[R] printing difftime summary

[Sam Steingold]

> * R. Michael Weylandt <zvpunry.jrlynaqg at tznvy.pbz> [2012-11-23 09:13:36 +0000]:
>
>> 2. because difftime.summary returns a data.frame and not a
>> "Classes 'summaryDefault', 'table'" as I assume summary must return.
>
> See http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-should-I-write-summary-methods_003f

what are the requirements on the class summary.foo?
does it have to inherit from some other class?
how do I define a class?

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Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000
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