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How to add several *.fit files (matrices) into one output *.fit file? [message #63325]

Thu, 06 November 2008 07:20

Griffons
Messages: 15
Registered: November 2008

Junior Member

Hello Everyone,

Anyone would know how to add several *.fit files (matrices) into one
output *.fit file using IDL?

Thank you.

Griffons

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Re: How to add several *.fit files (matrices) into one output *.fit file? [message #63386 is a reply to message #63325]

Thu, 06 November 2008 13:40

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

"Paolo" <pgrigis@gmail.com> wrote in message
news:0c8e6af6-73c6-43a7-9c20-304c73d763fb@l33g2000pri.google groups.com...
...
> Normally I use something as
> file=dir+filename
> such that when I need to move the files somewhere else
> I only need to change the dir in one place.

Along those lines, a get_thisdatapath()
routine can be very helpful. Especially as it grows,
one can add keywords to leave previous behaviour untouched,
while adding new behaviours (such as reading new versions of the
same dataset, or adding new fields).

(where "thisdata" describes a particular dataset)

Cheers,
bob

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Re: How to add several *.fit files (matrices) into one output *.fit file? [message #63396 is a reply to message #63325]

Thu, 06 November 2008 11:50

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

"Griffons" <griffons76@gmail.com> wrote in message
news:dd8c46c9-8ac9-435f-8822-b549d7ba118a@d10g2000pra.google groups.com...
...
> IDL> files=['S_08189493.fit','S_08189494.fit','S_08189495.fit',
> 'S_08189496.fit'] ;
> IDL> sum = READFITS( files[0], /NOSCALE)
> READFITS: ERROR - Unable to locate file S_08189493.fit

well, if you don't know where your files are, how is
IDL supposed to know?

This means that the file is not in your current directory.
Include the full path for the file, and it should work.

Cheers,
bob

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Re: How to add several *.fit files (matrices) into one output *.fit file? [message #63409 is a reply to message #63325]

Thu, 06 November 2008 09:53

Christopher Thom
Messages: 66
Registered: October 2006

Member

Quoth Wox:

> On Thu, 6 Nov 2008 09:14:30 -0800 (PST), Griffons
> <griffons76@gmail.com> wrote:
>
>> I downloaded readfits, writefits and the other files required.
>> I am not sure what to do next. I compiled and ran readfits and
>> writefits, but then what to do?
>
> files=['test1.fits','test2.fits',...] ; use e.g. file_search for this
> sum = READFITS( files[0], /NOSCALE)
> for i=1,n_elements(files)-1 do $
> sum += READFITS( files[i], /NOSCALE)
> writefits, 'sum_filename', sum
>
> Both readfits and writefits depend on some other procedures from the
> ASTRO library. Make sure you compiled them too.

And a minor point to add...be clear that you really want to specify the
/NOSCALE option. If the fits images have BSCALE and BZERO set in the
header, then you may want them scaled appropriately before summing...

cheers
chris

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Re: How to add several *.fit files (matrices) into one output *.fit file? [message #63515 is a reply to message #63386]

Fri, 07 November 2008 05:44

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

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Hash: SHA1

R.G. Stockwell schrieb:
> "Paolo" <pgrigis@gmail.com> wrote in message
> news:0c8e6af6-73c6-43a7-9c20-304c73d763fb@l33g2000pri.google groups.com...
> ...
>> Normally I use something as
>> file=dir+filename
>> such that when I need to move the files somewhere else
>> I only need to change the dir in one place.
>
> Along those lines, a get_thisdatapath()
> routine can be very helpful. Especially as it grows,
> one can add keywords to leave previous behaviour untouched,
> while adding new behaviours (such as reading new versions of the
> same dataset, or adding new fields).
>
> (where "thisdata" describes a particular dataset)
>
> Cheers,
> bob
>
>
>
>

or u set an env var pointing to the data dir or it's base dir. Sometimes
that is then easier to adjust in different environments.

cheers
Reimar

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