About Chandra Archive Proposer Instruments & Calibration Newsletters Data Analysis HelpDesk Calibration Database NASA Archives & Centers Chandra Science Links

Skip the navigation links
Last modified: December 2008

URL: http://cxc.harvard.edu/chips4.1/apply_contour_transform_inverse.sl.html
AHELP for ChIPS 4.1

apply_contour_transform_inverse

Context: sl.chips

Synopsis

Applies the inverse of a contour's transform to the contour data.

Syntax

apply_contour_transform_inverse([id]);

Description

  • id - an optional ChipsId structure containing values to modify the currency state for the command, or a string to specify the id of the contour to operate on.

The apply_contour_transform_inverse command applies the inverse of the tranform, which is already associated with the contour. This command is part of the advanced ChIPS module; refer to "ahelp chips" for information on loading the module.

Transforms are originally applied to contours either when the contour is created or after the set_contour_transform ("ahelp set_contour_transform") function has been called. If that transform has an inverse, calling apply_contour_transform_inverse will apply the inverse of that transform to the contour.

Calling apply_contour_tranform_transform multiple times will apply the inverse of the transform to the data set multiple time.

Example

chips> require ("chips_all");
chips> add_contour("contour.fits","wcs=params");
chips> apply_contour_transform_inverse ();

Creates a contour with the params coordinate system applied. The inverse of the transform is applied.

Bugs

See the bugs pages on the ChIPS website for an up-to-date listing of known bugs.

Last modified: December 2008



The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory.
60 Garden Street, Cambridge, MA 02138 USA.    Email: cxcweb@head.cfa.harvard.edu
Smithsonian Institution, Copyright © 1998-2004. All rights reserved.