I'm probably wrong, but when I first saw Harvey's request, I thought by amend he might be visualizing something like -
(],%:) &.> <"0 ]i. 2 5 +-------------+-------------+-------------+-------------+---+ |0 0 |1 1 |2 1.414213562|3 1.732050808|4 2| +-------------+-------------+-------------+-------------+---+ |5 2.236067977|6 2.449489743|7 2.645751311|8 2.828427125|9 3| +-------------+-------------+-------------+-------------+---+ - joey > On 2021May 15, at 02:16, 'Mike Day' via Programming > <programm...@jsoftware.com> wrote: > > Sorry... another early send! > > You’ve already had some helpful, constructive, replies. All I’ve got to add > is to wonder why you’re working with boxed data if your data are as regular > as your example suggests. > > If you really do have m rows of n boxed numeric values, why not just open it > up with > ? You can do a lot of processing on the whole array. Box it all > up again at the end if really necessary with <“0 (boxed scalars) or <“1 > (boxed rows) > > But perhaps I’ve misunderstood your requirements, > > Cheers, > > Mike > > Sent from my iPad > >> On 15 May 2021, at 10:08, Mike Day <mike_liz....@tiscali.co.uk> wrote: >> >> >> >> Sent from my iPad >> >>> On 15 May 2021, at 04:13, HH PackRat <hhpack...@gmail.com> wrote: >>> >>> Hello again! >>> >>> I'm thinking, for example, of a table of boxed data in its transposed >>> horizontal position that has, say, 3 rows of, say, 1000 *boxed* values >>> each. My goal is to amend *all* of the boxed values to their square >>> roots in one version of what I want to do and *all* of the original >>> boxed values to their logarithmic equivalents (maybe multiplied by a >>> constant, say, 100) in a second version . >>> >>> Using what I know from past answers to my questions, I'm sure I could >>> use "for" loops with repeated amends to accomplish this, but that >>> seems to be working against J's efficiency in dealing with large >>> quantities of data at once. >>> >>> How can I do such a mass "amend" of entire tables in one fell swoop in >>> J? Please show EXPLICIT code rather than tacit code. >>> >>> Thanks for any and all help! >>> >>> Harvey >>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
