What wrong with the code
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I have an assignment question which involve matlab to plot the above graph and below are the code I used.
y=linspace(0,6,10);
x=linspace(0,11,10);
[X,Y]=meshgrid(x,y);
U=(400/pi)*symsum((sin((n*pi*X)/11).*sinh(n*pi*Y/11))/(n*sinh((n*pi*6)/11)),n,1,200);
surf(X,Y,U)
and it return the error"Invalid parameter/value pair arguments"
I'm not sure why it display such error and i check by using simpler function like U=X.*Y, it able to plot the graph, so I cannot identify where the error in my original equation as below.
U=(400/pi)*symsum((sin((n*pi*X)/11).*sinh(n*pi*Y/11))/(n*sinh((n*pi*6)/11)),n,1,200);
but command like plot3(X,Y,U) is working .
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Accepted Answer
chris crowley
on 26 Oct 2021
Your superfluous use of parentheses made it hard to spot, but you have the wrong number of them in your calculation of U. Take a closer look.
Also, you could do this without needing the symbolic toolbox like this:
y=linspace(0,6,10);
x=linspace(0,11,10);
[X,Y]=meshgrid(x,y);
U = zeros(size(X));
for n = 1:2:200
U = U + sin(n*pi*X/11).*sinh(n*pi*Y/11)/ (n*sinh(n*pi*6/11));
end
U = (400/pi)*U;
surf(X,Y,U)
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