Yes, the big differences between 0!:0 and ". on unboxed arguments are:
". returns the noun result from the execution if there is one, 0!:0
always returns $~0 0
". requires a single sentence, 0!:0 allows newlines (and so can handle
multiple sentences including :0 definitions).
Thanks,
--
Raul
Oh! Duh. I was confused. (0!:0) directly executes the string (or file).
Much clearer now. Thank you.
Raul Miller wrote:
>example=: 3 :'echo 1'
>0!:0'example'
>0!:0'example 0'
> 1
>
> Put different: when you evaluate a bare name which references a verb,
> the result of that execution
example=: 3 :'echo 1'
0!:0'example'
0!:0'example 0'
1
Put different: when you evaluate a bare name which references a verb,
the result of that execution is the named verb. You have to give the
verb an argument to execute it.
Also:
a=. 3
0!:0'a'
a
3
0!:0'a=. 4'
a
(But, al
Say we have a file ~home/script.jis with the following contents:
a=. 'bar'
and start a J session:
a=. 'foo'
verb=. 0 :0
a=. 'baz'
)
a
foo
0!:0 http://www.jsoftware.com/forums.htm
Hi,
you can start with this excellent article by Eugene McDonnell :
https://www.jsoftware.com/papers/eem/0div0a.htm
Jimmy
On Mon, May 27, 2019 at 3:16 PM Eugene Nonko wrote:
> Hello,
>
> Can someone please explain this:
>
>0 % 0
>
> 0
>
> Thanks,
> Eugene
>
In addition, to Roger's link, these are similar.
https://www.jsoftware.com/papers/zero.htm
http://www.jsoftware.com/pipermail/general/2003-January/013868.html
[the latter contains a dead link, which I think is the former]N
--
For
Eugene, funny that you should ask, because _the_ explanation can be found
in https://www.jsoftware.com/papers/eem/0div0.htm .
On Mon, May 27, 2019 at 12:16 PM Eugene Nonko wrote:
> Hello,
>
> Can someone please explain this:
>
>0 % 0
>
> 0
>
> Thanks,
> Eugene
> ---
Hello,
Can someone please explain this:
0 % 0
0
Thanks,
Eugene
--
For information about J forums see http://www.jsoftware.com/forums.htm
Subject: Re: [Jprogramming] 0 : 0 Adverb
Since you'd want to have the verb as return value, you'd want to have an
adverb or conjunction. They both need operands to do a job.
I tried this with } instead of Tacify, but I guess it will just work as
well:
> foo =: (0 :) }
>
>
No way to have a single word, since a single word is just a value and is
not executed.
And I can't find a way to do it on 2 words when one is an adverb.
Henry Rich
On 3/18/2014 8:42 AM, Pascal Jasmin wrote:
from
http://www.jsoftware.com/jwiki/PascalJasmin/Multiline%20tacit%20expressions%20wi
Since you'd want to have the verb as return value, you'd want to have an
adverb or conjunction. They both need operands to do a job.
I tried this with } instead of Tacify, but I guess it will just work as
well:
>foo =: (0 :) }
>
>0 foo
>123
>)
>(49 50 51 10{a.)}
I think this should equal
from
http://www.jsoftware.com/jwiki/PascalJasmin/Multiline%20tacit%20expressions%20with%20macros
test =: 0 : 0 Tacify
( +/
x % y 13 MACdef NB.macro that will call 13 : x % y and return %
#)
NB. blank line with comment next without comment
@:>
)
produces
+/ % #)@:>
and is
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