in reply to problem with PDL
#!/usr/bin/perl use warnings; use strict; use PDL; use PDL::MatrixOps; ..... .... [download]
You're correct, but once you use PDL, it's no longer necessary to use PDL::MatrixOps (although it's harmless to do so).
Do not rebuke them with harsh words ... but rather lead them gently - with URLs - so that they may learn wisdom.