Register to reply

Matlab-Plot Power Spectrum of time series

by pigasos54
Tags: matlabplot, power, series, spectrum, time
Share this thread:
Aug18-10, 09:43 AM
P: 1
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.
seems right?

Any suggestions?
Thank you all
Phys.Org News Partner Science news on
Sapphire talk enlivens guesswork over iPhone 6
Geneticists offer clues to better rice, tomato crops
UConn makes 3-D copies of antique instrument parts

Register to reply

Related Discussions
BER plot using matlab Math & Science Software 0
3D plot versus time in Matlab Math & Science Software 0
3D Plot in Matlab Programming & Computer Science 6
Computing the power spectrum via matlab Advanced Physics Homework 0
Matlab Plot Engineering, Comp Sci, & Technology Homework 1