Trying to Get More Sets into the .matrix for Chord Diagram about d3 HOT 4 CLOSED

Yep, you need a square matrix! The chord layout is designed to show relationships between N items, so you need an N*N matrix.

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Okay - I think that makes sense. Like I said, I don't code much but in looking up a "square matrix" what I get is that columns must equal rows. So if I'm tracking sales for a team, if I have 10 sales people, I can only show 10 months? Is that right?

Does the number for d3.range also change to match this? If you could show me this with a code example I'd be very grateful. ;-)

Jeff

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Hmm, I should back up and explain what a chord diagram is—it shows you the relationships between N entities:

http://mkweb.bcgsc.ca/circos/presentations/articles/vis_tables1/#example1

The example on the website is a synthetic (rather than real-world) dataset. It shows simulated dating histories for males. For example, the black -> black value of 11,975 means that 11,975 males dumped a partner with black hair for a different partner with black hair. Whereas, 5,871 dumped a partner with black hair for a partner with blond hair, and 1,951 for vice versa.

(This is a pretty dumb dataset—I assumed it was real data. I should go find some real data to replace this example with something less chauvinistic.)

So, it doesn't make sense to have the rows as sales people and the columns as months—the rows and columns have to be the same type of thing. For example, if you wanted to show how much email sales people send to each other, you could use a chord diagram. The value in the matrix at cell <i,j> would be the number of emails from sales person i (say, Ivan) to sales person j (say, Jane).

If you want to show the amount of sales per sales person per month, I'd recommend using a streamgraph or stacked bar chart instead. There's an example of that in the repository:

https://github.com/mbostock/d3/blob/master/examples/stream/stream.html

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I've been playing with symmetrical and asymmetrical data sets with the chord layout that is, I've been successful visualizing pathways (ribbons) between two data sets with different categorical scales. The trick is in the padding with 0 values to construct the square matrix.

Even though I can format the data to correspond to the way the layout reads the cells in the matrix, I haven't figured out how to animate a time series from multiple matrices.

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