How can I plot spectrogram from discrete data?

I have opening valve data and want to analyze my data in spectrogram but don't know how to plot it

Answer 1

[Bjorn Gustavsson]

Have a look at the documentation for the matlab function spectrogram:

helpwin spectrogram

From the question it seems that you're relatively new to matlab, if so I suggest you look around in the documentation a little bit just to get familiar with what's available and where to find stuff. Also have a look at the documentation for the function lookfor.

HTH