ifelse1: Conditional Data Selection

Description Usage Arguments Details Value See Also Examples


This is equivalent to {if(test) x else y} . The main advantage of using this function is better formatting, and a more natural syntax when the result is being assigned; see examples below.

With 5 arguments, this is equivalent to {if(test1) x else if(test2) u else v} (where arguments are given by name, not position).


ifelse1(test, x, y, ...)



logical value; if TRUE return x.


any object; this is returned if test is TRUE.


any object; this is returned if test is FALSE.


there should be 3, 5, 7, etc. arguments to this function; arguments 1, 3, 5, etc. should be logical values; the other arguments (even numbered, and last) are objects that may be returned.


test should be a scalar logical, and only one of x or y is evaluated, depending on whether test = TRUE or test = FALSE, and x and y may be any objects. In contrast, for ifelse, test is normally a vector, both x and y are evaluated, even if not used, and x and y are vectors the same length as test.


with three arguments, one of x or y. With k arguments, one of arguments 2, 4, ..., k-1, k.

See Also

ifelse, if.


ifelse1(TRUE, "cat", "dog")
ifelse1(FALSE, "one", FALSE, "two", "three")

splus2R documentation built on May 20, 2017, 1:56 a.m.

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