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Re: how to search if a variable exists in a file [message #92003 is a reply to message #92002]

Mon, 28 September 2015 16:25

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Xiaohua Pan writes:

> I am dealing with a set of stations which unfortunately contain
different variables (netcdf formate). For example, Some stations have
the variables, say 'temperature' and 'pressure', while some stations
only have 'temperature'. When I read data with DO loop the stations, I
would like to search the variable first, so I can skip those variables
not existing to avoid the crash of program. I found a function of
file_search(), but can't find a similar function for a variable. Is
there anyone know how to do it? Thanks.
>
> DO i_station = 0, n-1 do begin
> DO i_var = 0, 1 do begin
> ; How to skip the variable if it doesn't exit ????
> ENDFOR
> ENDFOR

If you were to use the netCDF programs in the Coyote Library to work
with your netCDF files, you could use the method HasVar to tell you if a
file contains a variable with a particular name:

http://www.idlcoyote.com/fileio_tips/ncdf_browser.html

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		how to search if a variable exists in a file By: Xiaohua Pan on Mon, 28 September 2015 15:25
		Re: how to search if a variable exists in a file By: David Fanning on Mon, 28 September 2015 16:25
		Re: how to search if a variable exists in a file By: Xiaohua Pan on Tue, 29 September 2015 12:05
		Re: how to search if a variable exists in a file By: Paul Van Delst[1] on Tue, 29 September 2015 08:27

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