Find Maximum Position in Matrix

Description

Find the maximum position for each row of a matrix, breaking ties at random.

Usage

max.col(m)

Arguments

Details

Ties are broken at random. The determination of ``tie'' assumes that the entries are probabilities: there is a relative tolerance of 1e-5, relative to the largest entry in the row.

Value

index of a maximal value for each row, an integer vector of length nrow(m).

Author(s)

W. N. Venables and B. D. Ripley

References

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. New York: Springer (4th ed).

See Also

which.max for vectors.

Examples

data(swiss)
table(mc <- max.col(swiss))# mostly "1" and "5", 5 x "2" and once "4"
swiss[unique(print(mr <- max.col(t(swiss)))) , ] # 3 33 45 45 33 6