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Hello, 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. With the following line I got the median value of z for all "x" AND "y" witch are the same (not every measurment in my list hast the same number of "x" and "y" values. Sometimes lines are missing. >MEDIAN <-

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

Hello, I have got a numeric matrix with three colums of a few measurments. My x and y coordinates are rising numbers. The z coordinate is the measurment. In my matrix if have got ~6000 sorted values for one measurments multiplied with the number of measurments. An example in the end. My aim is to get the "mean values" and "standard deviation" for each value between the