Advanced Search

janhardo

700 Reputation

12 Badges

11 years, 41 days
Contact janhardo

MaplePrimes Activity


These are questions asked by janhardo

Something chanced in DEtools ?...

janhardo 700 Maple V
ode detools differential-equations
August 27 2020
1 8

CH10A.MWS

Old worksheets with linear algebra...

janhardo 700
linearalgebra linalg
August 17 2020
2 1

Try to convert the old worksheet to the modern linear algebra package ( student )? 


 

> 

restart:
> 

with(LinearAlgebra):
> 

 

> 

v1:=(3/4-lambda)*x1+3*x2+2*x3=0:
> 

v2:=3/4*x1-lambda*x2=0:
> 

v3:=1/3*x2-lambda*x3=0:
> 

stelsel:={v1,v2,v3}:
> 

 

 

        We bepalen nu de bijbehorende determinant, en onderzoeken voor welke waarden van    deze

        determinant  0  is:

 

> 

C:=Matrix([[3/4-lambda,3,2],[3/4,-lambda,0],[0,1/3,-lambda]]);

Matrix(3, 3, {(1, 1) = 3/4-lambda, (1, 2) = 3, (1, 3) = 2, (2, 1) = 3/4, (2, 2) = -lambda, (2, 3) = 0, (3, 1) = 0, (3, 2) = 1/3, (3, 3) = -lambda})

 (1)
> 

solve(det(C)=0);

Error, (in Engine:-Dispatch) badly formed input to solve: not fully algebraic

  
> 

 

 

  

   Nu onderzoeken we, wat de bijbehorende oplossingen zijn:

 

     Voor   :   λ "= - 1/(4)"

 

> 

lambda:=-1/4:
> 

solve(stelsel);

{x1 = x1, x2 = -3*x1, x3 = 4*x1}

 (2)
> 

 

===========================================================
Maple v 4

> 

 

> 

 


 

Download uitw_03_m_recent.mw

 

 

How to get this Maple V R4 worksheet in ...

janhardo 700 Maple 2020
classic worksheet
August 15 2020
0 8

Got a lot of worksheets who are not complete anymore once opened in maple 2020

It can be only opened with a old version of Maple
Can it be imported in Maple 2020?

example 

Dynmod03.mws

The right notation for a ode ? ...

janhardo 700 Maple
derivative ode syntax
August 15 2020
1 1

Found in old studymaterial about Loka-volterra ode 

dsolve({D(N)(t)=r*N(t)-k*N(t)^2,N(0)=N[0]},N(t));

Seems to me not logical notation to use a D operator  : D(N)(t)  for this ode : makes it unneeded complicated this notation..or do i miss something?

Never understood th eproc() without para...

janhardo 700 Maple
procedure
August 09 2020
1 6

Study a example 

Procedures. Declare local variables within procedures.
> # Program 1: Procedures.
> # The norm of a 3-dimensional vector.
> norm3d:=proc() local a,b,c;sqrt(aˆ2+bˆ2+cˆ2) end;
> norm3d(3,4,5);
5√(2)

Must say it was never clear for me the procedure () 
Never have read in the tutorials or study material the use of proc ( )  ( i did not read them all, so probably i missed it somewhere )

The procedure norm3d()  i get not working , because i don't not know how to use it 

 

First 12 13 14 15 16 17 18 Last Page 14 of 22