The problem with that approach is things like f=:f+1 are usually applied to a
temp variables, meaning in a local context.
IOW, normally what's wanted is f=.f+1 (not =:), of course explicit definitions
cannot manipulate the local names within other explicit definitions. This is
one reason I prefer tacit coding where I can get it.
In this case, I might take a hybrid approach, and have your modf produce a
string, which will subsequently be executed (with monad ".) in the local
context of the calling definition.
Something along these lines:
modf2=: (1 :0) (".@:)
dyad def ' ''('',x,''~)=:(".'',x,'') '' <@:(5!:6)">&.;:''u y'' '
)
Though I haven't tested (I'm on a blackberry).
-Dan
Please excuse typos; composed on a handheld device.
-----Original Message-----
From: Raul Miller <[email protected]>
Date: Wed, 21 Apr 2010 12:39:54
To: Programming forum<[email protected]>
Subject: Re: [Jprogramming] f += 1
For what it's worth, here is how to define, in J, a
word which parallels C's modified assignment
operations:
modf=:1 :0
:
(x)=:(".x)u y
)
Its use pattern is:
quotedname verb modf noun
Its meaning is:
name =: name verb noun
where name is the name which was quoted.
For example:
N=:10
'N' + modf 3
'N' * modf 2
N will have the value 26 after executing these lines.
If any of this needs explaining, please let me know.
FYI,
--
Raul
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