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Re: how to handle 3-D data [message #3376 is a reply to message #3373]

Wed, 18 January 1995 02:20

Fergus Gallagher
Messages: 41
Registered: January 1995

Member

surinder@eng.umd.edu (Surinder P. Singh) wrote:
>
> I get data out put from
> FORTRAN 77, a function
> F(i,j,k) .
>
> What is the best way to write this data and read by idl ?
> Can i increse speed of reading and writing by unformatted data ?
>

Yes - unformatted reading & writing is MUCH faster.
If you're on unix, remember to use the /F77_UNFORMATTED keyword (F77
records have extra longwords at both ends.

In F77 you can write

open(unit,"data.dat",form="unformatted",....)
write(unit) F

and read with

openr,unit,/get_lun,/f77_unformatted
a = fltarr(100,100,100) ; for example
readu,unit,a
free_lin,unit

See IDL UG, 17-44 ff

Fergus

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[Message index]

		Re: how to handle 3-D data By: n9140397 on Wed, 18 January 1995 10:23
		Re: how to handle 3-D data By: Fergus Gallagher on Wed, 18 January 1995 02:20
		Re: how to handle 3-D data By: thompson on Thu, 26 January 1995 11:13

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