Add Transpose Matrix in Ruby

archive/r/ruby/transpose-matrix.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+USAGE = "Usage: please enter the dimension of the matrix and the serialized matrix"
+
+def usage!
+  warn USAGE
+  exit 1
+end
+
+def parse_int(str)
+  Integer(str)
+rescue ArgumentError, NoMethodError
+  usage!
+end
+
+def parse_list(str)
+  str.split(",").map { parse_int(it.strip) }
+end
+
+cols_str, rows_str, matrix_str = ARGV
+
+usage! if cols_str.nil? || rows_str.nil? || matrix_str.nil?
+usage! if cols_str.strip.empty? || rows_str.strip.empty? || matrix_str.strip.empty?
+
+cols = parse_int(cols_str)
+rows = parse_int(rows_str)
+
+usage! if cols <= 0 || rows <= 0
+
+flat = parse_list(matrix_str)
+usage! if flat.length != cols * rows
+
+matrix = flat.each_slice(cols).to_a
+transposed = matrix.transpose
+
+puts transposed.flatten.join(", ")