I have 1 data frame "Data" with my main data points (red points: latitude, longitude and other biological parameters) and 3 other data frames for each blue line "front_x" (latitude, longitude). I need to sort the data (red points) according to these lines of points, so one file for each 4 different zones. I suppose I need to do a for loop, and according to the latitude and the longitude of each data point... Can someone help me to establish the code? http://r.789695.n4.nabble.com/file/n4333435/Data_front.png -- View this message in context: http://r.789695.n4.nabble.com/sorting-data-according-to-different-boundaries-tp4333435p4333435.html Sent from the R help mailing list archive at Nabble.com.