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alfarunner

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10 years, 171 days
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These are questions asked by alfarunner

double indices in seq creating a pointpl...

alfarunner 90 Maple
seq pointplot plotting
April 04 2022
3 2

How do I create a pointplot with different values of a parameter?

I tried

pointplot([seq([k, a(k, a0)], k = 0 .. 10, a0 = [0, 50, 100, 150, 200])]);
Error, invalid input: seq expects its 3rd argument, step, to be of type numeric, but received a0 = [0, 50, 100, 150, 200]
NULL;

double sum in pde...

alfarunner 90
syntax add
May 18 2018
0 2

I got a double sum as a solution to heat equation in 2d. How do I plot that för different time values? 

I can't get the right syntax for add, op

 

How to plot summation from a pde solutio...

alfarunner 90
pde pdsolve
April 29 2018
2 2
BVP := [4*(diff(u(x, t), t))-9*(diff(u(x, t), x, x))-5*u(x, t) = 0, u(0, t) = 0, u(6, t) = 0, u(x, 0) = sin((1/6)*Pi*x)^2];
pdsolve(BVP);
        
U := unapply(rhs(sol), [x, t]);
  
plot3d(eval(U(x, t), infinity = 20), x = 0 .. 6, t = 0 .. 4);
Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct

 

Fourier series=f(x,t,n)...

alfarunner 90
series fourier
March 26 2018
1 1

If I have a fourier series as a function of x and t and summation goes from n=1 to eternity how can I get a new function, say F, with unapply so that F=F(x,t,n)?

So instead of plotting F from n=1 to eternity I want to plot e.g from n=1 to n=10

 

Two solutions required...

alfarunner 90
solve rootfinding fsolve
February 27 2018
3 3

Why can't MAple give me two solutions of

-2*sqrt(-K[1]^2+1)*K[1]+4*K[1]^2-Pi-2*arctan(sqrt(-K[1]^2+1)/K[1])=0

I only get -2*10^-13. There should be one K[1]=0.983 about

 

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