Hi there,
I have read the help page of nls(), there is lower or upper for defining
the bounds of parameters. For example,
nls(y ~ 1-a*exp(-k1*x)-(1-a)*exp(-k2*x), data=data.1, start=list(a=0.02,
k1=0.01, k2=0.0004), upper=c(1,1,1), lower=c(0,0,0))
I hope to define k1 > k2, but I don't find a way.
Any suggestions will be really appreciated.
Regards,
Jinsong
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