MATLAB Matlab-Plot Power Spectrum of time series

  • Thread starter pigasos54
  • Start date
Hi all,

and thank you for reading/responding to my thread.I have a problem which involves time series and its power spectra.

Some background:
I have an 10.000xN matrix(called matr) whose columns are individual time series with real data values and I want to plot their power spectra against frequency.These time series where generated by an iterative map which involved a sin function with omega=0.1. Plotting freq versus power I might be able to see if any harmonics are present.

Below are the steps I take in Matlab:

y=fft(matr) % get the fourier transform of the matrix
y=(abs(y)).^2 %this is the power spectra

Is the above right?

Also I'm puzzled as to what frequency range I should use.
Does
freq=(0:10000-1)/10000
seems right?

Any suggestions?
Thank you all
 

Want to reply to this thread?

"Matlab-Plot Power Spectrum of time series" You must log in or register to reply here.

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top