Generic function for the (trimmed) arithmetic mean.
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An R object. Currently there are methods for
numeric/logical vectors and date,
date-time and time interval objects. Complex vectors
are allowed for
the fraction (0 to 0.5) of observations to be
trimmed from each end of
a logical value indicating whether
further arguments passed to or from other methods.
trim is zero (the default), the arithmetic mean of the
x is computed, as a numeric or complex vector of
length one. If
x is not logical (coerced to numeric), numeric
(including integer) or complex,
NA_real_ is returned, with a warning.
trim is non-zero, a symmetrically trimmed mean is computed
with a fraction of
trim observations deleted from each end
before the mean is computed.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
colMeans for row and column means.
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