How to plot 2D graph

Hi,

Here is the question;

and I want to calculate plot x-t-F graph for first 100 terms of n.

Sum=0;
for t=1:20
for x=1:20
    
for n=1:100
    Sum=Sum+(30/pi)*(1/n)*(exp(-(n^2)*(pi^2)*1.14*t/3600))*(1-cos(n*pi/2))*(sin(n*pi*x/60));
end
end;
sum(t)=Sum;
end;

Here is my code. I am quite new in matlab and I wanted to do it with for loops. I want to ask that is there any way to take the values of x and t randomly between intervals and find the F function for each time and plot them?

Thank you!

Answer 1

[Star Strider]

If I understand correctly what you want to do, this should work:

for t=1:20
    for x=1:20
        Sum=0;
        for n=1:100
            Sum=Sum+(30/pi)*(1/n)*(exp(-(n^2)*(pi^2)*1.14*t/3600))*(1-cos(n*pi/2))*(sin(n*pi*x/60));
        end
        accsum(x,t)=Sum;
    end
end

figure
meshc((1:20),(1:20),accsum)
grid on
xlabel('x')
ylabel('t')
zlabel('F(x,t)')
view(-130, 30)

.

[Onur Metin Mertaslan]

Yes, thank you very much. This is what I am exactly looking for.

[Star Strider]

As always, my pleasure!