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Random Numbers Summing to 1

Source: R/rSum21.R
rSum21.Rd

Generates a vector of random proportions that sum exactly to 1.

Usage

rSum21(size, digits = NULL)

Arguments

size

integer. The number of values to generate.

digits

integer. If not NULL (default), the values are rounded to this number of decimal places while preserving the sum of 1.

Value

a numeric vector of length size summing to 1.

Details

The values are drawn from a uniform distribution and normalized by their sum. If digits is given, the values are rounded and the rounding error is assigned to the largest element, which is then rounded again to the requested precision. Note that for very coarse rounding the exact-sum guarantee may not be attainable at the given precision.

See also

Other random.numbers: rBetaShape()

Examples

x <- rSum21(5)
sum(x)
#> [1] 1

x <- rSum21(5, digits = 2)
sum(x)
#> [1] 1