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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chris crowley
2021-10-26
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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