Interpolate a characteristic diameter from a grain-size distribution

Returns the diameter at which N percent of the sample (by mass) is finer, using log-linear interpolation. Extrapolation is used when N falls outside the range of percent, with a warning.

Usage

Dsize(N, sieve = NA, size = NA, percent, metric = T)

Arguments

N

Numeric. The desired percent-finer value (e.g. 10, 30, or 60).

sieve

Numeric vector of ASTM sieve numbers. Used to derive size when size is NA. Default NA.

size

Numeric vector of particle sizes corresponding to percent. Default NA.

percent

Numeric vector of percent passing values (0–100).

metric

Logical. If TRUE (default) size is in millimetres.

Value

A single numeric value: the particle diameter at N percent passing.

Details

This function is taken from the "geotech" package from James Kaklamanos

See also

Other soil mechanics, classification: USCS(), USCS.coarse.symbol(), USCS.fine.symbol(), grainSize.coefs(), percentComponents(), size.from.sieve()

Examples

Dsize(
  N       = 60,
  percent = c(0, 10, 30, 60, 90, 100),
  size    = c(0.075, 0.15, 0.3, 0.6, 1.18, 2.36)
)
#> [1] 0.6