Where to start?
Maybe work your way up to building that set of indices and
then just use them for amending, maybe something like this
mat =: _ (<"1 ,.~ i. # mat) } mat
for the \ diagonal and
mat =: __ ({ ;~ (#~ 2|>:) i.# mat) } mat
for the even indices
(even wrt python indices? replace >: by ] or 2|>: by 2&|)
Am 06.02.22 um 20:24 schrieb Andrew P:
I would also like to figure out how to modify nontrivial sequences of
indexes, for instance, diagonals or cells where both the row index and the
column index are even numbers. Where should I start if I want to do that
kind of thing?
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