I have data in Workspace in matlab (time domain). Frequency domain (FFT) responses are computed using MATLAB functions utilizing the data obtained from Workspace. How can help me to get FFT from my time domain signal stored in workspace.

get FFT from signal stored in workspace. the signal stored in workspace is .mat data.

Answer 1

[Walter Roberson]

data_struct = load('TheFileName.mat');

varnames = fieldnames(datastruct);
time_domain_data = data_struct.(varnames{1});

freq_data = fft(time_domain_data);

If you know the name of the variable the data is stored in in the .mat file then you can use it directly. For example if you know the data is stored in qx83t then you can use

data_struct = load('TheFileName.mat');
time_domain_data = data_struct.qx83t;

[vahid torabi]

I applied your code on my .mat data but it didn't work! I attached my .mat data, please check to know it works or it doesn't work.Thank you so much.

[vahid torabi]

my .mat data: first column is time and second column is value.