Dear list.
I am student M.S. statistics in department statistics .I have thise problem in
work with the function variofit and nls and dont know how to solve it.
var1<-variog(data,option="bin")
var2<-variog(data,option="cloud")
v1<-var1$v
u1<-var1^u
v2<-var2$v
u2<-var2$u
variofit(var1,ini.cov.pars=c(0.005,1.5),cov.model="power",fix.nugget=F,weight="equal")
variofit: weights used: equal
variofit: minimisation function used: optim
Error in if (loss > (.Machine$double.xmax^0.5) | loss == Inf | loss == :
missing value where TRUE/FALSE needed
In addition: Warning message:
unreasonable initial value for sigmasq + nugget (too low) in: variofit(var1,
ini.cov.pars = c(0.005, 1.5), cov.model = "power",
.......................................................................................................................
variofit(var2,ini.cov.pars=c(0.005,1.5),cov.model="power",fix.nugget=F,weight="equal")
variofit: weights used: equal
warning: minimisation function nls can not be used with given cov.model.
changing for "optim".
variofit: minimisation function used: optim
Error in if (loss > (.Machine$double.xmax^0.5) | loss == Inf | loss == :
missing value where TRUE/FALSE needed
In addition: Warning message:
In variofit(var2, ini.cov.pars = c(0.005, 1.5), cov.model = "power", :
unreasonable initial value for sigmasq + nugget (too low)
...............................................................................................................................
nls(v2~c0+ce*(1-exp(-(u2^2)/(ae^2))),start=list(c0=0,ae=30000,ce=20000))
Error in nls(v2 ~ c0 + ce * (1 - exp(-(u2^2)/(ae^2))), start = list(c0 = 0, :
number of iterations exceeded maximum of 50
best regards.
Sadeghian.
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