Dear All
 
I have the following code:
 
datetime <-c("1/1/13 00:00","1/1/13 12:00","1/2/13 00:00","1/2/13 12:00")
datetime <-as.POSIXct(datetime,format='%m/%d/%Y %H:%M')
times <-matrix(c(difftime(datetime[2],datetime[1],units="hours"),difftime(datetime[3],datetime[2],units="hours"),difftime(datetime[4],datetime[3],units="hours")))

I would like to aks for some directions on how to make the 'times' object code a bit more "uniform" to accept differenth lenths of 'datetime'... Occasionally I have the 'datetime' object include up to 15 date and time points, but that code limits the system from accepting a longer 'datetime' object. This is what that looks like (basically same as above, but much longer): 
 
datetime <-c("1/1/13 00:00","1/1/13 12:00","1/2/13 00:00","1/2/13 12:00")
datetime <-as.POSIXct(datetime,format='%m/%d/%Y %H:%M')
times <-matrix(c(difftime(datetime[2],datetime[1],units="hours"),difftime(datetime[3],datetime[2],units="hours"),difftime(datetime[4],datetime[3],units="hours"),difftime(datetime[5],datetime[4],units="hours"),difftime(datetime[6],datetime[5],units="hours"),difftime(datetime[7],datetime[6],units="hours"),difftime(datetime[8],datetime[7],units="hours"),difftime(datetime[9],datetime[8],units="hours"),difftime(datetime[10],datetime[9],units="hours"),difftime(datetime[11],datetime[10],units="hours"),difftime(datetime[12],datetime[11],units="hours"),difftime(datetime[13],datetime[12],units="hours"),difftime(datetime[14],datetime[13],units="hours"),difftime(datetime[15],datetime[14],units="hours"),difftime(datetime[16],datetime[15],units="hours")))

appreciate the help,
 
Andras
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