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Re: Reading non-standard variable sizes [message #81393 is a reply to message #81372]

Fri, 07 September 2012 20:49

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Friday, September 7, 2012 5:23:15 PM UTC-4, Mike Galloy wrote:
> 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)
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>> ReadU, lun, data
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>>
>
>> 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?
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>>
>
>> Unfortunately, I can't change the format of this data because its a standard. Thanks for your interest.
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>>
>
>> -Brian
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>>
>
>
>
> Check out the DOUBLE function. I think you want something like:
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>
>
> d = double(data, 0)
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>
>
> or
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> d = double(data, 1)
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>
>
> depending on which 8 bytes of the 9 bytes are used.
...

And then pray to gods of endianness. A sacrifice at the altar of SWAP_ENDIAN may allow you to receive your wish.

Craig

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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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