need help solving this summation

Question

Luke Radcliff 2016-6-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/289301-need-help-solving-this-summation

评论： Roger Stafford 2016-6-11

采纳的回答： Roger Stafford

pic6.png

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I need to solve this, but keep getting an error about the matrix, probably dealing with the x and y variables set.

L=3; W=5; x=linspace(0,L,10); 
y = linspace(0,W,7); N=9; 
P = 1:2:N
w = 2/pi .* sum(2./P .* sin(P.*pi.*x./L) .* (sinh(P.*pi.*y./L) ./ sinh(P.*pi.*W./L)))

there is a picture attached, showing the summation, I might not even be doing this right Im new to matlab. It has to be done using the sum function not symsum, a for loop also can be done to solve this if possible.

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Walter Roberson 2016-6-10

That image is too small to read clearly.

Luke Radcliff 2016-6-10

Okay I enlarged the image

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Answer 1

Roger Stafford 2016-6-11

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/289301-need-help-solving-this-summation#answer_225153

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Make these changes in your code:

   L=3;
   W=5;
   x=linspace(0,L,10); 
   y = linspace(0,W,7);
   N=9; 
   P = 1:2:N
   for ix = 1:10
     for iy  = 1:7
       w(ix,iy) = 2/pi .* sum(2./P .* sin(P.*pi.*x(ix)./L) .* (sinh(P.*pi.*y(iy)./L) ./ sinh(P.*pi.*W./L)));
     end
   end

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Luke Radcliff 2016-6-11

wouldnt I not need the sum function any more since its a for loop now.

Roger Stafford 2016-6-11

You need to sum with respect to the five values in P. Either do it with the 'sum' function or make another nested for-loop (the latter of which seems a little unnecessary - 'sum' does its job quite well.)

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