Power spectrum generation from light curve

I have to draw a plot between frequency(x axis) and power(y axis).

Using a file with first column time, second column value for corresponding time(in counts/second)

please help me with this...

[Rednar]

In which file format do you have the power spectrum info?

[aditi]

i want the powe spectrum...i have only the file with first column time, second column value for corresponding time(in counts/second) which is in .dat format

Answer 1

[Image Analyst]

Have you tried using fft() to get the spectrum of your time domain data?

[aditi]

how to use it??

[Image Analyst]

spectrum = fft(yourTImeDomainSignal);

More in the help and on Steve's blog: http://blogs.mathworks.com/steve/category/fourier-transforms/