Error in code when using the Euler method

The line of code I am having trouble with is: u(n+1)=u(n)+dt*(cos(2*pi()*t).^2)-5*u.^2); T is an array which is why I have used the dot operator - the error message: unable to perform assignment because the left and right sides have a different number of elements. Would really appreciate any help

Answer 1

[Jan]

Use te debugger to examine the problem:

dbstop if error

Run the code again until it stops at the failing line. Then check the sizes:

size(u(n) + dt*(cos(2*pi*t).^2)-5*u.^2)

If this is not a scalar, you cannot assign it to the scalar u(n+1). Maybe you want u(n+1, :) or u(:, n+1) instead.