fitsoilwater | R Documentation |
An interactive graphical adjustment of the soil water retention curve via van Genuchten's (1980) formula. The nonlinear least-squares estimates can be achieved taking the graphical initial values.
fitsoilwater(theta, x, xlab = NULL, ylab = NULL, ...)
theta |
a numeric vector containing the values of soil water content. |
x |
a numeric vector containing the matric potential values. |
xlab |
a label for the x axis; if is NULL, the label "Matric potential" is used. |
ylab |
a label for the y axis; if is NULL, the label "Soil water content" is used. |
... |
further graphical arguments; see |
A plot of theta
versus x
and the curve of the current fitted model
according to the adjusted parameters in an external interactive panel.
Pressing the button "NLS estimates" a nls
summary of the
fitted model is printed on console whether convergence is achieved, otherwise
a warning box of "No convergence" is shown.
Anderson Rodrigo da Silva <anderson.agro@hotmail.com>
Genuchten, M. T. van. (1980). A closed form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Science Society of America Journal, 44:892-898.
nls
, soilwater
# Liu et al. (2011) h <- c(0.001, 50.65, 293.77, 790.14, 992.74, 5065, 10130, 15195) w <- c(0.5650, 0.4013, 0.2502, 0.2324, 0.2307, 0.1926, 0.1812, 0.1730) fitsoilwater(w, h) # End (not run)
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