DOUBLE PRECISION FUNCTION AR13AE(G,V) DOUBLE PRECISION G, V
Computes the mach number given the Prandtl-Meyer angle .
ENTRY: Specific heat constant .
ENTRY: Prandtl-Meyer angle .
Return value
This function returns the mach number for the given mach Prandtl-Meyer angle or NAN (Not-a-Number) if an error has
occurred).