I have two piddles, $a, $b. I want a piddle that contains the positions of $a for the elements that are also anywhere in $b. Something along the lines of (though this doesn't work):
$c=which($a==$b);

Does anyone know if there's a syntax in pdl to do it? Right now I'm just looping over the elements of $b, and grabbing each individual position, which I then append in another piddle.

In reply to matching pdl elements by Anonymous Monk

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