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ch-2.pl
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ch-2.pl
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#!/usr/bin/perl -s
use v5.24;
use Test2::V0 '!float';
use PDL;
use PDL::NiceSlice;
our ($tests, $examples);
run_tests() if $tests || $examples; # does not return
die <<EOS unless @ARGV;
usage: $0 [-examples] [-tests] [MATRIX]
-examples
run the examples from the challenge
-tests
run some tests
MATRIX
a square matrix in any form accepted by the PDL string constructor,
e.g. '[ [1, 0, 0, 2], [0, 3, 4, 0], [0, 5, 6, 0], [7, 0, 0, 1] ]'
EOS
### Input and Output
say +(qw(false true))[is_x("@ARGV")];
### Implementation
#
# For details see:
# https://github.sommrey.de/the-bears-den/2024/04/26/ch-266.html#task-2
sub is_x {
my $m = pdl @_;
my ($on_x, $off_x) = $m->where_both(identity($m) | identity($m)->(-1:0));
all($on_x) && !any($off_x);
}
### Examples and tests
sub run_tests {
SKIP: {
skip "examples" unless $examples;
is is_x([ [1, 0, 0, 2],
[0, 3, 4, 0],
[0, 5, 6, 0],
[7, 0, 0, 1],
]), T(), 'example 1';
is is_x([ [1, 2, 3],
[4, 5, 6],
[7, 8, 9],
]), F(), 'example 2';
is is_x([ [1, 0, 2],
[0, 3, 0],
[4, 0, 5],
]), T(), 'example 3';
}
SKIP: {
skip "tests" unless $tests;
is is_x([ [1, 0, 0, 2],
[0, 3, 4, 0],
[0, 5, 6, 0],
[7, 0, 0, 0],
]), F(), 'zero on X';
is is_x([ [1, 0, 0, 2],
[0, 3, 4, 0],
[0, 5, 6, 1],
[7, 0, 0, 1],
]), F(), 'nonzero off X';
}
done_testing;
exit;
}