Hi everyone, Can anybody help me by sending a MATLAB code for extracting frequency domain data from the time domain data (5000 points) present in .txt format.

Hi, I have an a time domain data present in .txt format,I want to extract the frequency domain from that and want to plot a graph. Can somebody help in this by sending a codes.I will attach a time domain file. Please help me out in this matter.Waiting for valuable reply.

Answer 1

[Walter Roberson]

fid = fopen('YourTextFile.txt', 'rt');
datacell = textscan(fid, '%f');
fclose(fid);
time_domain_data = datacell{1}(:);

frequency_domain_data = fft(time_domain_data);

Answer 2

[Image Analyst]

Other than fft(), you might also look at related functions like periodogram(), pwelch(), psd(), and spectrogram() if you have the Signal Processing Toolbox. Go here for a complete discussion with plenty of examples: http://www.mathworks.com/help/signal/spectral-analysis.html