2016 Update

Task/Spiral-matrix/PowerShell/spiral-matrix.psh

@@ -0,0 +1,36 @@
+function Spiral-Matrix ( [int]$N )
+    {
+    #  Initialize variables
+    $X = 0
+    $Y = -1
+    $i = 0
+    $Sign = 1
+
+    #  Intialize array
+    $A = New-Object 'int[,]' $N, $N
+
+    #  Set top row
+    1..$N | ForEach { $Y += $Sign; $A[$X,$Y] = ++$i }
+
+    #  For each remaining half spiral...
+    ForEach ( $M in ($N-1)..1 )
+        {
+        #  Set the vertical quarter spiral
+        1..$M | ForEach { $X += $Sign; $A[$X,$Y] = ++$i }
+
+        #  Curve the spiral
+        $Sign = -$Sign
+
+        #  Set the horizontal quarter spiral
+        1..$M | ForEach { $Y += $Sign; $A[$X,$Y] = ++$i }
+        }
+
+    #  Convert the array to text output
+    $Spiral = ForEach ( $X in 1..$N ) { ( 1..$N | ForEach { $A[($X-1),($_-1)] } ) -join "`t" }
+
+    return $Spiral
+    }
+
+Spiral-Matrix 5
+""
+Spiral-Matrix 7