[R] access to right time unit when checking for time execution

[Uwe Ligges]

On 15.01.2011 12:57, Christine SINOQUET wrote:
> Hello,
>
> I really wonder how to distinguish between secs and mins in the example
> below.
>
> In other terms, how can I access the time unit in variable d ?
>
> start1 <- Sys.time();
> stop1 <- Sys.time(); d <- stop1-start1; print(d);
> v<-unlist(strsplit(as.character(d), split=" ")); print(v)
> Time difference of 3.024054 secs
> [1] "3.02405381202698"
 >
> stop1 <- Sys.time(); d <- stop1-start1; print(d);
> v <- unlist(strsplit(as.character(d), split=" ")); print(v)
> Time difference of 3.189143 mins
> [1] "3.18914334774017"



1. If you want to measure execution time, use system.time().
2. If you want to calculate a time difference, use difftime() and 
specify the unit:
difftime(stop1, start1, units="mins")

Best,
Uwe Ligges







>
> Thank you in advance for your kind help.
>
> C.S.
>
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