Created
August 30, 2013 11:02
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run R function on certain columns of data frame and then paste the result to the whole data frame
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| time_spent <- function(from,to) { | |
| op <- options(digits.secs = 3) | |
| x<-as.numeric((strptime(to, "%Y-%m-%d %H:%M:%OS")-strptime(from, "%Y-%m-%d %H:%M:%OS")),units="secs") | |
| data.frame(time_spent=x) | |
| } | |
| dane_evaluations<-data.frame(dane_evaluations,time_spent=apply(dane_evaluations[,c('documentevaluation_start','documentevaluation_end')],1,function(x) time_spent(x[1], x[2]))) |
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