The error “Incorrect dimensions for matrix multiplication” obtained from simulating your code occurs when the two matrices have dimensions that cannot be multiplied. Click on this link to know more about the error.
Use the following code to resolve your error and to obtain the output as intended. Replace the last 3 lines of your code with the following code
x=exp(-t).*heaviside(t);
ts = -5: Tsample/2 :5; % time vector with equal number of data points as the variable s
x_interpolated = interp1(t,x,ts); % Interpolate x to have equal number of data points as s
plot(x_interpolated);
v=s.*x_interpolated; % The .* ensures each bit is multiplied correspondingly
plot(linspace(0,5,length(v)),v);
