Weird, perl 5.30.0 with PDL 2.019 (which is the combo that shipped with Strawberry Perl's PDL edition) doesn't give that error.

These are the outputs for my run (adding a print "perl version $]";print "PDL version $PDL::VERSION"; at the beginning to print the versions):

<Reveal this spoiler or all in this thread>

Mathematically speaking, a [3x3] x [3x2] is the right balance of dimensions for a successful matrix multiplication (resulting in a [3x2] matrix). The use of PDL::Matrix used to be the way to make PDL match mathematical order for the dimensions, but maybe they've changed that between 2.019 and 2.057. (I don't think I can test, because the Strawberry Perl PDL setup is rather dependent on the libraries that Strawberry bundles, and I don't know if upgrading PDL will work... maybe I'll try in a sandbox to avoid ruining my "main" installation).

I tried getting rid of the use PDL::Matrix, but then that gets rid of the mpdl command, causing errors during perl's compile stage, and I'm not sure what hoops I would need to jump through to make my script compatible with both 2.019 and 2.057.

In reply to Re^3: Abstract image registration or feature detection by pryrt
in thread Abstract image registration or feature detection [UPDATED w examples] by kikuchiyo

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