double armcmm(double g, double m, int *ierr)
Compute given normal mach number, 
.
| Argument | Intent | Description |
| g | in | Specific heat constant |
| m | in | Mach number |
| ierr | out | (optional) Return status code |
Specific heat ratio 
.
Given 
.
Return Value
Characteristic mach number 
or NAN on error.
