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Code Tools: Evaluating Spline Coefficients

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  • Tuesday, December 06 2005 @ 04:58 PM GMT
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Code Snippets

One of the long-forgotten ADASS newsgroups was adass.iraf.sources, the point of which was to allow users to post small bits of code others may find useful. While we work to decide how we'll organize something similar we'll simply post the code in a new topic.

Weidong Li at UCBerkeley asked recently how one can use the coefficients produced by CURFIT to evaluate the fit at arbitrary points. After a quick pointer, and in what we hope will be an iraf.net tradition, he coded a solution and agreed to share it here. Thanks Weidong!

Helplog #38 -- zscale, display and autoscaling

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  • Monday, December 05 2005 @ 11:23 PM GMT
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Help Logs/Tips Question: I can't find a description of the 'zscale' scaling algorithm anywhere.Do you have a reference for how it determines the proper scaling of the pixels?

Welcome to iraf.net!

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  • Thursday, December 01 2005 @ 06:32 AM GMT
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Welcome to the new home of the IRAF user community and help desk. This site is being run as a volunteer effort of the IRAF development team with the primary goal of keeping alive the IRAF user community, and with a secondary goal of providing a needed forum for the wider astronomy software community. IRAF developers will participate in the forums that have taken over for the previous email-based helpdesk, iraf@noao.edu, but we are relying on users to participate in these forums as well. Users are also encouraged to help extend this site beyond just a helpdesk replacement, please see the Support page for how you can help.

To Post a Question:Go to the forums, select an appropriate group, and start a New Topic using the button at the top/bottom of the panel. Registered users may request an email notification once the question has been answered, otherwise replies will come exclusively through the forum.

Helplog #37 -- Using Multiple Bias Sections

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  • Monday, November 14 2005 @ 02:53 PM GMT
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Help Logs/Tips Question: I have a question concerning the colbias command in the noao.bias package of IRAF. I am working with a telescope which uses columns 1-48 and 2096-2158 as overscan regions. The bias is found by the colbias command. I was wondering if it is poissible to set up the parameters in such a way that both sections (so 1-48 and 2096-2158) are used for this purpose. Could you help me with this question?

Helplog #36 -- Measuring Ellipticities and Position Angles

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  • Monday, November 14 2005 @ 02:51 PM GMT
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Help Logs/Tips Question: I have a (long) list of x and y positions of stars in an image. I would like to measure the ellipticities and position angles of the images non-interactively. How should I do this?

Buglog #551 -- DOECSLIT

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  • Monday, November 14 2005 @ 01:41 PM GMT
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Bug Logs NUMBER: 551
MODULE: doecslit
SYSTEM: -V2.12.2
DATE: Mon Nov 14 14:56:06 MST 2005
FROM: valdes

BUG: The sparams.refit parameter is not actually used during the arc reidentification step. Instead doecslit will always attempt to refit the dispersion function. There is no workaround other than fixing the appropriate script task doecslit$sdoarcs.cl to change the refit value from yes to sparams.refit.

STATUS: Fixed for the next release.

2nd VOEvent Workshop

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  • Thursday, November 10 2005 @ 05:17 PM GMT
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VO News

The Second VOEvent Workshop is to be held in Tucson, Dec 5-6. Registration is now underway. For more information see the workshop webpage.

Helplog #35 - Using IDENTIFY in Scripts

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  • Friday, November 04 2005 @ 02:43 PM GMT
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Help Logs/Tips Question: I am writing some IRAF scripts involving the use of the task "identify". I would like to use the task interactively, as when it is launched from the command line. Everything works fine at the beginning: the task is launched and the graphical window pops up, waiting for the interactive commands. The problem is that whenever I try to mark some features using the "m" key the task does not allow me to type in the wavelength, just as if the enter key is automatically hit, so that the feature wavelength remains INDEF. ....

TABLES/STSDAS v3.4 and STSCI_PYTHON v2.2 Now Available

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  • Tuesday, November 01 2005 @ 04:48 PM GMT
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General News

The Astronomy Tools and Applications Branch of the Space Telescope Science Institute wishes to announce the availability of version 3.4 of the Space Telescope Science Data Analysis Software (STSDAS). Concurrent with the STSDAS release, we have also released v3.4 of the TABLES external package.

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