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Re: Help: Byte-swapping program [message #3331 is a reply to message #3328]

Mon, 12 December 1994 08:04

thompson
Messages: 584
Registered: August 1991

Senior Member

grunes@news.nrl.navy.mil (Mitchell R Grunes) writes:

> In article <schaep-1212941334430001@130.60.16.90> schaep@rsl.geogr.unizh.ch (Michael E. Schaepman) writes:
>> Since we are moving our data from a VAX and a DecStation to Suns and Macs,
>> I am looking for a program, that converts big <> low-endian byte order and
>> IEEE <> VAX representation.

> In IDL or PV-Wave, the bytes of each element of array A can be swapped
> by
> BYTEORDER,A

> I think IEEE is more dificult.

The above statement is only correct if the array is short integers. For long
integers one should use the keyword /LSWAP.

I don't know about PV-Wave, but IDL does contain the options /XDRTOF and
/FTOXDR to convert between IEEE and the local host floating point
representation. Similarly, one can use /XDRTOD and /DTOXDR for double
precision.

The IDL astronomy user's library (anonymous ftp to idlastro.gsfc.nasa.gov)
routines IEEE_TO_HOST and HOST_TO_IEEE does the appropriate conversions for all
data types.

Bill Thompson

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[Message index]

		Re: Help: Byte-swapping program By: thompson on Tue, 13 December 1994 07:57
		Re: Help: Byte-swapping program By: thompson on Tue, 13 December 1994 07:50
		Re: Help: Byte-swapping program By: grunes on Mon, 12 December 1994 12:16
		Re: Help: Byte-swapping program By: plutchak on Mon, 12 December 1994 10:54
		Re: Help: Byte-swapping program By: thompson on Mon, 12 December 1994 08:04
		Re: Help: Byte-swapping program By: grunes on Mon, 12 December 1994 07:39
		Re: Help: Byte-swapping program By: grunes on Mon, 12 December 1994 07:12

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