APL - Value assignnment in parenthesis (was Re: Indexing into each element of a nested vect

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Value assignnment in parenthesis (was Re: Indexing into each element of a nested vect

Roland Besserer

2004-06-19, 8:55 pm

In article <0001HW.BCF61FCF00F370CFF03055B0@news.prodigy.net>, James L.
Ryan <taliesinsoft@mac.com> wrote:

> On Wed, 16 Jun 2004 14:43:43 -0500, James J. Weinkam wrote
> (in article <caq7st$pso$1@morgoth.sfu.ca> ):
>
>
> What I intended to say was that for the expression sequence
>
> X is 5
> (X is 10) + X
>
> IBM APL at one time returned 20 and later was changed to return 15.
>

I can confirm that the APL on the IBM 5100 and even APL.68000 on an
Ampere WS-1 return while all the recent APLs I have (including APLX,
for example) retrun 15.

Strnage that I've never even realized that the 'old' behavior is an
unnecessary excemption to the right-to-left parsing rule. Oh well.

roland

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