aqp (version 2.2)

hz_lag: 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
)

Value

A data.frame with lagged values.

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 #'

Author

Stephen Roecker

Details

.

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)
)