| Re: read data from several files [message #37207 is a reply to message #37206] |
Wed, 26 November 2003 07:58  |
tschulze
Messages: 3
Registered: November 2003
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Junior Member |
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"dennis" <am_indian@nospam.hotmail.com> wrote in message news:<KPicnZQIhpleoVmiXTWc-g@speakeasy.net>...
> Hi,
>
> New to using IDL and I am plotting and comparing magnitudes of stars over
> several days.
>
> For each image there is a photometry file created with data for stars
> located.
>
> Can anyone suggest how to have IDL read from several files and extract only
> data necessary and then plot this data that it extracts?
>
> For examply, in four seperate files (text files) each file has 8 columns and
> 300 lines. In the first file, the star is in the 67th line and the
> magnitudes are in the 6th and 7th column (the columns will always be the
> same). In the next file the star (same star) is in the 169th line...the star
> could be in any line, but I want to match up the magnitudes of 6th and 7th
> columns (columns for that data are always in 6th and 7th column). I want to
> have IDL grab only data for that star in each of the four files, do some
> calculation with it and plot it and then go to another star and doing the
> same thing. The star location in the file is random, but the columns of that
> info remain the same.
>
> I assume that I will have to search for string match for the star names in
> each file and then do 'readcol', but that is all I know.
>
> Any help would be appreciated.
>
> Thanks,
>
> Dennis Lamenti
Hi Dennis,
unfortunately i did not understand with what kind of information you
can identify the star. Is it only the 6th and 7th column that remain
the same? Are there more pieces of information? What kind of
information about the star do you have before opening the files?
Thomas
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