David Mertens

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  • Buddy Burden commented on Perl and Me, Part 6: Perl Is Engineering <i>and</i> Art

    animatedream: Thanks for your comment!  Good to hear from someone on the Python side of things.

    > First, I would never argue that python makes it hard to write bad code.

    I understand that.  The problem is, the person who literally wrote the book on Python made that exact argument.

    > I don’t understand the benefit to software development in being able to express a meaning in any way but the best way.

    Well, I suppose if there were always exactly one “best way,” not only to all people, but also in all situations, in all …

  • 6ae7ba33-d12b-49cf-89f9-34434fe68707 [] commented on PDL features I'd like to see in Perl 6

    smls here. (Using stackexchange OpenID since logging in normally is borked right now for me.)

    Type checks against array dimensions/sizes

    This seems to be firmly planned, but not yet implemented:

    ➜ perl6 -e 'sub foo (@a($x, $y)) { ... };'
    ===SORRY!=== Error while compiling -e
    Shape declaration with () is reserved

    Aliasing slices

    The following already works in Perl 6 right now (with Rakudo on MoarVM):

    my int @a = 2, 4, 6, 8; # create a compact native array
    my @b := @a[1, 3];      # take a slice, and bind …
  • Aristotle commented on PDL features I'd like to see in Perl 6

    I think the new refaliasing feature (experimental in 5.22) will allow you to alias slices like so:

    \( @slice[ 0 .. 4 ] ) = \( @data[ 2, 3, 5, 7, 11 ] );

    Obviously it’s ugly to have to count out the LHS slice by hand:

    \( @slice[ 0 .. $#$_ ] ) = \( @data[ @$_ ] )
        for [2, 3, 5, 7, 11];

    That’s quite a mouthful, but at least you can package it up in a function:

    sub alias_slice {
        my ( $src, @dst ) = shift;
        \( @dst[ 0 .. $#_ ] ) = \( @$src[ @_ ] );

    \my @slice = al…

  • therflabs commented on PDL features I'd like to see in Perl 6

    Call me crazy, but I had a freelance gig converting Python numpy/scipy to Perl PDL... And barely knowing Python it was a lot easier to understand than PDL.

    I can see why numpy/scipy has gained a lot of traction.

    I'd like to see P6 PDL to be like numpy/scipy to ease crossover to Perl 6 and lower the entry level for beginners. In my opinion usability and clear documentation for the non-math scholar has hurt what PDL could have been and could be a lesson for PDL Perl 6.

  • PetaMem commented on What?! CUDA::Minimal... works?

    And here's this - with Perl 5.22, GCC 5.3.0, CUDA 7.5 anno domini 2016:
    # ./Build test
    t/00_load.t ............... ok   
    t/Index-Manipulation.t .... ok   
    t/Memory.t ................ ok   
    t/Transfer.t .............. ok     
    t/z_PDL.t ................. ok     
    t/z_kernel_invocations.t .. ok    
    All tests successful.
    Files=6, Tests=76,  1 wallclock secs ( 0.02 usr  0.01 sys +  0.21 cusr  0.74 csys =  0.98 CPU)
    Result: PASS

    You have to do some hacking

    to remain silent about gcc …

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