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Re: Unsigned Integers - How? [message #8120 is a reply to message #8115]

Fri, 07 February 1997 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

David Foster wrote:
>> David Fanning wrote:
>>
>> Read the unsinged integers into *signed* 16-bit integers in IDL.
>> (You are already doing this, apparently).
>>
>> date = 0L
>> time = 0L
>> READU, lun, datafile, date, time
>>
>> Convert them to the correct *unsigned* values, like this:
>>
>> date = LONG(date) AND 'FFFF'x
>> time = LONG(time) AND 'FFFF'x
>>
>
> Oops! If you specify LONG then you get 32-bit integers. So:
>
> date = fix(0)
> time = fix(0)
> readu, lun, datafile, date, time
>
> date = date AND 'FFFF'x
> time = time AND 'FFFF'x
>

Double oops! Low voltage day or what!! Sorry about this noise.
I just meant that you need 16-bit integers when you read the
integers from the file (I'm assuming we're talking about shorts).
Of course, the last two lines should read:

date = long(date) AND 'FFFF'x
time = long(time) AND 'FFFF'x

as David Fanning suggested.

Sorry Dave.

--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2200
La Jolla, CA 92037
[ UCSD Mail Code 0949 ]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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[Message index]

		Re: Unsigned Integers - How? By: Peter Berdeklis on Fri, 07 February 1997 00:00
		Re: Unsigned Integers - How? By: davidf on Fri, 07 February 1997 00:00
		Re: Unsigned Integers - How? By: David Foster on Fri, 07 February 1997 00:00
		Re: Unsigned Integers - How? By: David Foster on Fri, 07 February 1997 00:00
		Re: Unsigned Integers - How? By: davidf on Fri, 07 February 1997 00:00

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