Paolo and Devon provided the named dyadic verbs Fill and lead0s that perform the function I specified. Devon's verb has some extra bells and whistles which I like. Roger pointed out that the built-in format function 8!:2 allows a fill option, but with my limited J expertise I wasn't able to turn Roger's example into a named dyadic verb. I liked R.E. Boss' approach, as it automatically sets the number of characters, given the number of characters in the largest integer, as that would work for my current problem. Again, however, I don't know how to turn that verb into a named monadic verb. All in all, I learned quite a lot from this exercise.
Skip On Sun, Feb 3, 2019 at 2:36 AM Skip Cave <s...@caveconsulting.com> wrote: > What's the best way to add leading zeros to a set of integers. How to > design a verb f, that does the following: > > a =. 1 2 3 4 5 10 20 30 40 50 100 200 300 400 500 1000 2000 3000 4000 > 5000 > 4 f a NB. make each integer a total of 4 digits using leading zeros. > 0001 0002 0003 0004 0005 0010 0020 0030 0040 0050 0100 0200 0300 0400 0500 > 1000 2000 3000 4000 5000 > > Skip > > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
