> Why will it not accept NP in the place of the numeric literal 50?
"50 1" and "NP 1" are parsed differently:
;: '50 1'
+----+
|50 1|
+----+
;: 'NP 1'
+--+-+
|NP|1|
+--+-+
There is no rule for executing the noun noun pair in the second example, so
you need the alternatives already suggested. See the Dictionary for more
info.
On Sat, Apr 15, 2017 at 6:41 AM, Michael Goodrich <
michael.goodr...@gmail.com> wrote:
> OK J gurus, I fail to understand what appears to be an irregularity in J:
>
>
> X =. readtable 'X.txt'
> shpX =. $X
> dimX =. #shpX
> NP =. >{shpX
> Ones =. NP 1 $ 1
> |syntax error
>
> readtable => as defined in the primer
> X.txt a column of 50 numbers one on each line
>
> the idea here is to determine how many numbers are in X which is what NP is
> set to. J appears to agree with me that NP is the proper number (and is
> indeed a number) since:
>
> NP
> 50
> NP+1
> 51
>
>
> And J is happy if do:
>
> Ones0 =. 50 1 $ 1
>
> Why will it not accept NP in the place of the numeric literal 50???????
>
> I await your wisdom ...
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