[Jprogramming] J weirdness 0

['Jon Hough' via Programming]

I'm no J guru, but

instead of
NP 1 $ 1

you should probably do
(NP, 1) $ 1


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On Sat, 4/15/17, Michael Goodrich <michael.goodrich at gmail.com> wrote:

 Subject: [Jprogramming] J weirdness 0
 To: programming at jsoftware.com
 Date: Saturday, April 15, 2017, 10:41 PM
 
 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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