Welcome to iraf.net Thursday, March 28 2024 @ 11:43 AM GMT

Buglog #226

  • Friday, September 17 1993 @ 08:13 PM GMT
  • Contributed by:
  • Views: 1,072
MODULE: artdata.mkobjects
SYSTEM: V2.9-V2.10.2
NUMBER:	226
MODULE:	artdata.mkobjects
SYSTEM:	V2.9-V2.10.2
DATE:	Fri Sep 17 14:13:24 MST 1993
FROM:	valdes

BUG:	The scales of the 'expdisk' and 'devauc' images are incorrect due
	to an integer truncation error.  The error is such that the actual
	output radius for a given input radius is given by the formulas:

	expdisk:  rout = rin * int(ln(D)/1.6783) / ln(D)/1.6783
	devauc:   rout = rin * int(ln(D)/7.67)**4) / (ln(D)/7.67)**4

	where D is the dynamic range parameter in the ARTDATA package
	parameters, ln() is the natural logarithm, int() is the integer
	truncation function, and ** is the exponentiation operator.
	From this one can, fudge the input radii to give the
	desired output radii, select a dynamic range where the correction
	factor is 1, or account for this as needed when the artificial
	image is analyzed.  The simplest thing is to adjust the dynamic
	range; for example, a dynamic range of 126514 for the 'expdisk'
	model is the closest to the default value of 10000 which will give
	correct output scales.

STATUS:	Fixed in V2.10.3

Buglog #226 | 0 comments | Create New Account

The following comments are owned by whomever posted them. This site is not responsible for what they say.



Privacy Policy
Terms of Use

User Functions

Login