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From: | Elias Mårtenson |
Subject: | Re: Unexpected result with inner product |
Date: | Wed, 26 Jan 2022 12:40:09 +0800 |
On NARS2000.64 it gives:
⎕fmt (A≠0) +.Q B
┌2───────┐
3┌0─┐┌0─┐│
││ 0││ 0││
│└~─┘└~─┘│
│ │
│┌0─┐┌0─┐│
││ 0││ 0││
│└~─┘└~─┘│
│ │
│┌0─┐┌0─┐│
││ 0││ 0││
│└~─┘└~─┘2
└∊───────┘
so, the same thing as gnu-apl
Xtian.
On 2022-01-25 23:25, Elias Mårtenson wrote:
> Consider the following code:
> *
> *
> * A←3 4⍴1 3 2 0 2 1 0 1 4 0 0 2
> B←4 2⍴4 1 0 3 0 2 2 0
> Q←{⍺/⍵}
> (A≠0) +.Q B*
>
> My reading (and implementation) of the ISO spec suggests the output should be the following:
>
> ┏━━━┓
> ┃4 6┃
> ┃6 4┃
> ┃6 1┃
> ┗━━━┛
>
> However, in GNU APL I get this:
>
> ┏→━━━━━━┓
> ↓┏⊖┓ ┏⊖┓┃
> ┃┃0┃ ┃0┃┃
> ┃┗━┛ ┗━┛┃
> ┃┏⊖┓ ┏⊖┓┃
> ┃┃0┃ ┃0┃┃
> ┃┗━┛ ┗━┛┃
> ┃┏⊖┓ ┏⊖┓┃
> ┃┃0┃ ┃0┃┃
> ┃┗━┛ ┗━┛┃
> ┗∊━━━━━━┛
>
> Which one is correct?
>
> Regards,
> Elias
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