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Re: [Q] readf into an array error [message #5732 is a reply to message #5725]

Fri, 02 February 1996 00:00

peter
Messages: 80
Registered: February 1994

Member

Iarla Kilbane-Dawe (iarla@atm.ch.cam.ac.uk) wrote:

: Hello,

: why does IDL give me an error when I try to do?

: a=fltarr(10)
: i = 0
: readf,unit,a(i)

This is due to the argument passing mechanism used in IDL. If an array
is passed to a function, it is passed by reference. If a subarray is
passed, it is passed by value, and thus cannot be overwritten.

To accomplish what you want, you need to do

temp = a(i)
readf,unit,temp
a(i) = temp

It is ugly! The syntax gives no clue what is happening, and the
manual is exceptionally obscure.

Peter

--------------------------------
Peter Webb, HP Labs Medical Dept
E-Mail: peter_webb@hpl.hp.com
Phone: (415) 813-3756

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[Message index]

		[Q] readf into an array error By: Iarla Kilbane-Dawe on Fri, 02 February 1996 00:00
		Re: [Q] readf into an array error By: Ken Knighton on Fri, 02 February 1996 00:00
		Re: [Q] readf into an array error By: peter on Fri, 02 February 1996 00:00
		Re: [Q] readf into an array error By: M.W.Gardner on Fri, 02 February 1996 00:00

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