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Last modified: December 2009

URL: http://cxc-newtest.cfa.harvard.edu/ciao4.2/pix_gac_to_gdp.html
AHELP for CIAO 4.2

pix_gac_to_gdp

Context: pixlib

Synopsis

Convert from the Grating diffracted Angular coordinates (GAC) to Grating Dispersion Plane (GDP) coordinate system.

Syntax

Array_Type pix_gac_to_gdp( Double_Type x, Double_Type y )

Description

This routine converts a position in the Grating diffracted Angular Coordinate (GAC) system to the matching position in the Grating Dispersion Plane (GDP) coordinate system, using the current settings of the pixlib module. The x value gives the grating dispersion and the y value the cross-dispersion coordinate, both given in degrees. The return value is a two-element array which gives the GDP coordinates in pixels.

Bugs

See the bugs page for the pixlib library on the CIAO website for an up-to-date listing of known bugs.

See Also

modules
pixlib
pixlib
pix_gdp_to_gac, pix_get_energy, pix_get_grating_wavelength

Last modified: December 2009