This was a breaking change in APL2 (previously 1 2 3[2] was valid and
returned 2) but I think it was the right decision for a language with
stranding. It means that A[1] B[2] parses as (A[1])(B[2]) which seems sane.
The alternative (ISO, Dyalog) is that A[1] B[2] parses as (A[1] B)[2],
which is pr
Hi Xiao-Yong,
I know, there are a few differences between APL2 and the ISO
standard. In such cases
APL2 rules because a standard which is not implemented is less
useful than an implementation
of it.
/// Jürgen
not even 3[1] is good of even (3)[1]it has to be (,3)l1]it has
to be an ARRAY so the index can work
if this behavior is changed to do what apl2 has then this is no longer apl -
remember apl goes right to left
On Wed, 15 Feb 2017 14:44:18 -0600
Xiao-Yong Jin wrote:
> ISO/IE
ISO/IEC 13751:2000(E) disagrees.
On page 158, section 10.2.14 Indexed Reference,
there is an example
1 2 3[2]
2
> On Feb 15, 2017, at 2:22 PM, Juergen Sauermann
> wrote:
>
> Hi Xiao-Yong,
>
> IBM APL2.
>
> [] binds stronger than anything else.
>
> Thus 3[1 2] is evaluated first, giving
Hi Xiao-Yong,
IBM APL2.
[]
binds stronger than anything else.
Thus 3[1 2]
is evaluated first, giving the RANK ERROR.
/// Jürgen
On 02/15/2017 09:14 PM, Xiao-Yong Jin
wrote:
Feature or bu
you are really trying to takeindex of just 3 with 3[2 1 3]hence the
need for the ( )
On Wed, 15 Feb 2017 14:14:21 -0600
Xiao-Yong Jin wrote:
> Feature or bug?
>
> 1 2 3[2 1 3]
> RANK ERROR
> 1 2 3[2 1 3]
> ^^
> )sic
> (1 2 3)[2 1 3]
> 2 1 3
>
>
Feature or bug?
1 2 3[2 1 3]
RANK ERROR
1 2 3[2 1 3]
^^
)sic
(1 2 3)[2 1 3]
2 1 3
