Welcome to iraf.net Friday, April 26 2024 @ 10:39 AM GMT
| Gaba_p |
05/05/2017 01:53AM (Read 634 times)
|
|
|
Status: offline
Registered: 10/10/2008
Posts: 104
|
I'm trying to reproduce the 'sigma' column returned by the photcal.fitparams task (http://stsdas.stsci.edu/cgi-bin/gethelp.cgi?fitparams); see page 32 of the guide:
https://www.mn.uio.no/astro/english/services/it/help/visualization/iraf/daophot2.pdf
Following the trace, I see that the 'iraf/pkg/xtools/inlfit/ingresults.gx' file writes to that column the following values:
(sqrt (PIXEL (1.0) / Mem$t[wts1+i-1]))
I assume 'Mem$t[wts1+i-1]' is some kind of standard deviation? How can I reproduce the values in that column manually?
Also, since I'm at it, how is the 'average scatter' value obtained (also shown in the above mentioned page)? I tried:
mean(abs(function - fit))
but I can't reproduce the values shown there.
|
| |
|
|
| |
|
| Content generated in: 0.04 seconds |
|
New Topic
Post Reply
How does fitparams obtain the sigma column?
Quote
