hello R users, I didn't find a solution for a special problem. I have two dataframes.
dataframe1: X value row col ID 1 8.973498062 5512625 3460000 1 2 11.656658570 5501625 3464000 2 3 11.121777570 5495625 3473000 3 4 9.310465964 5508625 3477000 4 5 8.883483845 5515625 3496000 5 dataframe2: X value row col ID n 1 11.105009400 5511625 3463000 1 -619.112472616732 2 10.324148150 5499625 3465000 0 1.000000000000 3 8.744590903 5503625 3475000 0 1.000000000000 4 9.523473123 5494625 3475000 3 -578.235381588725 5 8.856097133 5507625 3480000 4 -619.112472616732 6 8.636881453 5514625 3497000 5 -140.801233634174 Now I want if column "n" in dataframe2 is greater than 0 column "ID" which is 0 is now maxium column "ID" in dataframe1 +1 and the for the second 0 maximum + 2 the finished dataframe2 should look like this: X value row col ID n 1 11.105009400 5511625 3463000 1 -619.112472616732 2 10.324148150 5499625 3465000 6 1.000000000000 3 8.744590903 5503625 3475000 7 1.000000000000 4 9.523473123 5494625 3475000 3 -578.235381588725 5 8.856097133 5507625 3480000 4 -619.112472616732 6 8.636881453 5514625 3497000 5 -140.801233634174 My idea was below: lastrow1 <- length(dataframe2[,1]) lastrow2 <- length(dataframe1[,1]) anz <- sum(dataframe2[,6] > 0) for (k in 1:anz){ for (i in 1:lastrow1){ for (j in 1:lastrow2){ if (dataframe2[i,6] > 0){ dataframe2[i,5] <- max(dataframe1[j,5])+(k-k+1) } } } } but the result is: X value row col ID n 1 11.105009400 5511625 3463000 1 -619.112472616732 2 10.324148150 5499625 3465000 6 1.000000000000 3 8.744590903 5503625 3475000 6 1.000000000000 4 9.523473123 5494625 3475000 3 -578.235381588725 5 8.856097133 5507625 3480000 4 -619.112472616732 6 8.636881453 5514625 3497000 5 -140.801233634174 R gives me the right value in the second row of "ID" with "6" but the third row of "ID" is also "6" but should be "7" any ideas? thanks! -- View this message in context: http://www.nabble.com/Substitute-problem-tp20110333p20110333.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.