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Re: V6.0 indexing change [message #36189 is a reply to message #36188]

Tue, 12 August 2003 16:04

andrew.cool
Messages: 47
Registered: July 2003

Member

Wayne Landsman <landsman@mpb.gsfc.nasa.gov> wrote in message news:<3F39035C.8070409@mpb.gsfc.nasa.gov>...
> I haven't installed V6.0 yet myself but I have been informed by Mike
> Corcoran of a change that can break some existing code.
>
> Formerly, if one had a structure, say a = {x:indgen(10)} which was
> accessed by a 1 element vector, say i = [3], then the result a.x[i]
> would be a scalar. In V6.0, however, the result is now a 1 element
> vector.
>
> I have to say that the V6.0 method makes more more sense -- subscripting
> with a 1 element vector should return a 1 element vector. But it can
> break existing code because logical tests such as
>
> if a.x[i] EQ 3 then stop
>
> will no longer work. The fix is simple enough ( set i = i[0] first )
> but users might want to fix the code before upgrading to V6.0.
>
> --Wayne Landsman landsman@mpb.gsfc.nasa.gov

Wayne,

You sure about this? Yes, a 1 element vector is now returned, but
your example

if a.x[i] EQ 3 then stop

works just fine for me under the 6.0 Beta (Win2000), as does

if a.x[i[0]] EQ 3 then stop

Andrew
DSTO, Adelaide, South Australia

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[Message index]

		Re: V6.0 indexing change By: R.Bauer on Wed, 13 August 2003 23:20
		Re: V6.0 indexing change By: news.verizon.net on Tue, 12 August 2003 18:51
		Re: V6.0 indexing change By: Mark Hadfield on Tue, 12 August 2003 17:45
		Re: V6.0 indexing change By: andrew.cool on Tue, 12 August 2003 16:04

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