comp.lang.idl-pvwave archive: archive » User selectable lower array bound?

Home » Public Forums » archive » User selectable lower array bound?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: User selectable lower array bound? [message #26089 is a reply to message #25981]

Fri, 03 August 2001 15:36

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

Craig Markwardt wrote:

> Which brings a gripe of my own to mind. One tricky problem with
> accessing arrays is that accessing out of bounds elements is both
> legal and illegal, depending on whether the subscript index is a
> scalar or an array.
>
> a[ [-1] ] = 0 ;; Succeeds!
> a[ -1 ] = 0 ;; Fails!
>
> What is up with that? :-)

From the manual:

>>>> >>>>>>>>>>
Using Arrays as Subscripts:
<snip>

If an element of the subscript array is less than or equal to zero, the
first element of the subscripted variable is selected. If an element of
the subscript is greater than or equal to the last subscript in the
subscripted variable (N, above), the last element is selected.
<<<<<<<<<<<<<<

Probably a user complained about having to check the bounds of their
array of indices, and RSI added this feature without thinking about the
consistency ramifications... apparently a theme of theirs.

JD

Report message to a moderator

[Message index]

		User selectable lower array bound? By: Paul van Delst on Thu, 02 August 2001 14:47
		Re: User selectable lower array bound? By: Jeff Guerber on Fri, 03 August 2001 16:11
		Re: User selectable lower array bound? By: John-David T. Smith on Fri, 03 August 2001 15:36
		Re: User selectable lower array bound? By: Craig Markwardt on Fri, 03 August 2001 15:08
		Re: User selectable lower array bound? By: Pavel A. Romashkin on Mon, 06 August 2001 09:21
		Re: User selectable lower array bound? By: thompson on Mon, 06 August 2001 07:29
		Re: User selectable lower array bound? By: Paul van Delst on Fri, 03 August 2001 09:49
		Re: User selectable lower array bound? By: Stein Vidar Hagfors H[1] on Fri, 03 August 2001 09:25
		Re: User selectable lower array bound? By: Marcus O'Brien on Fri, 03 August 2001 03:40
		Re: User selectable lower array bound? By: John-David T. Smith on Wed, 08 August 2001 12:26
		Re: User selectable lower array bound? By: Paul van Delst on Wed, 08 August 2001 08:04
		Re: User selectable lower array bound? By: Martin Schultz on Wed, 08 August 2001 04:47
		Re: User selectable lower array bound? By: Martin Schultz on Wed, 08 August 2001 04:46
		Re: User selectable lower array bound? By: marc schellens[1] on Wed, 08 August 2001 07:29
		Re: User selectable lower array bound? By: marc schellens[1] on Tue, 07 August 2001 04:36
		Re: User selectable lower array bound? By: Craig Markwardt on Tue, 07 August 2001 10:21
		Re: User selectable lower array bound? By: John-David T. Smith on Tue, 07 August 2001 08:24
		Re: User selectable lower array bound? By: bennetsc on Mon, 06 August 2001 20:26
		Re: User selectable lower array bound? By: John-David T. Smith on Mon, 06 August 2001 13:52
		Re: User selectable lower array bound? By: Paul van Delst on Mon, 06 August 2001 09:47
		Re: User selectable lower array bound? By: Paul van Delst on Mon, 06 August 2001 09:06
		Re: User selectable lower array bound? By: Paul van Delst on Thu, 09 August 2001 07:04
		Re: User selectable lower array bound? By: david[2] on Thu, 09 August 2001 06:51
		Re: User selectable lower array bound? By: Paul van Delst on Thu, 09 August 2001 06:15

Previous Topic:	IDL virtual reality (was 3D Object IDL )
Next Topic:	problem getting values from cw_bgroup normal base

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 18:38:23 PDT 2025

Total time taken to generate the page: 0.00438 seconds