Challenge 053 task 1

1 files changed, 65 insertions, 0 deletions

diff --git a/challenge-053/jo-37/perl/ch-1.pl b/challenge-053/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..392644fa44
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+++ b/challenge-053/jo-37/perl/ch-1.pl
@@ -0,0 +1,65 @@
+#!/usr/bin/perl -s
+
+use v5.20;
+use Test2::V0 '!float';
+use PDL;
+use PDL::NiceSlice;
+use experimental 'signatures';
+
+our ($tests, $examples, $verbose, $rot);
+$rot //= 0;
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [-rot=ROT] [MATRIX]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+-rot=ROT
+    rotate given matrix by ROT * 90° clockwise
+
+MATRIX
+    a matrix in any form as accepted by the PDL string constructor
+
+EOS
+
+
+### Input and Output
+
+main: {
+    my $m = long "@ARGV";
+    $m = rot_m($m) for 1 .. $rot;
+    say $m;
+}
+
+
+### Implementation
+
+sub rot_m ($m) {
+	$m->xchg(0,1)->(-1:0);
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        my $m = long [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ];
+        say $m = rot_m($m) for 1 .. 3;
+
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}