NAN problem in MATLAB, Surf command

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

(my other question is if I can use 'Surf to plot T in x and y ranges?) I will appreciate your help, I am new to MATLAB. thank you :)

[Walter Roberson]

My suspicion would be that you are running into zero divided by zero, or else zero times infinity