NAN problem in MATLAB, Surf command

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nargess 2014-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/111463-nan-problem-in-matlab-surf-command

评论： Walter Roberson 2014-1-5

hi dear friends I am back with another problem. I am trying to write a code in MATLAB to plot the following series, but it doesn't work.

I took the ";" to see where the problem is. when I changed m's range to for example 1 to 100 it gives the values for S1 , but as I change it to higher number it returns:

S1= NAN

. . . S1= NAN

here is my code!(first I just want to calculate the series and then I will multiply it by (T1*2) (by the way the ranges for x and y are given and i can not change them)

for x=0:0.01:0.3;

     for y=0:0.01:0.4;
        Sum1=0;
        for m=1:10000 
        S1=((1-cos(m*pi))/(m*pi))*((sinh(m*pi*(0.4-y)/0.3))/sinh(m*pi*0.4/0.3))*(sin(m*pi*x/0.3))
        Sum1=Sum1+S1;
     end
 end