system.time {base} | R Documentation |
Return CPU (and other) times that expr
used.
system.time(expr) unix.time(expr)
expr |
Valid R expression to be ``timed'' |
system.time
calls the builtin proc.time
,
evaluates expr
, and then calls proc.time
once more,
returning the difference between the two proc.time
calls.
The values returned by the proc.time
are (on Unix) those
returned by the C library function times
(3v).
unix.time
is an .Alias
of system.time
, for
compatibility reasons.
A numeric vector of length 5 containing the user cpu, system cpu, elapsed, subproc1, subproc2 times. The subproc times are the the user and system cpu time used by child processes (and so are usually zero).
proc.time
, time
which is for time series.
system.time(for(i in 1:50) mad(runif(500))) exT <- function(n = 100) { # Purpose: Test if system.time works ok; n: loop size system.time(for(i in 1:n) x <- mean(rt(1000, df=4))) } #-- Try to interrupt one of the following (using Ctrl-C): exT() #- `1.4' on -O-optimized Ultra1 system.time(exT()) #~ +/- same