Volume to and from two locations

[#1]

Hi,

I have a "from" location and a "to" location and measure a volume of traffic between them. How can I add an expression that shows reverse traffic? Thank you!

[tresesco]

Could you share a sample qvw? Check :Preparing examples for Upload - Reduction and Data Scrambling

[Gysbert_Wassenaar]

Open the Properties window of your chart, go to the Expressions tab and click on the Add button to add another expression. Then enter your expression.

If you don't know what expression to enter then try to explain how the result should be calculated.

[#4]

I'm trying to build a flow chart. I have origin city, destination city and I can easily count flights between them but I would like another column (expression) to show number of flights back (from destination city to origin city) - this would show as another line in the chart but I need the two values together.