Doc about using the result of LINQ queries in Excel, R and Tableau

Samples/LinqPad/Queries/HTTP.sys/PopularUIs.md

@@ -0,0 +1,62 @@
+# Exporting results to .csv file
+The single-pass feature of Tx allows to perform LINQ query and feed the output directly to standard .csv file. 
+
+This can be useful to integrate with existing popular UI-s for data exploration such as Excel, R and Tableau. 
+
+## Excel
+
+To visualize the request duration as scatter-plot in Excel: 
+
+- select the Duration column
+- choose the INSERT on the ribbon, and then Recommended Charts
+- choose Scatter
+
+![RequestDurationCsvExcel.JPG](RequestDurationCsvExcel.JPG)
+
+## R
+
+To visualize the same events in R, we start from this  useful [introduction](http://www.cyclismo.org/tutorial/R/input.html#read)  
+
+    > durations = read.csv("C:\\temp\\RequestDurations.csv", header = TRUE)
+
+This reads the file into the variable dat. R provides out-of-box means to inspect data:
+ 
+    > summary(durations)
+                                    ActivityId                                  Url        HttpStatus     Duration     
+     80000146-0000-fe00-b63f-84710c7967bb:  1    http://georgis2:80/helloworld.htm:283   Min.   :304   Min.   :0.1452  
+     80000147-0000-fe00-b63f-84710c7967bb:  1    http://georgis2:80/windir.txt    :  6   1st Qu.:304   1st Qu.:0.1600  
+     80000148-0000-fe00-b63f-84710c7967bb:  1                                            Median :304   Median :0.1837  
+     80000149-0000-fe00-b63f-84710c7967bb:  1                                            Mean   :304   Mean   :0.2007  
+     8000014a-0000-fe00-b63f-84710c7967bb:  1                                            3rd Qu.:304   3rd Qu.:0.2089  
+     8000014b-0000-fe00-b63f-84710c7967bb:  1                                            Max.   :304   Max.   :0.8739  
+     (Other)  
+
+To confirm raw values are the same as in LINQPad we could do:
+
+    > durations$Duration
+   
+ And to get a chart we do:
+ 
+    > plot(durations$Duration)
+
+![RequestDurationCsvR.JPG](RequestDurationCsvR.JPG)
+
+## Tableau
+
+In [Tableau](http://www.tableausoftware.com/):
+
+* Click Open Data
+* Create connection to the file
+
+![RequestDurationCsvTableauConnection.JPG](RequestDurationCsvTableauConnection.JPG)
+
+* For X axis, create a calculated field as INDEX()
+
+![RequestDurationCsvTableauCalc.JPG](RequestDurationCsvTableauCalc.JPG)
+
+* In the Analysis menu disable the "Aggregate Measures" option 
+* Drag Duration to Rows
+* Drag the index to Columns
+
+![RequestDurationCsvTableau.JPG](RequestDurationCsvTableau.JPG)
+

Samples/LinqPad/Queries/HTTP.sys/Readme.md

@@ -66,15 +66,7 @@ Note the difference between what is happening here and exporting from LINQPad's
 - Here all events are are streamed into .csv file. Since they are not kept in-memory, this will work regardless of the size of .etl file. The disadvantage of this method is that there is nothing to see in LINQPad.
 
 
-Exporting to .csv is how Tx can be used in conjunction with tools like Excel, Tableau and R. 
-
-In Excel for example:
-
-- select the Duration column
-- choose the INSERT on the ribbon, and then Recommended Charts
-- choose Scatter
-
-![RequestDurationCsvExcel.JPG](RequestDurationCsvExcel.JPG)
+Exporting to .csv is how Tx can be used in conjunction with [popular tools](PopularUIs.md) like Excel, Tableau and R. 
 
 ## Request Duration Summary