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janhardo

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11 years, 41 days
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These are questions asked by janhardo

Computing the fundamental matrix G for ...

janhardo 700 Maple
differential-equations
August 09 2020
0 2

Something goes wrong in this worksheet with old code

Must be corrected
Thanks

fmatrix.mws

ODE plot not working...

janhardo 700 Maple
ode differential-equations deplot
August 08 2020
0 2

Don't get a DEplot 


 

> 

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

[DEplot]

  

[display]

 (1)
> 

 

> 

 

> 

 

> 

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

[0, -.8, 0], [0, -.6, 0], [0, -.4, 0], [0, -.2, 0], [0, 0., 0], [0, .2, 0], [0, .4, 0], [0, .6, 0], [0, .8, 0], [0, 1.0, 0], [0, 1.2, 0], [0, 1.4, 0], [0, 1.6, 0], [0, 1.8, 0], [0, 2.0, 0]

 (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

  

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

  
> 

 

> 

display({p1,p2,p3,np3});

Error, (in plots:-display) expecting plot structures but received: {np3}

  
> 

 


 

Download uitzoeken_ode_lesmateriaal_betounes_of_het_werkt.mw

When is the derivative of a function the...

janhardo 700 Maple
derivative differential-equations
August 03 2020
2 3

We tryto  find a solution to the differential equation f'(x)=f^(-1)(x).

How to get grey textboxes on this forum...

janhardo 700 MaplePrimes
August 03 2020
2 10

Tried several things to get a neat grey box with Maple text in it 
What to do for making this ? 

display or display3d?...

janhardo 700 Maple
plotting plots
July 30 2020
0 2

with(plots,implicitplot3d);with(plots, display3d);
                        [implicitplot3d]

Error, (in with) package plots does not export display3d

------------------------------
As i understand it correct: there is no display3d command in the plots package to find.

Someone is using this display3d in Maple ,but is doesn't matter , because display and display3d  working both the same 
Example : 

p1:=implicitplot3d(x^2+y^2-1=0,x=-2..2,y=-2..2,z=-2..2):
p2:=implicitplot3d(y^2+z^2-1=0,x=-2..2,y=-2..2,z=-2..2):
display({p1,p2});
display3d({p1,p2});
or even

display3DA({p1,p2}); gives 2 3d pics ?

Is there a special display3d command in Maple ?, because (one or more)  plot3d plotstructures with display should show all 3d pics in Maple  ?
 

 

 

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