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str_to_millis
2007 Oct 08
2
Applying function to data.frame
Hi,
If I have the following data.frame
>y
time val
1 08:00:05.834 1
2 08:03:13.345 2
3 08:10:12.443 3
>
and the following function which converts the time string to the number
of milliseconds since midnight
> str_to_millis
function( s )
{
a <- as.numeric( unlist( strsplit(s,":",fixed="TRUE") ) )
m <- a[1]*3600000 + a[2]*60000 + a[3]*1000
}
Then to get the time into millis since midnight I am doing this
> transform( y, time=str_to_millis( as.character(time) ) )
time val
1 2880583...