J dictionary section IIE should be consulted, the order of
execution is not simply from right to left, it depends on the
class of the top four elements in the execution stack.
5 ,~ 2 1 , 3 + 0
2 1 3 5
5 (,~ v2c) 2 1 (, v2c) 3 + 0
2 1 5 3
Сб, 02 авг 2014, Linda Alvord написал(а):
> Pascal, It seems to me that your three examples at the end are really are
> the starting point for J users.
>
> 5 , v2c 2 1 (, v2c) 3 + 4
> 5 6 5 7
> 5 , 2 1 3 + 4
> 5 6 5 7
>
> 5 (, v2c) 2 1 (, v2c) 3 + 4
> 9 6 5 7
> (5 , 2 1 , 3) +4
> 9 6 5 7
>
> 5 , v2c 2 1 (, v2c) 3 + 4
> 5 6 5 7
> 5 , 2 1 3 + 4
> 5 6 5 7
>
> To get the three results, understanding that functions are "read" from right
> to left, will allow you to build the desired results.
>
> What you are doing is the end of the story. So what you need now are
> examples of situations where your functions are either useful or illustrate
> a solution to a problem that would otherwise be difficult.
>
> I have found that mastering the simplest aspects of the language -
> especially parentheses - needs time and practice.
>
> I'm sure that your functions will be useful to many in this audience, but
> the trick is to "sell" them to everyone.
>
> Linda
>
> s Jasmin' via Programming
> Sent: Saturday, August 02, 2014 12:35 AM
> To: Programming Tforum
> Subject: [Jprogramming] parsing abuse, verb to conjunction
>
> this adverb returns a conjunction which is designed to turn any dyadic verb
> into a conjunction purely for parsing convenience that a conjunction can
> sometimes provide.
>
>
> lrA =: 1 : '5!:5 < ''u'''
> v2c =: 1 : ' 2 : (''m '' , u lrA , '' n'')'
>
>
> 2 1 (, v2c) 3 + 4
> 6 5 7
> appendC =. , v2c
> appendC
> 2 : 'm , n'
>
> 2 1 appendC 3 + 4
> 6 5 7
>
> if you don't put parens around the adverb and its verb argument, then it
> treats the full y as the n argument to the resulting conjunction which is
> usually not what you want since that is what the original verb would do.
> But including one of the conjunction arguments inside the parens, turns it
> into an adverb which may provide useful parsing patterns.
>
> 5 , v2c 2 1 (, v2c) 3 + 4
> 5 6 5 7
>
> 5 , (2 1 3 + 4)
> 5 6 5 7
> 5 (, v2c 2 1) (, v2c) 3 + 4
> 9 6 5 7
> 5 (, v2c) 2 1 (, v2c) 3 + 4
> 9 6 5 7
> (5 , 2 1 , 3) +4
> 9 6 5 7
>
> 5 (, v2c) 3 (2 1 , v2c) + 4
> 6 5 9 7
>
> 4 + 2 1 &, 5,3
> 6 5 9 7
>
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>
> ----------------------------------------------------------------------
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--
regards,
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