This script will attempt to find the band gaps in a phononic crystal by carrying out a Plane Wave Expansion of the various quantities It is for an acoustic wave equation with pressure instead of the displacement as prescribed in App. Phys. Lett. 70 3218 There are 3 programs, one for short, one for elastic long and the other one is for acoustic long

Triangular Array PWE\Triangular_Array_PWE.asv
....................\Triangular_Array_PWE.m
....................\Triangular_Array_PWE_Acoustic_long.asv
....................\Triangular_Array_PWE_Acoustic_long.m
Triangular Array PWE

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