why cant i plot graph with surf() function?

clc;clear all;

for t=0:0.02:2
    for x=0:0.1:10
        U=10*sin(2*pi*(t-(x/5)))+2*sin(2*pi*(t+(x/5)))
    end 
end

[Image Analyst]

Ooops - was this your homework that I just solved? I wasn't supposed to do that, but you didn't tag it as homework. If it's homework the poster is supposed to be honest and tag it as homework to let us know.

[ernest]

nope its not homework dont worry.just some random practice i find around

[Image Analyst]

OK, no problem then. If my answer worked, can you officially mark it as "Accepted"? Thanks in advance.

Answer 1

[Image Analyst]

You didn't index U - it's just a single number. You can either index it, or vectorize it. I show the vectorized method below:

T = 0:0.02:2;
X = 0:0.1:10;
[t, x] = meshgrid (T, X);
U=10*sin(2*pi*(t-(x/5)))+2*sin(2*pi*(t+(x/5)));
surf(U);