Exploring a matrix’s parameters in r: colSums, rowSums, colMeans, rowMeans, cbind, rbind.
ColSums() returns the sum for each column in your data structure. The only argument you need to pass is your data.
Just as it was with colnames() and rownames(), and cbind() and rbind(), there is a corresponding rowSums() function in R, too. It returns the sum for each row in a matrix.
ColMeans() gives us the means for all columns in our matrix, and rowMeans() returns the averages of the rows in a matrix.
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