SC> What's the best way to add leading zeros to a set of integers.
The compatible way, going back to J Version 5, 1992:
Over-take from the end with {. and Fit !. it to specify the fill
element:
_4 {.!.'0' 'ab'
00ab
Apply the usual extra stuff to have that work on your numeric list:
_4&({.!.'0')@":"0 a
0001
0002
0003
0004
0005
0010
0020
0030
[...]
The new way, avalailable since J Release 6.01, 2006:
'r<0>4.0' 8!:2 ,. a
Martin Neitzel
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