I was reading Cleve's post a few months ago about the Lake Arrowhead Coauthor Graph and saw a comment that mentioned an SO thread on schemaballs. This was an interesting read and it was neat to see how this thread inspired the FEX entry.
Oleg's schemaball allows you to plot correlation matrices as schemaballs with optional labels and colors. Additionally, it passes back the handles so you can make any other changes after creating it. He provides a good help section and some examples as well as defaults. I also appreciated the "See Also" section where Oleg points to corrplot, a function I'd never heard of before about three minutes ago!
Here, is an example that uses gallery's 'randcorr' option to generate a random correlation matrix:
h = schemaball(gallery('randcorr',18),,[1 0.25 0; 1 1 0.125],[0.8 0 0.8]); set(h.l(~isnan(h.l)), 'LineWidth',2)
The reason I picked this file isn't actually because of the schemaball. Oleg included, along with the schemaball, a schemaballUnit unit testing class that uses R2013a's new MATLAB unit testing framework. Having used this framework a fair amount now, this caught my attention. It was the first (and to my knowledge, only) file on the FEX to use the new framework.
Let's see it in action:
TestSB = schemaballUnit; %Schemaball test object Results = run(TestSB) %Run it and retrieve results
Running schemaballUnit . Done schemaballUnit __________ Results = TestResult with properties: Name: 'schemaballUnit/verifyErrorsWarnings' Passed: 1 Failed: 0 Incomplete: 0 Duration: 0.1482 Totals: 1 Passed, 0 Failed, 0 Incomplete. 0.14818 seconds testing time.
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