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fldd
2005 Sep 26
2
nls and na/Nan/Inf error
...(1-1/lamda))
}
vanGen <- deriv(~Vr + (Vm - Vr)/((1+(alpha*x)^lamda)^(1-1/lamda)),
c("Vr", "Vm", "alpha", "lamda"), function(x, Vr, Vm, alpha, lamda) {} )/
the call in R
/> fm1fld.nls <- nls(Moisture ~ vanGen(Suction, Vr,Vm,alpha,lamda),
+ data=fldgd, start=c(Vr=0.229, Vm=0.433, alpha=0.2, lamda=1.5))
/and the data:/
/* Suction Moisture
1 0 0.433
2 1 0.421
3 4 0.400
4 10 0.379
5 20 0.366
6 30 0.362
7 40 0.358
8 50 0.353
9 60 0.351
10 70 0.349
*/
/can...