Another update from ingydotnet^djgoku

Task/Matrix-multiplication/PowerShell/matrix-multiplication.psh

@@ -0,0 +1,31 @@
+function array-mult($A, $B) {
+    $C = @()
+    if($n -gt 0) {
+        $C = 0..($n-1)| foreach{@(0)}
+        0..($n-1)| foreach{
+            $i = $_
+            $C[$i] = 0..($n-1)| foreach{
+                $j = $_
+                $((0..($n-1) | foreach{
+                    $k = $_
+                    $A[$i][$k]*$B[$k][$j]
+                } | measure -Sum).Sum)
+            }
+        }
+    }
+    $C
+}
+function show($a) {
+    if($a.Count -gt 0) {
+        $n = $a.Count - 1
+        0..$n | foreach{ "$($a[$_][0..$n])" }
+    }
+}
+$A = @(@(1,2),@(3,4))
+$B = @(@(5,6),@(7,8))
+$I = @(@(1,0),@(0,1))
+$C = array-mult $A $B
+$D = array-mult $A $I
+show $C
+" "
+show $D