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Re: Top 10 IDL Requests [message #20692 is a reply to message #20666]

Tue, 18 July 2000 00:00

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

landsman@my-deja.com writes:
> In article <on66q4a433.fsf@cow.physics.wisc.edu>,
> craigmnet@cow.physics.wisc.edu wrote:
>
>> * A way to index strings like arrays.
>>
>> I know we can use STRMID and STRPUT, but it seems that an array-like
>> notation would fit so much better with the philosophy of IDL.
>>
>
...deletia...
>
> But I am not sure that such a change would be desirable. First of
> all would be the difficulty in making a syntax change backwards
> compatible. The change of the string syntax from V1 to V2 probably
> required more coding changes than any other syntax change ever made to
> IDL. Also, some syntax would become more complicated -- for example, the
> current extraction of elements of a string array st1 = st[3:5] would
> have to become st1 = st[*,3:5]. V5.3 introduced many string
> processing enhancements (e.g. STRMID now accepts vector parameters), so
> I think all the functionality of the array notation is now available in
> then string processing functions. Finally, one can always index strings
> like arrays by first converting them with BYTE().

I agree that standard array indexing syntax wouldn't mix too well with
accessing strings. On the other hand we do already have the
X.(SUBSCRIPT) notation for structures, which could perhaps be adapted
for strings as well.

IDL> value = '0123456789'
IDL> value.(4:5) = '--' ;; pre-beta!
IDL> print, value
0123--6789

This is intuitive to me at some level. You use the "." notation to
get at the internals of a structure. The same notation could get at
the internals of a string.

For that matter, it would be nice, but probably hard to implement, to
be able to use range and "*" notation for structures in the same way.

Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Top 10 IDL Requests By: davidf on Sun, 16 July 2000 00:00
		Re: Top 10 IDL Requests By: Harvey Rarback on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Phillip David on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: promashkin on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Liam E. Gumley on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Struan Gray on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Martin Schultz on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Bruce Bowler on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Larry Ashim on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Richard Tyc on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Richard Tyc on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: anne on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: wmc on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Luis Alonso on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Olivier ARCHER on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: hcp on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: richard hilton on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: dsreyn on Mon, 24 July 2000 00:00
		Re: Top 10 IDL Requests By: Jeff Guerber on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: robert.m.candey.1[2] on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: noymer on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: promashkin on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Eric Vella on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Michael Asten on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Michael Asten on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Michael Asten on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: promashkin on Wed, 19 July 2000 00:00
		Re: Top 10 IDL Requests By: wmc on Wed, 19 July 2000 00:00
		Re: Top 10 IDL Requests By: kashyap on Wed, 19 July 2000 00:00
		Re: Top 10 IDL Requests By: Joseph B. Gurman on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: dsreyn on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: Larry Ashim on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: kashyap on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: wmc on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: bradgom on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		LINUX Installation Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: Michael Asten on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: Kristian Kjaer on Fri, 28 July 2000 00:00
		Re: Top 10 IDL Requests By: Nicolas Decoster on Thu, 27 July 2000 00:00
		Re: Top 10 IDL Requests By: Paul van Delst on Mon, 31 July 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Mon, 31 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Sun, 30 July 2000 00:00
		Re: Top 10 IDL Requests By: Liam E. Gumley on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: Paul van Delst on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Liam E. Gumley on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Liam E. Gumley on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Michael Plonski on Tue, 01 August 2000 00:00
		Multiple Inheritance (Top 10 IDL Requests) By: Martin Schultz on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Alex Schuster on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Fardal on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Mon, 31 July 2000 00:00
		Re: Top 10 IDL Requests By: Paul van Delst on Mon, 31 July 2000 00:00
		Re: Top 10 IDL Requests By: Paul van Delst on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: Benno Puetz on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: Michael Plonski on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: promashkin on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Stephen Serjeant on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Nicolas Decoster on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Nick Bower on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Jeff Guerber on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: dominik on Mon, 07 August 2000 00:00
		Re: Top 10 IDL Requests By: ottehoman on Fri, 11 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: John-David T. Smith on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: ottehoman on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Sat, 12 August 2000 00:00
		Bottom 10 IDL requests ;-) was: Re: Top 10 IDL Requests By: wmc on Fri, 11 August 2000 00:00

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