[Rd] Package checking: verifying plots
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Jan 22 15:59:54 CET 2014
On 22/01/2014 14:35, Therneau, Terry M., Ph.D. wrote:
> I pride myself on having an extensive and comprehensive test suite for
> the survival package.
>
> However, I don't have a good procedure for testing the plotting
> routines. (Forget "good", I don't even have a third-rate procedure for
> this.) This was brought home with the latest release; within 24 hours I
> got a note about a problem. They y-axis range for a plot was calculated
> incorrectly, giving no warning or error, just a graph with 2/3 of the
> data outside the plot window. It was a side effect of a change for
> another reason, and of course I had checked out that consequence
> thoroughly.
>
> Any good ideas for this issue?
>
> Terry Therneau
>
The R tests are comparisons of uncompressed PDF files (which are almost
text files). See the 'tests' directory.
Paul Murrell gave a talk about another method at an early DSC:
https://www.stat.auckland.ac.nz/~paul/Talks/qa.pdf and now has a
graphicsQC package.
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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