How to solve the following matlab problem?

This is the code in which I am working on right now.

    % b = 10000; % frequency 
    a = 0.5; %amplitude 
    c=440*1.0595^(3); 
    for j = 1:7; 
    for i= 1:24; 
    A(i,j)= a*cos(b*i)+c; %c is used for make an offset 
    end; 

   surf(A);

Now, The goal is to adjust the line A(i,j)=cos(i) so that the plot shows about 50 cosine curves in the middle of the day, and about 5 curves in the middle of the night. Here, total of 24 rows, first row is 12 o'clock, middle of the day. I have to play with values for these 3 constants (b, a and c) until my plot is correct (or fit with the above description). I have tried a lot by changing the value but I failed. Please help me. And ask me for update if my question is not clear to you. Thank you.

Answer 1

[Image Analyst]

Is this your homework? You're going to need 3 single for loops, one for each part of the day, not two nested for loops.

t = 1 : 50
for h = 1 : 8
   A(h,:) = ...some function of t.......
end
for h = 9 : 16
   A(h,:) = ...
end
for h = 17 : 24
   A(h,:) = ...
end