[Jprogramming] sparse scatter-modify

[Hauke Rehr]

Very interesting indeed.

Output of
1 I } 8 8 $ 0
differs from 8.07 to 9.01
(8.07: all ones) but
1 I } 1 $. 8 8 ; 0 1 ; 0
is the same.

Am 02.12.20 um 01:16 schrieb David Lambert:
> matrix representation of a graph failure
> ( https://adventofcode.com/2019/day/6 )
> 
>    JVERSION
> Engine: j901/j64avx2/windows
> Release-c: commercial/2020-01-11T13:29:14
> Library: 9.01.22
> Platform: Win 64
> Installer: J901 install
> InstallPath: c:/program files/j901
> Contact: www.jsoftware.com
> 
>    I=:_2]\0 1 2 3 4 5 6 7 1 0 3 2 5 4 7 6
> 
>    1 I } 8 8 $ 0
> 0 1 0 0 0 0 0 0
> 1 0 0 0 0 0 0 0
> 0 0 0 1 0 0 0 0
> 0 0 1 0 0 0 0 0
> 0 0 0 0 0 1 0 0
> 0 0 0 0 1 0 0 0
> 0 0 0 0 0 0 0 1
> 0 0 0 0 0 0 1 0
> 
>    1 I } 1 $. 8 8 ; 0 1 ; 0
> 0 0 | 1
> 0 1 | 1
> 0 2 | 1
> (snip)
> 7 3 | 1
> 7 4 | 1
> 7 5 | 1
> 7 6 | 1
> 7 7 | 1
> 
> Stay well!  Dave
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
> 

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