Returns a matrix of integers indicating their column number in a matrix-like object, or a factor of column labels.
a matrix-like object, that is one with a two-dimensional
a matrix dimension, i.e.,
a logical value indicating whether the value should be returned as a factor of column labels (created if necessary) rather than as numbers.
An integer (or factor) matrix with the same dimensions as
x and whose
ij-th element is equal to
j (or the
j-th column label).
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
row to get rows;
slice.index for a general way to get slice indices
in an array.
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