minor error in documentation of pmax in base (PR#2513)
In a way it is not surprising, but some functions that operate on vectors will coerce their outputs into vectors and others won't. For example, try m1 <- array(1:24,c(2,3,4)) sort(m1) order(m1) It would be nice to say when each of these things will happen. For example, in the documentaition for ifelse, it says, "returns a value with the same shape as". This sort of language would be helpful. Jon
On 01/31/03 12:42, Liaw, Andy wrote:
If I'm not mistaken, matrices and arrays are just vectors with dim attribute. so I'm not surprised that pmax and pmin work as they do. You get the same answer by the following: array(pmax(1:24, 24:1), c(2, 3, 4)) array(pmin(1:24, 24:1), c(2, 3, 4)) Cheers, Andy
-----Original Message----- From: baron@cattell.psych.upenn.edu [mailto:baron@cattell.psych.upenn.edu] Sent: Friday, January 31, 2003 12:37 PM To: r-devel@stat.math.ethz.ch Cc: R-bugs@biostat.ku.dk Subject: [Rd] minor error in documentation of pmax in base (PR#2513) The documentation says, "pmax and pmin take several vectors as arguments and return a single vector giving the parallel maxima (or minima) of the vectors." I discovered that, if you use a matrix or array instead of a vector, pmax returns a matrix or array, respectively. This makes pmax and pmin much more useful, and should not be left to people to discover on their own! For example: m1 <- array(1:24,c(2,3,4)) m2 <- array(24:1,c(2,3,4)) pmax(m1,m2) pmin(m1,m2) Jon Baron
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Jonathan Baron, Professor of Psychology, University of Pennsylvania Home page: http://www.sas.upenn.edu/~baron Psychology webmaster: http://www.psych.upenn.edu/ R page: http://finzi.psych.upenn.edu/ Questionnaires: http://www.psych.upenn.edu/~baron/qs.html