I have a 2D graph that I have created of frequency vs. amplitude as a way to characterize a signal. I am trying to figure out how to write script that takes the WAV I have already imported into MATLAB, and figure out the peaks, the troughs, and the distance between each one. Can someone please help me with some general guidelines, not a complete code, for a script that will help me do this?
There are several submissions on the file exchange for this. For instance this one, seems applicable (I haven't tested it myself, but it looks good).
Try to search a bit on the file exchange and you will likely find something you can use.
You can also have a look at this question, and this one.