I hope this is easier to read.
az=:'abcdefghijklmnopqrstuvwxyz'
i=:3 2 5 8 5 3
(;i{.&.>1) <;.1 az
┌───┬──┬─────┬────────┬─────┬───┐
│abc│de│fghij│klmnopqr│stuvw│xyz│
└───┴──┴─────┴────────┴─────┴───┘
]c=:i{.&.>1
d=:<(>i){.>1
c-:d
0
e=:<(>"0 i){.>1
c-:e
0
f=:<"0(>"0){.>1
c-:f
0
g=:<"0(>"0){.(>"0) 1
c-:g
0
Vocabulary: x u&.v y ↔ vi (v x) u except that the verb obverse to v is
applied to the result for each cell.
How do you apply the definition in this case?
Linda
-----Original Message-----
From: [email protected] [mailto:programming-
[email protected]] On Behalf Of Roger Hui
Sent: Wednesday, October 10, 2012 12:36 AM
To: [email protected]
Subject: Re: [Jprogramming] Partitioning a string into unequal-length parts
The design of *cut* comes from section K of *Rationalized
APL*<http://www.jsoftware.com/papers/RationalizedAPL.htm>,
written by Ken Iverson in 1983 at the height of his powers. In the
original publication the description of *cut* was split with half on one
page and the other half on the obverse. In order to understand it, I
finally had to photocopy the two halves and paste them together onto a
single page, and studied the single page.
On Tue, Oct 9, 2012 at 8:43 PM, Ian Clark <[email protected]> wrote:
> Thank you everybody. That's turned the hay over in my mind.
>
> I really ought to know my standard J manuals better...
> The very first example of Phr: 5B. Partition
> http://jsoftware.com/help/phrases/partition.htm
> -essentially answers my question.
> Left argument to Cut (;.) -- a blind spot for me.
>
> On Tue, Oct 9, 2012 at 3:32 PM, Ian Clark <[email protected]> wrote:
> > 1. Suppose:
> > az=: 'abcdefghijklmnopqrstuvwxyz'
> > i=: 3 2 5 8 5 3 NB. -(for example)
> >
> > How best can I partition az into parts pp where (n{pp) has length (n{i)
?
> > viz.
> > pp -: 'abc';'de';'fghij';'klmnopqr';'stuvw';'xyz'
> >
> > 2. Suppose instead of (i) I have a boolean (b) marking where to cut
> > az
> ...
> > b =: 0 0 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 (c/f
> > dyadic {enclose} in APL+)
> ----------------------------------------------------------------------
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>
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