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2007 Apr 19
2
Using "mean" if two values are identical
Hello,
I have got a question.
I've got a matrix (mail end) with the colnames x, y, z. In this matrix
are different measurements. x and y are risign coordinates.
My question. Always, if the "x" AND "y" coordinates are the same, I want to
get the mean of their z values.
e.q. "
x" AND "y" in line1 and line8 are identical:
29 4.5 --> mean of