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custom string tick labels / categories

 
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stschiff



Joined: 04 Mar 2009
Posts: 34
Location: Cologne, Germany

PostPosted: Fri Feb 21, 2014 9:01 pm    Post subject: custom string tick labels / categories Reply with quote

Hi,

is it possible to make categorical axes in DataTank, with custom string values as tick marks, similar to DataGraph? What I have in mind is data in the form of a matrix, with rows and columns denoted by names. I would like to be able to plot a colormesh with strings as the axes tick labels instead of numbers… this would be useful to plot a heat map indicating e.g. correlations between items with names rather than ordered numbers.

I guess the easiest way to achieve that is to allow the axes drawing command to take a list of strings as input.

Stephan
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David
Site Admin


Joined: 25 Nov 2006
Posts: 1929
Location: Chapel Hill, NC

PostPosted: Sat Feb 22, 2014 1:54 pm    Post subject: Reply with quote

Can you e-mail me an example? Just to give me a better idea.

What I will likely do is to make it easy to send data from DataTank to DataGraph. That way I don't have to move everything over. DataGraph has a lot more control over the look of the graph, and moving all of that over would be a lot of work. DataTank is pretty good at driving other programs, and DataGraph has streaming support already (dgraphconnect uses that)

DataGraph right now has a pretty primitive scalar field (2D Mesh) support, but a lot of that has to do with the fact that I haven't figured out how to input the objects. I currently have a way to input uniformly spaced meshes, but DataTank has unstructured, logically rectangular and uniform.

David
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Adam Maxwell



Joined: 23 Feb 2014
Posts: 4

PostPosted: Tue Feb 25, 2014 10:06 pm    Post subject: Reply with quote

For what it's worth, I could use this for 1-D and 2-D plots, especially to be able to add date/time strings on an axis. For ocean models, we have a date as some time since a reference date, but a time axis of e.g. 0-50,000 minutes is just confusing to people.

I expect the margins would be tricky to get right, though, and there'd have to be some way of mapping strings to discrete axis values and sparsifying them appropriately.
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