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Buglog #166
- Tuesday, February 25 1992 @ 11:37 PM GMT
- Contributed by: admin
- Views: 976
MODULE: apphot.polyphot
SYSTEM: V2.9
SYSTEM: V2.9
NUMBER: 166 MODULE: apphot.polyphot SYSTEM: V2.9 DATE: Tue Feb 25 16:37:41 MST 1992 FROM: davis BUG: The intersection points of an image line and a polygon could be incorrectly translated into a list of line segments if the polygon was concave and contained one or more sides exactly collinear with the image line. The symptom of this problem is a larger than expected difference (larger than can be accounted for by fractional pixel effects) in the computed area of the polygon as it is shifted to different positions in the image (shifting by floating point numbers tends to remove the condition of exact collinearity); or larger than expected differences in the area and flux of the same object measured with the same polygonal aperture at slightly different positions in different images (again shifting the polygon tends to remove the condition of exact collinearity). STATUS: The bug has been fixed in 2.10. There is no work around except to alter the shape of the polygon slightly. NUMBER: 279 MODULE: doslit, doecslit SYSTEM: V2.10-V2.10.2 DATE: Fri Feb 17 10:06:09 MST 1995 FROM: valdes BUG: If no arc image or standard star image is specified an error such as ERROR on line 103: OPEN: File does not exist (tmp$iraf1665j) doecslit () will appear. This is true even if one is not dispersion correcting or standard star fluxing. Thus, even if dispcor=no or fluxcal=no you must put a placeholder image name in the arcs and standard parameters. STATUS: Fixed in V2.10.3 and later such that not specifying arc and standard star images is ok if not dispersion or flux calibrating.
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