[Jprogramming] Mass amend

[greg heil]

sorry, escaped too soon;)
---
Harvey

sounds like you are reaching for each, eg

   %: each 4;9;16
+-+-+-+
|2|3|4|
+-+-+-+

where this is
squareroot %:, under %. , boxing >, y

~greg heil
https//picsrp.github.io

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from: HH PackRat <hhpackrat at gmail.com>
to: programming at jsoftware.com
date: May 14, 2021, 8:13 PM
subject: [Jprogramming] Mass amend

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