Self-Starting Nls Load Bearing Capacity Model
A selfStart model that evaluates the Load Bearing Capacity
(Dias Jr., 1994) function and its gradient. It has an initial attribute
that creates initial estimates of the parameters b0 and b1.
SSlbc(theta, b0, b1)
theta |
a numeric vector of soil moisture values at which to evaluate the model. |
b0 |
a numeric parameter. |
b1 |
a numeric parameter. |
a numeric vector with the same length of theta. It is the value of the
expression 10^{(b0 + b1 * θ)}. Also, the gradient matrix with respect
to the parameters is attached as an attribute named gradient.
Anderson Rodrigo da Silva <anderson.agro@hotmail.com>
Dias Junior, M. S. (1994). Compression of three soils under longterm tillage and wheel traffic. 1994. 114p. Ph.D. Thesis - Michigan State University, East Lansing.
data(compaction) attach(compaction) ss <- SSlbc(Mois, 2.79, -2.33) ss[1:50] # prediction PS # original data of preconsolidation stress ss # prediction and gradient # End (not run)
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