[R-sig-Geo] error in indicator variogram

[adeela uaf]

Hi memebers,

I am trying to do indicator kriging, so, fitting indicator variogram.

c1 <- ifelse(mt$Cd15 > 0.34, 1 , 0)

q <- gstat(id="c1", formula=c1~1,  data=mt)

v.fit <- fit.variogram(variogram(q), vgm(psill=0.2,"Wav",nugget=0,
range=12))

plot(variogram(q),v.fit)

but receiving a vary poor model fit. On any other model and parameter
values receiving this error
Warning message:
In fit.variogram(variogram(q), vgm(psill = 0.2, "Sph", nugget = 0,  :
  Warning: singular model in variogram fit

Regards

Adeela
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