Hi list,

Thank you vey much for reading this post.

I have a data frame, I am trying to split it into a couple of data frame using one of the columns, say, x. After I get the data frames, I am planning to treat them as matrices and trying to calculate an element by element mean matrix. Could anyone give me some advice how to do it?

So far, I know that if I have a couple of matrices, say data1,data2,data3,data4...dataN, I can do it like this:

data=array(cbind(data1,data2,data3,data4,....dataN), c(2, 3, N))
#2 refers to row number of matrix, 3 refers to column number of matrix, N refers to number of matrices to be averaged.
meanmtrx=apply(data,1:2,mean)

but I do not know how to use the resulting data frames with cbind(). Maybe there are other better ways. Any advice is appreciated.

Thank you very much.

Have a nice day.

ya 
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