sum {base} | R Documentation |
sum
returns the sum of all the values
present in its arguments.
sum(..., na.rm = FALSE)
... |
numeric or complex or logical vectors. |
na.rm |
logical. Should missing values (including |
This is a generic function: methods can be defined for it
directly or via the Summary
group generic.
For this to work properly, the arguments ...
should be
unnamed, and dispatch is on the first argument.
If na.rm
is FALSE
an NA
or NaN
value in
any of the arguments will cause a value of NA
or NaN
to
be returned, otherwise NA
and NaN
values are ignored.
Logical true values are regarded as one, false values as zero.
For historical reasons, NULL
is accepted and treated as if it
were integer(0)
.
Loss of accuracy can occur when summing values of different signs: this can even occur for sufficiently long integer inputs if the partial sums would cause integer overflow. Where possible extended-precision accumulators are used, but this is platform-dependent.
The sum. If all of ...
are of type integer or logical, then
the sum is integer, and in that case the result will be NA
(with a
warning) if integer overflow occurs. Otherwise it is a length-one
numeric or complex vector.
NB: the sum of an empty set is zero, by definition.
This is part of the S4 Summary
group generic. Methods for it must use the signature
x, ..., na.rm
.
‘plotmath’ for the use of sum
in plot annotation.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
colSums
for row and column sums.