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Last Post

programming nuancesStarted by:Sean, 09/19/2007 02:22AM
Hello,
I have been writing a procedure script
to automatically reduce some optical
data, and I have a few questions about
the iraf programming language which
don't seem to be addressed in "An
Introductory Guide to IRAF Scripts".
First of all, I have ...

4400

By: Sean

09/19/2007 02:22AM

ds9Started by:huh?, 05/15/2006 09:10PM
Hi all,

I am new to IRAF and need to do some
data reduction.

I'd like to display my images using ds9
but I don't know how to launch it.

When I type ds9 & in the cl> it
reads: no display name and no $DISPLAY
environment variable.

So how do I r...

4379

By: huh?

05/15/2006 09:10PM

Register a very large datacube ?Started by:bs_nuig, 05/29/2007 04:05PM
Hi,

I am trying to register a large data
cube; number of images(512x512) = 1000
or upwards. I have tested "xregister"
but as the help pages say, it will only
accept 1D or 2D images.. Similarly with
"imalign" ..

I could slice the data cube up using
"im...

4370

By: bs_nuig

05/29/2007 04:05PM

IRAF / IDL interaction?Started by:vall, 02/23/2007 06:01PM
Hello

Not exactly IRAF question, but
anywhere.... Does anybody know if there
is IDL procedure that can read the IRAF
spectral WCSs - multispec, etc.? I wrote
one myself but it has not been tested
extensively and I was wondering if there
is something es...

4363

By: vall

02/23/2007 06:01PM

pyraf and the apphot daophot dataprs ...Started by:wkerzendorf, 08/07/2007 07:00AM
I'm currently writing a framework to do
all my reductions with pyraf. One task
uses apphot and then daophot. This is
done over multiple files. So when the
way it is executed is apphot - daophot -
apphot -daophot ....
The first time I run apphot it use...

4359

By: fitz

08/07/2007 07:00AM

IRAF in Cygwin: imcombine problemStarted by:delta_kuadrant, 06/21/2009 02:37PM
Hello All,
I have a problem here,
whenever I execute 'imcombine' task on
iraf under cygwin, there's an error
message: ERROR: parameter 'imcmb' not
found
and image combining failed for sure
any suggestion?

regards,

PJ

4353

By: delta_kuadrant

06/21/2009 02:37PM

fixpix interpolationStarted by:figueira, 11/29/2006 02:23PM
Hello!

I'm in what has already been called here
an "iraf moment". I am trying to use
FIXPIX to interpolate a few bad pixels,
specified in a mask created by the task
CCDPROC. I can only get fixpix to
interpolate through columns. This
produces very wierd...

4348

By: fitz

11/29/2006 02:23PM

CalibrateStarted by:cosmologist, 07/21/2009 04:36PM
Hi

I got to the last step of flux
calibration for slit specta,using
"calibrate".

By default the parameter used for
sensitivity is "sens" . I am leaving it
as it is, but when I run "calibrate" it
gives me an error saying: cannot open
image (sens).

...

4345

By: valdes

07/21/2009 04:36PM

Cosmic rays and spectraStarted by:kafeen, 11/04/2007 04:22PM
Does anyone know if there's a particular
cosmic ray removal package that's really
good at removing cosmic rays from
spectra? Thanks!

4345

By: mdg

11/04/2007 04:22PM

Trimming Fits image in ds9Started by:bedosti, 06/21/2007 09:33PM
Is it possible to trim a fits image in
ds9? I have a large image and I need to
produce a new one, containing only a
part of the original.

Any help would be appreciated.
Thank you
Bedosti

4322

By: fitz

06/21/2007 09:33PM

fit1dStarted by:curiousbutton, 04/05/2006 05:17AM
Hi - I'm trying to use the
images.imfit.fit1d package to fit a
function to 1 dimension of a 2d image -
and it appears to work very well,
throwing up an irafterm displaying the
fit. The helpfile advises to 'q' out of
the irafterm and then 'return' to cr...

4314

By: curiousbutton

04/05/2006 05:17AM

setairmass and psfStarted by:patB, 10/31/2006 07:27PM
hi there, I posted a topic a couple
weeks ago with a pretty vague (sorry)
question regarding setairmass and the
psf. The subject title was "Psf and
Setairmass," so the original thread is
there. I havent got another response,
so i thought i'd create a...

4312

By: azangari

10/31/2006 07:27PM

ccfind segfaults with ZPN projectionStarted by:evert, 01/23/2008 12:07PM
I get the following segmentation fault
with ccfind when using it on an image
with a ZPN projection:

Input File: obj.coords Output File:
new.coords
Image: wcstest2.fits Wcs:
Insystem: j2000 Coordinates: equatorial
FK5
Equinox: J2000.000 Epoc...

4284

By: fitz

01/23/2008 12:07PM

timing with fxcor and rvcor (and setj...Started by:sdb_mike, 06/01/2007 04:40PM
I am doing time-series spectroscopy
measuring pulsation velocities using
fxcor. As such, our timing is incredibly
important. I have 2 issues related to
this:
The txtonly output of fxcor provides
time in HJD. However, I want JD output
because then I will...

4278

By: sdb_mike

06/01/2007 04:40PM

echelle.apnorm: PANIC in x_apextract....Started by:leon, 06/17/2009 08:12AM
I'm trying to normalize the flat under
PyRAF, but I got the following error
message:
[code:1:75b63215ee]
--> noao
--> imred
--> echelle
... ...
--> apnormalize
List of images to normalize: flat_b
List of output normalized images:
fla...

4266

By: leon

06/17/2009 08:12AM

geomap/geotranStarted by:dbrenner, 04/10/2007 07:04PM
I generate a database map.txt using
geomap. Then geotran tells me it can't
find it. ERROR(1, "Database record not
found")

4266

By: dbrenner

04/10/2007 07:04PM

Data cube co-add problemStarted by:westmoquette, 03/11/2011 05:43PM
Here's a really tricky one (I think)...

I have two IFU datacubes that I want to
co-add together. They were observed on
different months, so have different
geocentric velocities and differential
atmospheric refractions (DAR), and are
dithered by 1 integ...

4262

By: jturner

03/11/2011 05:43PM

Spectra smoothing and save it into an...Started by:delta_kuadrant, 08/05/2009 12:15AM
Dear all

I've tried to search the forum and still
not find the answer.
I want to smooth my echelle spectra and
save it into another file. what task I
should use? I've tried the 's' keystroke
on splot and use 'i' to save it into
another file. but when I...

4245

By: fitz

08/05/2009 12:15AM

about dispersion axisStarted by:valdes, 01/10/2006 06:24PM
[b:ec1587df6e]From:
[/b:ec1587df6e]"Janaka Adassuriya"
<adassuriya@accmt.ac.lk
([email]adassuriya@accmt.ac.lk[/email])>
[b:ec1587df6e]Date:
[/b:ec1587df6e]January 9, 2006 3:50:24
AM MST
[b:ec1587df6e]To: [/b:ec1587df6e]"Frank
Valdes" <valdes@no...

4234

By: valdes

01/10/2006 06:24PM

ERROR: floating point invalid operationStarted by:johannes1808, 08/06/2010 05:06PM
Hi,

I have a question about the task
craverage of the imred/crutil package.
Whenever I use the task craverage in a
script the following error occurs
sometimes:

ERROR: floating point invalid operation
cl ()

Here is an example code:

int n
for(i=17...

4222

By: fitz

08/06/2010 05:06PM

Questions about read out noise and gainStarted by:lina, 03/26/2009 07:03AM
Hi, everyone

During my work with IRAF, I find that

In Zerocombine or Flatcombine task,
there are:
(rdnoise= ) ccdclip: CCD
readout noise (electrons)
(gain = ) ccdclip: CCD
gain (electrons/DN)

But in Apall task, there a...

4210

By: valdes

03/26/2009 07:03AM

problems with esoselectStarted by:cthoene, 01/19/2009 05:55PM
Hi,

I want to do some simple pipeline for
datareduction and need to sort the files
for e.g. the filter name. In ESO data,
this is stored in the IRAF nonconform
way of using headers names with spaces
("HIERARCH ESO blabla.."). I finally
found the progra...

4201

By: fitz

01/19/2009 05:55PM

fxcor double precisionStarted by:orsola, 03/15/2007 08:12PM
I found some old e-mail advice on using
fxcor which indicated that the fxcor
within IRAF is not good enough and one
should mail Mike Fitzpatrick about
getting the double precision package. Is
this so? I have a version of fxcor in my
newly installed iraf...

4198

By: fitz

03/15/2007 08:12PM

problem with noao.twodspec.longslit....Started by:danila, 08/08/2006 10:21AM
Hello everybody!

Please help!

I reduce 2D spectral data. I have been
correcting my data for geometrical
distortions. I run identify then
reidentify and get the database files is
needed for fitcoords. At first sight,
database files generated by ide...

4176

By: danila

08/08/2006 10:21AM

fxcorStarted by:rohit, 01/04/2008 12:20AM
I am trying to find radial velocity
using FXCOR. I give it the target fits
file and the template star fits file. I
then use the command " :tempvel 34.7 "
without the quotes to give fxcor the
template star velocity. It simply does
not take that but ins...

4172

By: fitz

01/04/2008 12:20AM

Converting new type DATE-OBS to UTStarted by:tonisee, 05/14/2008 08:57AM
Hello!

In the headers of my FITS files, only
DATE-OBS keyword in the new format is
presented, it is already in UTC, e.g.:
DATE-OBS = '2008-05-14T08:57:00'

Since many tasks need keyword UT, it's
probably most easiest to write small CL
script which pars...

4153

By: tonisee

05/14/2008 08:57AM

temden task problemStarted by:Guest, 02/14/2006 04:57PM
Hello,

I have a problem with the iraf task
temden in stsdas.analysis.nebular. The
density calculation works fine but the
temperature calculation always fails
after 2 iterations, even after trying it
with carbon I, sulfur II and nitrogen
II. Typica...

4142

By: shaw

02/14/2006 04:57PM

Error in dark subtractionStarted by:Lorrie, 02/02/2006 07:21PM
I've just started learning to use IRAF
to process images. Everything was
working fine until I tried to perform a
dark subtraction with ccdproc. I got the
error message "HDMGETR: No value found"
and for the life of me I can't figure
out what's wrong. Thi...

4140

By: fitz

02/02/2006 07:21PM

DS9 command lineStarted by:ovince, 05/18/2006 06:44AM
Hi All,

I would like to lunch DS9 with 2 images
to have in the same time for analysis
using command line. Could somebody help
me with this

Thanks
Oliver

4136

By: ovince

05/18/2006 06:44AM

flux calbrate spectraStarted by:, 08/14/2008 04:56PM
Hi,

I want to flux-calibrate spectra using
noao.imred.kpnoslit package. When I look
at onedstds$README, I only see
ctioextinct.dat and kpnoextinct.dat
files available. I didn't observe at
either ctio/kpno, but my standard star
is in the onedstd$spec16...

4131

By:

08/14/2008 04:56PM

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