On 2007.09.03 16:02:01, you,
the extraordinary adam dunne, emitted:
> Date: Mon, 3 Sep 2007 16:02:01 +0530
> From: "adam dunne" <[EMAIL PROTECTED]>
> To: "Programming forum" <[email protected]>
> Subject: [Jprogramming] indices
>
> NB.suppose i have a list:
> z=.5 5 2 20 20 20 60 60 2 2
> =z
> 1 1 0 0 0 0 0 0 0 0
> 0 0 1 0 0 0 0 0 1 1
> 0 0 0 1 1 1 0 0 0 0
> 0 0 0 0 0 0 1 1 0 0
> NB.how can i generate a list of what will be indices:
> NB. 0 0 1 2 2 2 3 3 4 4
> NB.from original list
If one has the nub, say nz, and the selfclassify, say scz, of a list z,
z -: (,@:I.@|: scz){nz
e.g.:
z=: (?10#3){'abc'
nz=: ~. z
scz=: =z
z;nz;scz
+----------+---+-------------------+
|bbcbcbaaac|bca|1 1 0 1 0 1 0 0 0 0|
| | |0 0 1 0 1 0 0 0 0 1|
| | |0 0 0 0 0 0 1 1 1 0|
+----------+---+-------------------+
(,@:I.@|: scz){nz
bbcbcbaaac
--
Nollaig MacKenzie
http://www.yorku.ca/nollaig
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