printing difftime summary

* R. Michael Weylandt <zvpunry.jrlynaqg at tznvy.pbz> [2012-11-22 12:11:55 +0000]:

I now think that what I want is
--8<---------------cut here---------------start------------->8---
difftime.summary <- function (v) {
  s <- summary(as.numeric(v))
  r <- as.data.frame(sapply(s,difftime2string),stringsAsFactors=FALSE)
  names(r) <- c("string")
  r[[units(v)]] <- s
  r
}

Any reason not summary.difftime to get S3 dispatch?

I hoped that someone will ask this :-)

1. because its argument has type "vector of difftime", not "difftime"
(coming from CLOS, I do not expect summary(vector of difftime) to
dispatch to summary.difftime, but to summary.vector.of.difftime or something)

2. because difftime.summary returns a data.frame and not a
"Classes 'summaryDefault', 'table'" as I assume summary must return.

if these are not valid issues, then I wonder why my function should not
be the system default method.

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