panke

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3 years, 146 days

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These are questions asked by panke


 

restart

" S3:=proc(psi) [[[cos(psi),-sin(psi),0],[sin(psi),cos(psi),0],[0,0,1]]]:  end  proc ;   S1:=proc(`ϕ`)  [[[1,0,0],[0,cos(`ϕ`),-sin(`ϕ`)],[0,sin(`ϕ`),cos(`ϕ`)]]]:   end proc;"

proc (psi) Matrix(3, 3, {(1, 1) = cos(psi), (1, 2) = -sin(psi), (1, 3) = 0, (2, 1) = sin(psi), (2, 2) = cos(psi), (2, 3) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 1}) end proc

 

proc (`ϕ`) Matrix(3, 3, {(1, 1) = 1, (1, 2) = 0, (1, 3) = 0, (2, 1) = 0, (2, 2) = cos(psi), (2, 3) = -sin(psi), (3, 1) = 0, (3, 2) = sin(psi), (3, 3) = cos(psi)}) end proc

(1)

``

S3(uu)

Matrix([[cos(uu), -sin(uu), 0], [sin(uu), cos(uu), 0], [0, 0, 1]])

(2)

S1(uu)

Matrix([[1, 0, 0], [0, cos(psi), -sin(psi)], [0, sin(psi), cos(psi)]])

(3)

``


 

Download test3.mw

Way i get the wrong output with procedure S1(uu)
 

arrow([u1, u2, u3], shape = cylindrical_arrow, length = sqrt(LinearAlgebra:-Transpose(f0).f0), color = [red, black, green]):

Why i get this error

Error: the number of colours in the COLOUR structure is not sufficient.Error: the number of colours in the COLOUR structure is not sufficient.Error: the number of colours in the COLOUR structure is not sufficient.Error: the number of colours in the COLOUR structure is not sufficient.Error: the number of colours in the COLOUR structure is not sufficient.Error: the number of colours in the COLOUR structure is not sufficient.

I have this list

L := {a = b, e = f};

I want to extract b and f

How can i do it ?

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