perlpdl

Difference between PDL::Core and PDL::Core ':Internal'

I just started using PDL and saw in the documentation that there are 2 possible ways of importing PDL's core function:

use PDL::Core;
use PDL::Core ':Internal';

What exactly is the difference here? The documentation makes a comment on the second method: "Hairy routines". I also could not find anything about what's meant by that.

Solution 
  • use PDL::Core;

    is equivalent to

    use PDL::Core ':Func';

    which is equivalent to

    use PDL::Core
   qw( piddle pdl null barf ),
   ( map $_->convertfunc, PDL::Types::types() ),
   qw(
      nelem dims shape null empty dup dupN inflateN
      convert inplace zeroes zeros ones nan inf i list listindices unpdl
      set at flows broadcast_define over reshape dog cat barf type
      thread_define dummy mslice approx flat sclr squeeze
      get_autopthread_targ set_autopthread_targ get_autopthread_actual
      get_autopthread_dim get_autopthread_size set_autopthread_size
   );

    use PDL::Core ':Internal';

    is equivalent to

    use PDL::Core qw( howbig broadcastids topdl );