prob (version 0.9-1)

isrep: Is Repeated in a Vector

Description

Tests for a certain number of repetitions of vals in a given vector x.

Usage

isrep(x, ...)

## S3 method for class 'default':
isrep(x, vals = unique(x), nrep = 2,  ...)

## S3 method for class 'data.frame':
isrep(x, \dots)

Arguments

x

an object with potential repeated values.

vals

values that may be repeated.

nrep

exact number of repeats desired, defaults to pairs.

...

further arguments to be passed to or from other methods.

Value

• Logical.

Details

This is a generic function, with methods supplied for data frames and vectors. The default behavior tests for existence of pairs of elements of x. One can test existence of triples, etc., by changing the nrep argument. If there are specific values for which one is looking for repeats, these can be specified with the vals argument. Note that the function only checks for exactly nrep instances, so two pairs of a specific element would be counted as 0 pairs and 1 quadruple. See the examples. The data frame method uses apply to apply isrep.default to each row of the data frame.

See Also

countrep

Examples

x <- c(3,3,2,2,3,3,4,4)
isrep(x)  # one pair each of 2s and 4s
isrep(x, nrep = 4) 
isrep(x, vals = 4) # one pair of 4s