Hello, I have got two matrices with different length. The matrices have 3 columuns. The first two are coordinates. The third is a measurement.
Now I want to get a subtraction between every single value of the third column (between matrix1 and matrix2), but only if the two first coordinates in matrix1 and matrix2 are the same. I tried "FUN=?" in aggregate and ave, but I don't know the command for such a subtraction? Thank's a lot. Felix --------------- The matrixes (examlple): 1 0.1 0.0042 1 0.2 0.00423 1 0.4 0.00467 1 0.5 0.00518 1 0.6 0.0061 1 0.1 0.0043 1 0.2 0.00442 1 0.3 0.00433 1 0.4 0.0045 1 0.5 0.00524 1 0.7 0.006 My aim: ------- 1 0.1 -0.0001 1 0.2 -0.00019 1 0.4 0.00017 1 0.5 -0.00006 ______________________________________________ [email protected] 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.
