I'm studying the phenemenon of band gaps in a experiment, however the stop bands are proving hard to define using just a transmission spectrum dervived from the fft alogrithm.(adsbygoogle = window.adsbygoogle || []).push({});

I've heard that it may be possible to define the band region by plotting the dispersion relation of sound waves the sound waves and looking for regions of anomalous dispersion. Unfortunately I have no idea how to go about this, does anyone have any info on this sort of analysis that could get me started?

Could someone tell me which FT alogorithm I would need to get phase data as I think the fft only give amplitude and requency info?

Oh and one last thing, does anyone know how I can convert a matrix in matlab into one long vector (so that each successive column is kind of added to the end of one large column) I've been trying this for a while but not getting very far.

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Dispersion relation with Matlab

**Physics Forums | Science Articles, Homework Help, Discussion**