Another update from ingydotnet^djgoku

Task/Arithmetic-geometric-mean/PowerShell/arithmetic-geometric-mean.psh

@@ -0,0 +1,14 @@
+function agm ([Double]$a, [Double]$g) {
+    [Double]$eps = 1E-15
+    [Double]$a1 = [Double]$g1 = 0
+    while([Math]::Abs($a - $g) -gt $eps) {
+        $a1, $g1 = $a, $g
+        $a = ($a1 + $g1)/2
+        $g = [Math]::Sqrt($a1*$g1)
+    }
+    [pscustomobject]@{
+        a = "$a"
+        g = "$g"
+    }
+}
+agm 1 (1/[Math]::Sqrt(2))