In a few places in the R source code, such as the $initialize element of `family` objects, and in the body of power.t.test() (possibly other power.* functions), sets of instructions that will need to be run later are encapsulated by saving them as an expression and later applying eval(), rather than as a function. This seems weird to me; the only reason I can think of for doing it this way is to avoid having to pass back multiple objects and assign them in the calling environment (since R doesn't have a particularly nice form of Python's tuple-unpacking idiom).

  Am I missing something?

 cheers
   Ben


https://github.com/r-devel/r-svn/blob/eac72e66a4d2c2aba50867bd80643b978febf5a3/src/library/stats/R/power.R#L38-L52

https://github.com/r-devel/r-svn/blob/master/src/library/stats/R/family.R#L166-L171

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