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Re: very very strange thing is happening with modfits...... [message #93466 is a reply to message #93464]

Fri, 22 July 2016 11:01

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Friday, July 22, 2016 at 11:30:12 AM UTC-4, Sapna Mishra wrote:
> On Friday, July 22, 2016 at 8:30:03 PM UTC+5:30, wlandsman wrote:
>> On Friday, July 22, 2016 at 1:15:26 AM UTC-4, Sapna Mishra wrote:
>>> ..etc.
>>> But after modifying it to a fits file stored in variable:fname(n_elements(fname)-1)
>>> I got very different values: 2.26270e+28,-5.91691e-11.......with message:
>>
>> I don't know what is happening -- it works for me.
>>
>> But why don't you just write a new FITS file (using mwrfits.pro) instead of using modfits.pro? It is likely faster (and certainly less complicated) to write a complete new FITS file, rather than modify bits and pieces of an existing file.
>
> Actually what I want is that my fits file contains data and header in three extentions e.g. 0,1,2(h0,h1,h2) using mwrfits create a complete new files with a
> certain extention. What If i want to recover values of all other two extensions?
> Creating a new fits file with same name will do so???

If I am modifying an existing FITS file I typically use the FXBOPEN, FXBWRITE, FXBCLOSE family of functions. They are documented on the IDL Astronomy Library site.

extnum = 1
fxbopen, unit, 'myfile.fits', extnum, hh, access='RW'
fxbwrite, unit, aa.flux, 'FLUX', 1
fxbfinish, unit

Done.

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[Message index]

		very very strange thing is happening with modfits...... By: Sapna Mishra on Thu, 21 July 2016 22:15
		Re: very very strange thing is happening with modfits...... By: wlandsman on Fri, 22 July 2016 07:59
		Re: very very strange thing is happening with modfits...... By: Sapna Mishra on Fri, 22 July 2016 08:30
		Re: very very strange thing is happening with modfits...... By: Craig Markwardt on Fri, 22 July 2016 11:01
		Re: very very strange thing is happening with modfits...... By: Sapna Mishra on Fri, 22 July 2016 08:31

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