5 +:^:(<@{:`{.)@, 3
5 10 20
The particular difficulty in this case is that
one of the arguments of the conjunction (^:)
has to be be an argument of the overall verb.
For that you need one of the forms
u^:(f`g) or u^:(f`g`h)
----- Original Message -----
From: Lippu Esa <[email protected]>
Date: Monday, April 13, 2009 7:42
Subject: [Jprogramming] How to make a tacit dyadic verb with the power
conjuction?
To: Programming forum <[email protected]>
> Hi!
>
> I have been using tacit programming for some time. It is not unusual
> that
> difficulties arise due to my shallow understanding of the J language.
>
> The current problem can be demonstrated with a simple example:
>
> I want a doubling function that takes two parameters. The first
> one is
> the number to be doubled and the
> other one tells how many times. Like:
>
> +:^: (<3) 5
> 5 10 20
>
> How can I do it tacitly, i.e.: 5 multidbl 3 should give the same
> result?
> The problem appeared when I finally began to program my own life :)
> inspired by this demonstration and FinnAPL Tallinn conference in
> Estoniastarting on Wednesday (and yes, there are three J-related
> presentations,all by our Estonian friends).
>
> www.youtube.com/watch?v=a9xAKttWgP4
>
> I actually got this generation function working somehow but it annoyed
> me that I couldn't give the nouns in the same order as in the
> presentation, life matrix on the left side and generation count
> on the
> other. This one was ok:
>
> gen=.life^:[]
> 3 gen R
>
> I tried to understand the problem by writing a much simpler
> function but
> didn't get it working tacitly at all. I also tried to find some
> information from the documentation but didn't recognize any. It
> would be
> nice to get my own life working before looking for better life
> :) .
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