I looked at your links, but I cannot find anything similar to my situation. You may have to be more specific. I apologize for my ignorance. I downloaded the software last week.
I'm sorry too, I probably mis-read your requirements.
Are you looking at visualizing multi-path journies? i.e. to/from source and destination - mapping? or are you looking at working out the edges of certain points and visualizing/getting connections?
If it's the former, have a look at this blog post. The trick here was to add a "dummy" sequential time measure to the path order.
If you are looking for centroids/start/end points in the lines, that's certainly possible as well, but it's not trivial.
Thanks for being so willing to assist. Perhaps this will help. I've drawn a representation of what I hope the program can create from a 2-column spreadsheet.
The end result is a tracking map, showing all possible paths. What I have seen Tableau do seems much more advanced than this, so I have hope!
Allan, I believe that is on the right path to interpreting the data. If I could get that to display graphically as I showed above, it would be extremely useful. You can think of this as sources and destinations, with possible split and merges. I did not include merges in my example, but splits would be much more common.
One other technique might be to try a custom background image and assign coordinates to each point. This is only really scale-able for a small number of points and would make it tough if you have a lot of depth in your diagram.
Check out Finding Background Image Coordinates | Tableau Software for a step-by-step to create a custom background.
Essentially, you could assign a coordinate to each point in your diagram and then connect those with lines (start point and end point for each).
It also pains me to suggest this, but since the functionality isn't currently built into Tableau, there may be other options out there that can produce this type of diagram with less fiddling (Graphviz is free, and Omnigraffle and Visio both offer similar diagramming to what your image looks like).
Good luck - I'd love to see how you solve this, especially if you can make it work in Tableau!
Andrew is right, unless you are talking about "real-world" instances of start/destination co-ordinates on a map, with multiple pathways. I can certainly help with that
I am not sure you all understand what I am looking for. I want the output to look like my output, given input of a 2-column table. Everything suggested so far has been absolutely different than the output I was looking for. Is Tableau simply not capable of drawing such a diagram?
I drew my diagram in Visio. It is way too time consuming to do this to something that has hundreds of sources and destinations.
A --> B
A --> C
B --> F
C --> D
D --> E
E --> H
E --> G
So A has 2 edges, as does B and D. E has 3 edges. A-G are nodes.
In your excel, create an edge column, and enter the count distinct.
NodeXL will do all of this. Then use the tutorial I linked to visualize it in Tableau. Alternatively, you could write some VBA in Visio, although I suspect there will be a script already.