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Re: perl6 matrix arrayof arrays

by mr_ron (Chaplain)
on Mar 22, 2018 at 13:24 UTC ( [id://1211523]=note: print w/replies, xml ) Need Help??


in reply to perl6 matrix arrayof arrays

cannot use @arr[0].elems : gives an error

Like @arr vs $#arr in Perl, I'm guessing @arr[0].elems was causing warnings for accessing the element just after the end of an array.

A possible alternative coding:

use v6;

my  @arr  = [
    [ 1.1,2.2,3.3,4.4,5.5 ],
    [ 10,20,30,40,50 ],
    [ 100,200,300,400,500 ],
    [ 1000,2000,3000,4000,5000 ],
];

dd @arr; # dump the matrix

for @arr {
      say ( .map: {.fmt: "%7.1f\t"} ).join
}

say "=======\t" x @arr[0].elems;
say ( (0..@arr[0].end).map: {@arr[*; $_].sum.fmt("%7.1f\t")} ).join;
#say ( ([Z] @arr).map: { .sum.fmt("%7.1f\t") } ).join;

[download]
Ron

Replies are listed 'Best First'.
Re^2: perl6 matrix arrayof arrays
by Anonymous Monk on Mar 22, 2018 at 14:31 UTC
    hello Ron

    Thanks for you're reply. As i said : just starting with perl6.
    Learning from the docs is not easy. But what you showed me was easy to understand

    wanted to use the + in calculating the totals of each column. The way with sum is new to me.
    Thanks for showing this option to do it an other way..

[reply]

      Since you describe the "docs" as "not easy", I am concerned that you are only looking at docs.perl6.org and not also looking at the tutorial level information at perl6.org/resources. Have you looked at tutorials or introductory books?

      A review of the tutorials led me to refine:

      for @arr {
      say ( .map: {.fmt: "%7.1f\t"} ).join
}

      [download]
      to be 
      for @arr {
    say ($_>>.fmt: "%7.1f\t" ).join
}

      [download]
      Ron
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