data.table (version 1.10.0)

between: Convenience functions for range subsets.

Description

Intended for use in i in [.data.table.

between is equivalent to x >= lower & x <= upper<="" code=""> when incbounds=TRUE, or x > lower & y < upper when FALSE.

inrange checks whether each value in x is in between any of the intervals provided in lower,upper.

Usage

between(x, lower, upper, incbounds=TRUE)
x %between% y
inrange(x, lower, upper, incbounds=TRUE)
x %inrange% y

Arguments

x

Any orderable vector, i.e., those with relevant methods for `<=`< code="">, such as numeric, character, Date, etc. in case of between and a numeric vector in case of inrange.

lower

Lower range bound.

upper

Upper range bound.

y

A length-2 vector or list, with y[[1]] interpreted as lower and y[[2]] as upper.

incbounds

TRUE means inclusive bounds, i.e., [lower,upper]. FALSE means exclusive bounds, i.e., (lower,upper).

It is set to TRUE by default for infix notations.

Value

Logical vector as the same length as x with value TRUE for those that lie within the specified range.

Details

From v1.9.8+, between is vectorised. lower and upper are recycled to length(x) if necessary.

non-equi joins were recently implemented in v1.9.8. It extends binary search based joins in data.table to other binary operators including >=, <=,>, <. inrange makes use of this new functionality and performs a range join.

See Also

data.table, like, %chin%

Examples

X = data.table(a=1:5, b=6:10, c=c(5:1))
X[b %between% c(7,9)]
X[between(b, 7, 9)] # same as above
# NEW feature in v1.9.8, vectorised between
X[c %between% list(a,b)]
X[between(c, a, b)] # same as above
X[between(c, a, b, incbounds=FALSE)] # open interval

# inrange()
Y = data.table(a=c(8,3,10,7,-10), val=runif(5))
range = data.table(start = 1:5, end = 6:10)
Y[a %inrange% range]
Y[inrange(a, range$start, range$end)] # same as above
Y[inrange(a, range$start, range$end, incbounds=FALSE)] # open interval