NAME: wfpc2_distorted PURPOSE: (one line only) Compute inverse of the wfpc2\_metric function. DESCRIPTION: Iterative reverse solution of wfpc2_metric (HST WFPC2 camera distortion model). This depends entirely on the solutions in the wfpc2_metric program. CATEGORY: CCD data processing CALLING SEQUENCE: wfpc2_distorted,xundist,yundist,xdist,ydist INPUTS: xundist - X coordinate in the undistorted (sky) plane yundist - Y coordinate in the undistorted (sky) plane OPTIONAL INPUT PARAMETERS: ITER - Number of iteration to run to get the answer (default=1) FILTER - String with the name of the filter used (this defines the distortion coefficients used. KEYWORD INPUT PARAMETERS: OUTPUTS: xdist - X coordinate in the native chips coordinates ydist - Y coordinate in the native chips coordinates KEYWORD OUTPUT PARAMETERS: COMMON BLOCKS: SIDE EFFECTS: RESTRICTIONS: PROCEDURE: MODIFICATION HISTORY: Written by Peter Collins, Lowell Observatory, circa 2008 2008/12/15, MWB, promoted internal calculations to double precision 2010/03/08, MWB, placed into library with documentation