there is no }::
This conjunction seems to enable a solution for most similar problems. It is
set to take verbs only, and you get to learn a lot about conjunctions and each
by practising with it. :P
amend_z_ =: 2 : 0 NB. v is n or n{"num
s=. v"_ y
(u (s{y)) (s}) y
:
s=. v"_ y
(x u (s{y)) (s}) y
)
'xyz'"_ each amend 1 each amend 1 each amend 2 'the cat' ; 'sat' ; < 'on' ;
< ('the';'mat')
A more tacit variation, that seems to always work so far:
hook =: 2 : '([: u v) : (u v) '
amendT =: 2 : ' u hook (n { ]) n} ]'
'xyz'"_ each amendT 1 each amendT 1 each amendT 2 'the cat' ; 'sat' ; <
'on' ; < ('the';'mat')
This could be expanded as the reverse (|.) of the {:: notation
----- Original Message -----
From: Sergey Kamenev <[email protected]>
To: [email protected]
Cc:
Sent: Thursday, November 13, 2014 1:28 PM
Subject: [Jprogramming] Setting arbitrary leaf of tree
I reading http://www.jsoftware.com/help/learning/32.htm
This chapter about boxed trees.
J have beatiful verb Fetch {::
This verb get any leaf by path.
I need verb for setting any selected leaf by path.
NB. Tree
] T =: 'the cat' ; 'sat' ; < 'on' ; < ('the';'mat')
ND. Get leaf by path
(2; 1; 1) {:: T
mat
How to change only one leaf in tree e.g. from "mat" to "xyz" without
re-creating the tree?
Thank you!
Sergey
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