Hello,
I don't know if this is what you want, but your formula is equivalent to
nlstest=nls(Cfl~K*ifelse(Pw > z, 1, exp(-a*Tsoil))*exp(-b*Pw)+c
,start=c(K=5.5, a=0.1, b=0.1, c=2, z=5))
Hope this helps,
Rui Barradas
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