search for: pmax2

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2015 Dec 24
2
override pmin/pmax for my own matrix
Hello, I'm trying to override pmin and pmax for my own matrix. These two functions have ... as an argument. I tried to override them as follows: setMethod("pmax", class_name, function(x, ..., na.rm) { ... }) I use this way to override primitive functions such as min/max and it works fine. But it doesn't work for pmin and pmax. I guess because they are regular functions? How
2015 Dec 24
0
override pmin/pmax for my own matrix
...;...") setMethod("pmax", "Class", function(..., na.rm=FALSE) { }) One caveat is that all arguments passed via "..." must derive from the class specified for "..." in the method signature. At some point we should solve that by introducing a binary pmin2, pmax2 as we have for cbind and rbind. On Thu, Dec 24, 2015 at 5:54 AM, Da Zheng <zhengda1936 at gmail.com> wrote: > Hello, > > I'm trying to override pmin and pmax for my own matrix. These two > functions have ... as an argument. I tried to override them as > follows: >...
2005 Dec 20
0
pmin(), pmax() - slower than necessary for common cases
...k,x) (x+k - abs(x-k))/2 pmax. <- function(k,x) (x+k + abs(x-k))/2 are probably the fastest way of computing pmin() and pmax() of two arguments {yes, they "suffer" from rounding error of about 1 to 2 bits...} currently in R. One "solution" could be to provide pmin2() and pmax2() functions based on trival .Internal() versions. The experiments below are for the special case of k=0 where I found the above mentioned factor of 19 which is a bit overoptimistic for the general case; here is my pmax-ex.R source file (as text/plain attachment ASCII-code --> easy cut &...