Richard H. McCullough wrote:
> I wanted to process my list in chunks of 3, so I wrote
> nvlist := []
> every i := 1 to *longlist by 3 do
> put(nvlist, longlist[i :+3])
> every nv := !nvlist do
> ...
> But instead of getting 1:3, 4:6, 7:9, 10:12
> I got 1:2, 3:3, 6:3, 9:3
>
> My thoughts are
> 1. i :+3 seems natural, because two indices are separated by :
> and i is the first index.
> 2. I consulted the Unicon book, and found the "correct" way i +: 3
> 3. The result I got makes no sense at all to me.
+ is a legal unary operator for absolute value, so, as Andrew mentioned,
what you wrote is the same as writing:
longlist[ i : +3]
just as
longlist[ i:-3 ]
is treated as
longlist[ i : -3 ]
You have to think of [+:], [-:], and [:] as three list subsection
operators instead of trying to view : as a separator.
--
--
Steve Wampler [EMAIL PROTECTED]
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