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Excel/README.md

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+## Node.js + Edge.js + Edge-ps (PowerShell) + Excel 
+
+```javascript
+var edge = require('edge');
+
+var excelPS = edge.func('ps', function () {/*
+    
+    $data = $inputFromJS | Invoke-Expression
+    
+    $xl = New-Object -ComObject Excel.Application    
+    $wf = $xl.WorksheetFunction    
+
+    New-Object PSObject -Property @{
+        Median = $wf.Median($data)
+        StDev  = $wf.StDev($data)
+        Var    = $wf.Var($data)
+    } | ConvertTo-Json
+
+    $xlProcess = Get-Process excel
+    $xlProcess.kill()   
+*/});
+
+// Invoke PowerShell, it start Excel, gets a WorksheetFunction and then calls
+// Median, StDev and Var on the array of data passed in.
+// Here we are passing an array of 1 to 100
+excelPS('1..100', function(error, result){
+
+    if(error) throw error;
+
+    console.log(result[0]);
+});
+```
+
+```
+{
+    "Median":  50.5,
+    "StDev":  29.011491975882016,
+    "Var":  841.66666666666663
+}
+```