janhardo

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Never understood th eproc() without para...

Asked: janhardo 335 Product: Maple

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

Computing the fundamental matrix G for ...

Asked: janhardo 335 Product: Maple

August 09 2020

0 2

Something goes wrong in this worksheet with old code

Must be corrected
Thanks

fmatrix.mws

ODE plot not working...

Asked: janhardo 335 Product: Maple

August 08 2020

0 2

Don't get a DEplot

>	with(DEtools,DEplot);with(plots,display);

(1)

>	init3:=seq([0,k*0.2,0],k=-4..10);

(2)

The forward plot is p3:

>	p3:=DEplot([sys],[x,y],t=0..2,[init3],x=-3..2,y=-3..2,stepsize=.05,arrows=none,linecolor=black,thickness=1,axes=box,scaling=constrained):

Error, (in f) numeric exception: division by zero

he backward plot is np3:

>	np3:=DEplot([sys],[x,y],t=-2..0,[init3],x=-3..2,y=-3..2,stepsize=.05,arrows=none,linecolor=black,thickness=1,axes=box,scaling=constrained):

Warning, plot may be incomplete, the following errors(s) were issued:
   cannot evaluate the solution further left of -.29861232, probably a singularity
Warning, plot may be incomplete, the following errors(s) were issued:
   cannot evaluate the solution further left of -.93147185e-1, probably a singularity
Warning, plot may be incomplete, the following errors(s) were issued:
   cannot evaluate the solution further left of -.23648931e-1, probably a singularity
Warning, plot may be incomplete, the following errors(s) were issued:
   cannot evaluate the solution further left of -.27325542e-2, probably a singularity