I need to be able to match a vector inside a PDL, and can't find a way to do
it. The existence of qsortvec and uniqvec functions implies that such a
comparison function exists (since you'd need to do that to sort) but the
documentation doesn't give any info on it. More specifically, if I have an nxm
PDL $P, containing vectors of length n in the first dimension, and an nx1 PDL
representing a test vector, $test, I want to be able to get the indices along
the 2nd dimension where the vector in the PDL matches the test one.
I would expect that such a function, which I'll provisionally name findveci,
would operate as
$findresult = $P->findveci($test)
Where $findresult would be a 1-dimensional PDL giving the set of indices along
the second dimension of $P that match the vector $test.
I should note that a similar purpose would be served by a function uniqveci
(which, although an obvious extension of the set that are available, also seems
not to exist), since you could combine that with qsortvec to do what I'm
talking about. At present, I've resorted to pulling the vectors into perl
lists and doing the matching there. But that's far slower, and it seems wrong
to have to do it that way.
Any suggestions?
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