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dayindex2
2013 Jan 12
1
How to extract value for specific rows in an array?
...days<- nrow(DF)/samplesperday # number of days in the dataset (5 here)
MaxDepth <- array(NaN,c(nbdays,1)) # create empty array where max depth
values will be stored
Date <- array(NaN,c(nbdays,1)) # create empty array where date for max
depth values will be stored
for (i in 1:nbdays){
dayIndex1 <- samplesperday*(i-1)+1 # start of day period (value 1 of 2880)
dayIndex2 <- samplesperday*(i) # end of day period (value 2880 of 2880)
MaxDepth[i] <- max(DF$depth[dayIndex1:dayIndex2]) # extract max depth
value from the 2880 datapoints collected per day
Date [i] <- DF$date[...