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Re: How to read a file in zip or gz format using IDL? [message #2620 is a reply to message #2507]

Thu, 04 August 1994 08:34

8015
Messages: 52
Registered: November 1993

Member

In article <31ocemINNbqu@maz4.sma.ch>, Tan, Jun <j.tan@rutherford.ac.uk> wrote:
>
> I am asking for help to read a file in zip or gz format using IDL. At the
> moment, I have a huge data file in ASCII format about 10 Mbytes, it thus
> takes a long time to read in all the data. I wonder it may take less time if
> the data is compressed using either zip or gzip methods. But how can I read
> such compressed file? Any advice over there is highly appreciated.
>

I'll start by assuming we're referring to IDL in a unix environment.
You can use the spawn command to manager this. Create a command string
such as:

cmd = "uncompress -c comp_file" ; comp_file is the compressed file
spawn, cmd, uncomp_file ; uncomp_file will have the uncompressed data

The -c decompresses to stdout. Also the zcat command (linked to
uncompress) will do the same thing. This way you won't have to 'rm' the
file afterwards. I'm sure gzip has the same facility and could be used
just as easily.

Mike Schienle Hughes Santa Barbara Research Center
8015@sbsun0010.sbrc.hac.com 75 Coromar Drive, M/S B28/87
Voice: (805)562-7466 Fax: (805)562-7881 Goleta, CA 93117

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[Message index]

		How to read a file in zip or gz format using IDL? By: j.tan on Wed, 03 August 1994 08:17
		Re: How to read a file in zip or gz format using IDL? By: tai on Wed, 03 August 1994 14:03
		Re: How to read a file in zip or gz format using IDL? By: 8015 on Thu, 04 August 1994 08:34
		Re: How to read a file in zip or gz format usin By: chase on Fri, 05 August 1994 08:33
		Re: How to read a file in zip or gz format using IDL? By: j.tan on Fri, 05 August 1994 05:33
		Re: How to read a file in zip or gz format usin By: oet on Thu, 04 August 1994 21:42

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