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Re: renaming a variable without making a copy [message #69158 is a reply to message #68935]

Fri, 11 December 2009 05:22

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

On 11 déc, 12:51, Reimar Bauer <R.Ba...@fz-juelich.de> wrote:

> what is that doing then?

> IDL> a=bindgen(3)
> IDL> b=ptr_new({s:intarr(3)})
> IDL> reads,a,*b
> IDL> print,*b
> { 0 1 2

Still the same: 'a' is implicitely converted to some string array by
'reads', then read out to *b.
Look at the following:

define some structure:
IDL> a={n:1L,x:2.0}

build its binary content as a byte chain:
IDL> b=[byte(a.n,0,4),byte(a.x,0,4)]
IDL> print,b
1 0 0 0 0 0 0 64

define a void structure to get the result:
IDL> aa={n:0L,x:0.0}

then :
IDL> reads,b,aa
IDL> print,aa
{ 1 0.000000}
does not provide the right result.

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[Message index]

		renaming a variable without making a copy By: David Higgins on Tue, 08 December 2009 03:51
		Re: renaming a variable without making a copy By: lecacheux.alain on Thu, 10 December 2009 08:56
		Re: renaming a variable without making a copy By: R.Bauer on Fri, 11 December 2009 03:51
		Re: renaming a variable without making a copy By: lecacheux.alain on Thu, 10 December 2009 08:30
		Re: renaming a variable without making a copy By: R.Bauer on Thu, 10 December 2009 07:36
		Re: renaming a variable without making a copy By: lecacheux.alain on Thu, 10 December 2009 02:31
		Re: renaming a variable without making a copy By: penteado on Fri, 11 December 2009 08:38
		Re: renaming a variable without making a copy By: lecacheux.alain on Fri, 11 December 2009 05:22

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