| Sys.sleep {base} | R Documentation |
Suspend Execution for a Time Interval
Description
Suspend execution of R expressions for a given number of seconds
Usage
Sys.sleep(time)
Arguments
time |
The time interval to suspend execution for, in seconds. |
Details
Using this function allows R to be given very low priority and hence not to interfere with more important foreground tasks. A typical use is to allow a process lauched from R to set itself up and read its input files before R execution is resumed.
The intention is that this function suspends execution of R expressions but wakes the process up often enough to respond to GUI events, typically every 0.5 seconds.
There is no guarantee that the process will sleep for the whole of the specified interval, and it may well take slightly longer in real time to resume execution. The resolution of the time interval is system-dependent, but will normally be down to 0.02 secs or better.
Value
Invisible NULL.
Note
This function is not implemented on all systems.
Author(s)
B. D. Ripley
Examples
testit <- function(x)
{
p1 <- proc.time()
Sys.sleep(x)
proc.time() - p1 # The cpu usage should be negligible
}
testit(3.7)