matlab function fft, Error using fft Invalid data type. First argument must be double, single, int8, uint8, int16, uint16, int32, uint32, or logical.

so i have to compute the fourier tranform of a signal but i got this error "Error using fft

Invalid data type. First argument must be double,

single, int8, uint8, int16, uint16, int32, uint32, or

logical."

here is my code

clc
syms t w
x=cos(2*pi*t/10);
f=fourier(x,w);
reversef=simplify(ifourier(f,t));
t = [0 5];
N1=64;
metroX=abs(fft(x,N1));
subplot(2,1,1)
plot(metroX,"Color",'red')
xlabel('METRO')
goniaX=angle(fft(x,N1));
subplot(2,1,2)
plot(goniaX,"Color",'green')
xlabel('FASI')

Answer 1

[Paul]

At this line

metroX=abs(fft(x,N1));

the variable x is still a sym object. The input to fft() must be a sequence of actual numbers. Maybe it should be this:

N1=64;
t = linspace(0,5,N1); % define 64 time values
x = cos(2*pi*t/10);   % define 64 x values
metroX=abs(fft(x,N1));