These low-level functions provide faster alternatives to
some uses of ifelse
. They were developed by
trial-and-error comparison of computation times of different expressions.
ifelse0NA(test)
is equivalent to ifelse(test, 0, NA)
.
ifelse1NA(test)
is equivalent to ifelse(test, 1, NA)
.
ifelseAB(test, a, b)
is equivalent to ifelse(test, a, b)
where a
and b
must be single values.
ifelseAX(test, a, x)
is equivalent to ifelse(test, a, x)
where a
must be a single value, and x
a vector of the
same length as test
.
ifelseXB(test, x, b)
is equivalent to ifelse(test, x, b)
where b
must be a single value, and x
a vector of the
same length as test
.
ifelseXY(test, x, y)
is equivalent to ifelse(test, x, y)
where x
and y
must be vectors of the
same length as test
.
ifelseNegPos(test, x)
is equivalent to ifelse(test, x, -x)
where x
must be a vector of the same length as test
.