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2013 Jan 12
1
How to extract value for specific rows in an array?
...pth <- 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[MaxDepth[i]] ### NOT WORKING... } Another way to do this, since I am getting o...