Note also that this would have worked:
DEG2=: lenx }. DEG
DEG=: lenx {. DEG
FYI,
--
Raul
On Fri, Mar 19, 2021 at 4:22 AM Julian Fondren <[email protected]> wrote:
>
> On 2021-03-19 02:48, HH PackRat wrote:
> > [leny1 is the length of the DEG table and lenx1 is the length of the
> > table to match DEG with]
> >
> > xydiff=. leny1 - lenx1 NB. length leny1 must always be longer than
> > lenx1
> >
> > DEG2=. _xydiff {. DEG NB. save unmatched tail portion of DEG
> >
> > DEG=. _xydiff }. DEG NB. delete unmatched tail portion of DEG
> >
> > Since it seems (and I may be mistaken in some way) that J cannot
> > handle the value of a noun variable, how can I accomplish what I'm
> > trying to do in the above code?
>
> The error you get is 'ill-formed number' on _xydiff
>
> ;: '_3 -3'
> ┌──┬─┬─┐
> │_3│-│3│
> └──┴─┴─┘
> _3
> _3
> -3
> _3
> [n=:3
> 3
> -n
> _3
> _n
> |ill-formed number
> | _n
> | ^
>
> _ is part of the notation for writing numbers, and isn't an
> operator. You can get the result you want with -
>
> [DEG=:i.4 3
> 0 1 2
> 3 4 5
> 6 7 8
> 9 10 11
> [other=:i.3 3
> 0 1 2
> 3 4 5
> 6 7 8
> [diff=:(#DEG) - #other
> 1
> [DEG2=: (-diff) {. DEG
> 9 10 11
> [DEG=: (-diff) }. DEG
> 0 1 2
> 3 4 5
> 6 7 8
> ----------------------------------------------------------------------
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----------------------------------------------------------------------
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