How do I plot fourier transform signals in Matlab

To find Fourier transform (spectrum) of the following signals using MATLAB command “fourier”. To make a plot of signal and spectrum (modulus)

f(t)=e^(-|t| )*cos⁡(20t)

[Star Strider]

Replace:

e^(-|t| )

with:

exp(-|t| )

then put a multiplication operator vetween 20 and ‘t’:

cos⁡(20*t)

and go from there.

[Lucy Mokaya]

that is the signal that I need to plot

Answer 1

[Star Strider]

f = @ (t) exp(-abs(t)).*cos(20*t);

figure
fplot(f)

for the Symbolic Math Toolbox, this becomes:

syms t 
f(t) = exp(-abs(t))*cos(20*t);

I leave the rest to you.

[Lucy Mokaya]

Thank you

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

.

[Lucy Mokaya]

yes, it did help with the plotting the signal, still figuring out to plot the spectrum