hz_lag: Find lagged horizon values

In aqp: Algorithms for Quantitative Pedology

Find lagged horizon values

Description

This function finds adjacent values to a horizon values at lagged distances.

Usage

hz_lag(
  object,
  lag = 1,
  unit = "index",
  idcol = "id",
  depthcols = c("top", "bottom"),
  order = FALSE
)

Arguments

object	a data.frame
lag	integer: number of horizons to lag
unit	character: lag units in index or depth.
idcol	character: column name of the pedon ID within the object.
depthcols	a character vector of length 2 specifying the names of the horizon depths (e.g. c("top", "bottom")).
order	logical: indicating whether or not to order the #'

Details

.

Value

A data.frame with lagged values.

Author(s)

Stephen Roecker

See Also

hz_dissolve(), hz_intersect(), hz_segment()

Examples

h <- data.frame(
  id = 1,
  top    = c(0,  25, 44, 46, 50),
  bottom = c(25, 44, 46, 50, 100),
  texcl     = c("SL", "SL", "CL", "CL", "L"),
  clay   = c(10, 12, 27, 35, 16)
)

hz_lag(h)

hz_lag(h, -1)

hz_lag(h, 10:15, unit = "depth")

transform(cbind(h, lag = hz_lag(h)), 
  clay_dif = lag.clay_bot.1 - clay,
  texcl_contrast = paste0(texcl, "-", lag.texcl_bot.1)
)

aqp documentation built on Oct. 19, 2024, 5:06 p.m.