Data update

Task/Matrix-multiplication/PowerShell/matrix-multiplication.ps1

@@ -0,0 +1,33 @@
+function multarrays($a, $b) {
+    $n,$m,$p = ($a.Count - 1), ($b.Count - 1), ($b[0].Count - 1)
+    if ($a[0].Count -ne $b.Count) {throw "Multiplication impossible"}
+    $c = @(0)*($a[0].Count)
+    foreach ($i in 0..$n) {
+        $c[$i] = foreach ($j in 0..$p) {
+            $sum = 0
+            foreach ($k in 0..$m){$sum += $a[$i][$k]*$b[$k][$j]}
+            $sum
+        }
+    }
+    $c
+ }
+
+function show($a) { $a | foreach{"$_"}}
+
+$a = @(@(1,2),@(3,4))
+$b = @(@(5,6),@(7,8))
+$c = @(5,6)
+"`$a ="
+show $a
+""
+"`$b ="
+show $b
+""
+"`$c ="
+$c
+""
+"`$a * `$b ="
+show (multarrays $a $b)
+" "
+"`$a * `$c ="
+show (multarrays $a $c)