Re: 36 Conditions in If Statement [sendhelp]

Here’s an approach which, although less efficient, is easier to read and therefore to debug:

use strict;
use warnings;
use List::Util qw( all );

...
# create and populate my @matrix as before
...

my @indices =
(
    [0, 4, 0], [0, 4, 1], [0, 4, 2],
    [1, 4, 0], [1, 4, 1], [1, 4, 2],
    [2, 4, 0], [2, 4, 1], [2, 4, 2],
    [4, 4, 0], [4, 4, 1], [4, 4, 2],    # A
    [5, 4, 0], [5, 4, 1], [5, 4, 2],
    [6, 4, 0], [6, 4, 1], [6, 4, 2],
    [4, 0, 0], [4, 0, 1], [4, 0, 2],
    [4, 1, 0], [4, 1, 1], [4, 1, 2],
    [4, 2, 0], [4, 2, 1], [4, 2, 2],
    [4, 4, 0], [4, 4, 1], [4, 4, 2],    # B
    [4, 5, 0], [4, 5, 1], [4, 5, 2],
    [4, 6, 0], [4, 6, 1], [4, 6, 2],
);

my   @to_test;
push @to_test, $matrix[ $_->[0] ][ $_->[1] ][ $_->[2] ] for @indices;

print "It worked\n" if all { $_ == 1 } @to_test;
[download]

By making it easier to see which array elements are being tested, this approach reveals that three of the tests are in fact duplicated (see the lines labelled A and B).

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

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Re^2: 36 Conditions in If Statement [sendhelp] by AnomalousMonk (Archbishop) on Feb 04, 2017 at 17:58 UTC
The approach you suggest is very ++nice. It can easily be adapted to other cases; e.g., a case in which the comparison may vary with each tuple of indices. `use strict; use warnings; use List::Util qw(all); # create and populate my @matrix as before ... my @tuples = ( [1, 0, 4, 0], [2, 0, 4, 1], [3, 0, 4, 2], [4, 1, 4, 0], [5, 1, 4, 1], [6, 1, 4, 2], ... [9, 4, 6, 0], [8, 4, 6, 1], [7, 4, 6, 2], ); do_something() if all { $_->[0] == $matrix[$_->[1]][$_->[2]][$_->[3]] +} @tuples;` [download] At a slight performance cost, the subroutine block of `all` could be made a bit more readable: `{ my ($n, $i, $j, $k) = @$_; $n == $matrix[$i][$j][$k]] }` Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]

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Re^2: 36 Conditions in If Statement [sendhelp]
by AnomalousMonk (Archbishop) on Feb 04, 2017 at 17:58 UTC

The approach you suggest is very ++nice. It can easily be adapted to other cases; e.g., a case in which the comparison may vary with each tuple of indices.

use strict;
use warnings;
use List::Util qw(all);

# create and populate my @matrix as before
...

my @tuples = (
    [1, 0, 4, 0], [2, 0, 4, 1], [3, 0, 4, 2],
    [4, 1, 4, 0], [5, 1, 4, 1], [6, 1, 4, 2],
    ...
    [9, 4, 6, 0], [8, 4, 6, 1], [7, 4, 6, 2],
    );

do_something() if all { $_->[0] == $matrix[$_->[1]][$_->[2]][$_->[3]] 
+} @tuples;
[download]

all

{ my ($n, $i, $j, $k) = @$_; $n == $matrix[$i][$j][$k]] }

Give a man a fish: <%-{-{-{-<

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