(u: 97 98 99)&, <== (3)
(10&u: 97 98 99)&, <== (3)
Good suggestion for 3/ howerver
if ascii of string is in range of 32 and 127 then it possible
(u: 'abc')&,
(10&u: 'abc')&,
else if the string is valid unicode then it may also
be possbile using the form
(7&u: 'someutf8string')&,
(9&u: 'someutf8string')&,
But J literal4 contain the full range of 4 bytes, so some are
invalid unicode characters and should use the current format.
Thu, 21 Nov 2019, Kirk Iverson написал(а):
> A recent thread in the programming forum (00 strange?) inspired me to look at
> this new behaviour in 901.
>
> NB. Numeric
> datatype&.> 'b i f x c'=. 0 1;(0 1+0);(0 1%1);0 1x;0,1j1-0j1
> +-------+-------+--------+--------+-------+
> |boolean|integer|floating|extended|complex|
> +-------+-------+--------+--------+-------+
> b&+
> 0 1&+
> i&+
> 00 1&+ <== (1)
> f&+
> 0 1.&+
> x&+
> 0 1x&+
> c&+
> 0 1&+ <== (2)
>
>
> NB. Character
> d=. (0{a.);'abc'
> 'lctrl lascii'=. d
> 'uctrl uascii'=. u:&.> d
> 'Uctrl Uascii'=. 10 u:&.> d
> datatype&.>lctrl;lascii;uctrl;uascii;Uctrl;Uascii
> +-------+-------+-------+-------+--------+--------+
> |literal|literal|unicode|unicode|unicode4|unicode4|
> +-------+-------+-------+-------+--------+--------+
> lctrl&,
> (00{a.)&,
> lascii&,
> 'abc'&,
> uctrl&,
> (u: 00)&,
> uascii&,
> (u: 97 98 99)&, <== (3)
> Uctrl&,
> (10&u: 00)&,
> Uascii&,
> (10&u: 97 98 99)&, <== (3)
>
>
> 1/ Is there a reason that it is the first element of an integer array which
> has extra decoration, rather than the last element (as in the other cases)?
>
> 2/ Shouldn't this display as 0 1j0&+ ?
> Also, when interpreting constants in a line of J:
> 0 1 is boolean
> 00 1 is integer
> 0 1. is floating
> 0 1x is extended (as is 0 1r1)
> 0 1j0 is integer
> Shouldn't this last one be complex?
>
> 3/ Can the representations of uascii and Uascii make use of literals (like
> lascii does)?
>
> /K
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
--
regards,
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