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Re: Reading non-standard variable sizes [message #81397 is a reply to message #81393]

Fri, 07 September 2012 14:23

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 9/7/12 2:44 PM, Brian J. Daniel wrote:
> I'm attempting to read values from a binary file with some strange variable formats. Specifically, I have a field of data that uses 9 bytes. No IDL data format has 9 bytes. I can do the following:
>
> data = bytarr(9)
> ReadU, lun, data
>
> And lun will be ready to read the next variable, but how do I convert the 9 byte variable into a single 8-byte double number?
>
> Unfortunately, I can't change the format of this data because its a standard. Thanks for your interest.
>
> -Brian
>

Check out the DOUBLE function. I think you want something like:

d = double(data, 0)

or

d = double(data, 1)

depending on which 8 bytes of the 9 bytes are used.

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
Research Mathematician
Tech-X Corporation

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[Message index]

		Re: Reading non-standard variable sizes By: Brian Daniel on Mon, 10 September 2012 11:56
		Re: Reading non-standard variable sizes By: Craig Markwardt on Fri, 07 September 2012 20:49
		Re: Reading non-standard variable sizes By: Michael Galloy on Fri, 07 September 2012 14:23

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