Hello Jeff;
Are you thinking the '' is ", i.e. the two single quotes is a double
quote. That is quite understandable; those cases are hard to
distinguish. If the single quotes were a double, I think the sentence
would be a verb result as a session extract shows:
(3 : 'y,y')"
┌─────────┬─┐
│┌─┬─┬───┐│"│
││3│:│y,y││ │
│└─┴─┴───┘│ │
└─────────┴─┘
Perhaps the sentiment is that inlined subexpressions are so obvious,
that it needs no documentation:
a =: 2 * 3
b =: a + 4
NB. ...is the same as:
b =: (2 * 3) + 4
It would make sense to show this in tutorial material, although I'm sure
some would say it is too obvious even there.
Jeff.Mosmann wrote:
Bill,
Thanks for your very quick response.
I had managed to work through the 'anonymous verb' idea through
experimentation. I am still not clear, though, how the syntax used in
jijs.ijs works, as in
3 : 0''
if. 0: ~: 4!:0 <'IFJIJX_j_' do. IFJIJX_j_=: 0 end.
)
where the '' seems to me to be syntactically in error. Or is this a
'special case'? It would be welcome if the documentation could cover this,
as there are clearly real uses in the loading of scripts, as in the above
example.
As for 0!:100, it was definitely a case of not my reading the existing
documentation effectively enough!
Regards, Jeff
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of bill lam
Sent: 17 July 2008 10:46
To: Programming forum
Subject: Re: [Jprogramming] Documentation sought
Jeff.Mosmann wrote:
I have been trying to find documentation on two items, without success.
The first item concerns the use of the following form of explicit
definition
to elicit immediate execution of a (possibly non-assigned) verb on loading
a
script, as found in jijs.ijs:
3 : 0''
...
)
This may be passed only by oral tradition, the verb is anonymous, cf. this
should be more obvious,
(3 : 'y,y') 'abc'
abcabc
The second item concerns the foreign conjunctions 0!:100 and 0!:101, also
found in jijs.ijs.
in .... /j602/help/dictionary/dx000.htm
Scripts 0!:
0!:k y The script y is executed according to the digits (zero or one) in
the
3-digit decimal representation of k :
1st digit 2nd digit 3rd digit
0 From file or noun Stop on error Silent
1 From noun Continue on error Display
For example, 0!:111 abc executes the noun abc, completes, and displays.
eg, 100 1st digit is 1 ; 2nd digit is 0 ; 3rd digit is 0
regards,
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|\/| Randy A MacDonald | APL: If you can say it, it's done.. (ram)
|/\| ramacd <at> nbnet.nb.ca |
|\ | | The only real problem with APL is that
BSc(Math) UNBF'83 | it is "still ahead of its time."
Sapere Aude | - Morten Kromberg
Natural Born APL'er |
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