The following error was reported evaluating the function in FunctionLine update: Unable to convert expression containing remaining symbolic function calls into double array

Hello,

I am trying to plot a signal using the fourier function.I dont know how to solve it or if i do something wrong.This is my code:

syms t w;

% Define the first signal u(t)-u(t-2) using the heaviside function
x1 = heaviside(t) - heaviside(t-2);

% Define the second signal u(t)-u(t-4)
x2 = heaviside(t) - heaviside(t-4);

%Multiply the signals
Z = fourier(x1) .* fourier(x2);

% Compute the convolution in the time domain
signal_in_time = ifourier(Z);

%display the graph:
figure(1);
fplot(signal_in_time);

Answer 1

[Walter Roberson]

syms t w;

% Define the first signal u(t)-u(t-2) using the heaviside function
x1 = heaviside(t) - heaviside(t-2);

% Define the second signal u(t)-u(t-4)
x2 = heaviside(t) - heaviside(t-4);

%Multiply the signals
Z = fourier(x1) .* fourier(x2)

Z = 

% Compute the convolution in the time domain
signal_in_time = ifourier(Z)

signal_in_time = 

Notice that this has unresolved fourier() calls -- places that the inverse fourier has trouble handling.

What can you do? Well you can use the laplace transform instead.

Z2 = laplace(x1) .* laplace(x2)

Z2 = 

signal_in_time2 = ilaplace(Z2)

signal_in_time2 = 

fplot(signal_in_time2)