get.increase.matrix {aqp} | R Documentation |
Uses matrix outer product to determine all pair-wise differences in attr
for the horizons of p
. Supplies attr
to threshold.fun
to determine the
minimum value criterion to return TRUE in output matrix for an "increase".
Also, computes all pair-wise distances in depth dimension to determine
whether the vertical distance criteria have been met simultaneously with
attr
increase.
get.increase.matrix(p, attr, threshold.fun, vertical.distance)
p |
a SoilProfileCollection, containing a single profile |
attr |
horizon attribute name to get the "increase" of |
threshold.fun |
a function that returns the threshold (as a function of attr); may return a constant single value |
vertical.distance |
the vertical distance (determined from difference SPC top depth variable) within which increase must be met |
This function assumes that the threshold.fun
supplied by the user returns
either a constant or a vector of equal length to its input.
Note that the threshold.fun
result is allowed to contain NA, but that will
result in no output for affected cells.
get.increase.depths
performs the conversion of the square matrix
output of get.increase.matrix
back to horizon top depth for where
criteria were met.
Returns a square logical matrix reflecting where the increase criteria were met.
get.increase.depths
converts to horizon dop depth by using above
matrix output to determine depths where increase is met.
Andrew Gene Brown
getArgillicBounds
, crit.clay.argillic
data(sp1, package = 'aqp') depths(sp1) <- id ~ top + bottom site(sp1) <- ~ group p <- sp1[1] attr <- 'prop' # clay contents foo <- get.increase.matrix(p, threshold.fun = crit.clay.argillic, attr = attr, vertical.distance = 30) foo