There’s a table for Complex Numbers, and | is \|•\| in that context.
As a Scalar Monadic Verb on non-complex arguments, however,
| is usually learned as |•|, or in J
| -: (* *)
saying | means \|•\| might lead people to believe
5 = | 3 4
even though the heading says /Scalar/ Monadic Verbs
Second day J-er:
“The above didn’t work? It’s Scalar? I know: 5 = |"(1) 3 4”
Maybe someone has an idea of how to “fix” this?
Should we mention it reduces to |•| on real values?
But then where to draw the line?
We obviously don’t need to explain monadic +
but there are quite some verbs the application
to real values of which is a known mapping.
Or is it better to show the complex example instead
so people may better understand why it says \|•\| ?
Then again, complex numbers are the most general case
in some (arithmetic) examples but in other contexts are
interpreted differently (as a surrogate for real pairs)
These thoughts aren’t leading anywhere, I’d better go to bed now
(midnight local time)
Am 09.08.22 um 22:13 schrieb Henry Rich:
Viktor Grigorov has a draft version of the new J Reference Card. Please
criticize it.
The source for the card is a LaTeX document, and will be freely
available for editing.
A PDF version is at
https://drive.google.com/file/d/1bpyfmksD-XEJaJJ972jOy3b2_KWfV0Wi/view?usp=sharing
Henry Rich
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