Matrix multiplication: Difference between revisions

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@@ Line 3,567: / Line 3,567: @@
 <lang PowerShell>
 function multarrays($a, $b) {
+    $n,$m,$p = ($a.Count - 1), ($b.Count - 1), ($b[0].Count - 1)
-    $c = @()
-    if($a -and $b) {
+    if ($a[0].Count -ne $b.Count) {throw "Multiplication impossible"}
-        $n = $a.count - 1
+    $c = @(0)*($b.Count)
-        $m = $b[0].count - 1
+    foreach ($i in 0..$n) {
-        $c = @(0)*($n+1)
+        $c[$i] = foreach ($j in 0..$p) {
-        foreach ($i in 0..$n) {
+            $sum = 0
-            $c[$i] = foreach ($j in 0..$m) {
+            foreach ($k in 0..$m){$sum += $a[$i][$k]*$b[$k][$j]}
-                $sum = 0
+            $sum
-                foreach ($k in 0..$n){$sum += $a[$i][$k]*$b[$k][$j]}
-                $sum
-            }
         }
     }
     $c
-}
+ }
-function show($a) {
+function show($a) { $a | foreach{"$_"}}
-    if($a) {
-..($a.count - 1) | foreach{ if($a[$_]){"$($a[$_])"}else{""} }
-    }
-}
 $a = @(@(1,2),@(3,4))
 $b = @(@(5,6),@(7,8))