arshup - Compute given density factor p2/p1

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3.3.3 arshup - Compute given density factor $p2/p1$

double arshup(double g, double p, int *ierr);

Compute pressure factor based upon pressure factor $p2/p1$ .

Performance
Fixed

Arguments

G - REAL: ENTRY: Specific heat constant $γ$ .
P - REAL: ENTRY: Pressure fraction $p /p > 0 2 1$ .
IERR - INTEGER: EXIT: (optional) Return status code.

Status codes

-1: Specific heat ratio $γ≤ 1$ .
-2: Given $p2/p1$ out of range.

Return Value
Density fraction $ρ2/ρ1$ or NAN on error.

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