Synopsis

PDX_MSGT gdx_EvalArcDerivs(long option, T_GDX_ARC *gdx_arc, int max_deriv, double tval, double (*derivs)[3])

Purpose

Evaluate derivatives on a GDX conic curve

Description

For a give S parameter value, evaluates the requested derivatives on a GDX arc. The tval parameter values is the unnormalized arc parameter value by default. A max_deriv > 4 returns 0.0 derivative values.

Input

option

GDX_UNNORM

Unnormalize the parameter value

gdx_arc

The GDX arc curve data structure

max_deriv

The maximium deriviative desired

tval

The parameter value

Output

derivs

The 3D deriviatives

Return

      GDX_NOERR
      GDX_PARMOUTOFRANGE
      .fi