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Re: BYTES to LONG [message #22419 is a reply to message #22341]

Wed, 08 November 2000 00:00

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Kelly Dean <krdean@lamar.colostate.edu> writes:

> Thanks Paul,
>
> Your suggestion solved my problem.
>
> long_x = TOTAL( ISHFT( LONG(x), [24,16,8,0] ) )

Hi Kelly--

While this may seem to work, I agree with JD that this is a bit
dangerous since it converts to floating point. The expression

long_x = long(x, 0, 1)

should produce the same, and correct, result, without invoking any
floating point conversions. However you may have to worry about
so-called "endian" issues, that is byte ordering differences between
machines. A routine in the IDL Astronomy Library like IEEE_TO_HOST
should be able to help you there.

Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		BYTES to LONG By: Kelly Dean on Tue, 07 November 2000 00:00
		Re: BYTES to LONG By: Kelly Dean on Thu, 09 November 2000 00:00
		Re: BYTES to LONG By: Kelly Dean on Thu, 09 November 2000 00:00
		Re: BYTES to LONG By: Craig Markwardt on Wed, 08 November 2000 00:00

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