Computes the colwise means or variances of a matrix - internal use
matrix of type: matrix or dgCMatrix
boolean, defines whether the colwise variances rather than the means will be returned
Numeric Vector of colwise means or variances of X
X <- matrix(rnorm(1000*500),1000,500)
means <- ccolmv(X)
vars <- ccolmv(X,compute_var=TRUE)
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