Based on what Henry says, this means J cannot distinguish between:
var=. i.3
'var' -: v var
and
'var' -: v i.3
If you are willing to live with false positives, you could do something
ridiculous like this:
nl 0
+-------+-----+------------+----+------+
|BASEDSK|DBGFL|DEBUGSTARTUP|IFJ6|ISWIN7|
+-------+-----+------------+----+------+
var=. i.3
(".&.>nl 0) i. <var
5
#nl 0
6
nl 0
+-------+-----+------------+----+------+---+
|BASEDSK|DBGFL|DEBUGSTARTUP|IFJ6|ISWIN7|var|
+-------+-----+------------+----+------+---+
So,
v=: 13 : 'x{~(".&.>x) i. <y'
(nl 0) v var
+---+
|var|
+---+
On Fri, May 3, 2019 at 8:30 AM Henry Rich <[email protected]> wrote:
> A noun is replaced by its value before the sentence is executed.
>
> Henry Rich
>
> On 5/3/2019 8:28 AM, Piet de Jong wrote:
> > (This probably shows my ignorance,) but if y is a variable then y points
> to some values. I’d like to know “the pointer” rather than "the values”.
> I very/extremely vaguely understand these things work on stacks with the
> y values loaded on a stack before v gets to act on them. That is why
> perhaps I thought it could be an adverb or conjunction: a counterpart to
> “evoke” ~.
> >
> >> On 3 May 2019, at 10:09 pm, Henry Rich <[email protected]> wrote:
> >>
> >> Impossible - v never sees y, only its value.
> >>
> >> Henry Rich
> >>
> >> On 5/3/2019 6:58 AM, Piet de Jong wrote:
> >>> If m is the name (ie string) of a variable then ‘m'~ is the value of
> the variable.
> >>>
> >>> Is there an “inverse" to this?
> >>>
> >>> That is I want a verb v (or adverb or conjunction) so that if y is a
> variable then
> >>>
> >>> v y
> >>>
> >>> is the name (ie string) of the variable.
> >>>
> >>>
> >>>
> >>>
> >>> ----------------------------------------------------------------------
> >>> For information about J forums see http://www.jsoftware.com/forums.htm
> >>
> >> ---
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> >> https://www.avg.com
> >>
> >> ----------------------------------------------------------------------
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> > ----------------------------------------------------------------------
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>
> ----------------------------------------------------------------------
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>
--
Devon McCormick, CFA
Quantitative Consultant
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
