R vector

hello,

when i use the function rowMeans, which is sum/n, can i divide it in 2
parts, -> Sum(just positive values)/n and Sum(just negative values)/n. i
need both for my regression but dont know how to do it.

for example we have the matrix

1  1  -1  -1   -> rowMeans([1:3 , 2])  just positive -> 1
1 -1 -1  -2                                                                             
1/2  here not 0 because we dont use the -1
1 1   1   1                                                                               
1


thanks for helping



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