) <> second matrix row dimension (4)

Download Strange.mw

indexed versus symbol...

Harry Garst 239 Maple
indexed
February 24 2022
2 3

I don't know how to fix this. What's wrong? Is there an alternative way to include underscores in a cat command?

``

> 

restart; with(LinearAlgebra)
> 

komb := proc (n::integer, m::integer) local L, a, j; L := [seq(cat(a, "__", j, ",", j), j = 1 .. n)]; add(mul(k), `in`(k, combinat:-choose(L, m))); return % end proc

proc (n::integer, m::integer) local L, a, j, k; L := [seq(cat(a, "__", j, ",", j), j = 1 .. n)]; add(mul(k), `in`(k, combinat:-choose(L, m))); return % end proc

 (1)
> 

komb(5, 5)

`a__1,1`*`a__2,2`*`a__3,3`*`a__4,4`*`a__5,5`

 (2)
> 

whattype(`a__1,1`)

symbol

 (3)
> 

A := Matrix(5, 5, shape = diagonal, symbol = a)

Matrix(%id = 36893489895174306860)

 (4)
> 

abs(A)

a[1, 1]*a[2, 2]*a[3, 3]*a[4, 4]*a[5, 5]

 (5)
> 

whattype(a[1, 1])

indexed

 (6)
> 

simplify(komb(5, 5)-abs(A))

`a__1,1`*`a__2,2`*`a__3,3`*`a__4,4`*`a__5,5`-a[1, 1]*a[2, 2]*a[3, 3]*a[4, 4]*a[5, 5]

 (7)

``

Download indexed.mw

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