[R] Warning Message: In if (deparse(params[[nm]][[3]]) != "1")

[obuyacharles]

I am using the gnls procedure in nlme package to fit a nonlinear model as:
nl.fit<-gnls(Y ~ b0*exp(b1/X),
                  data = data1,
                  params=list(
                 b0~p1+I(p1^2)+p2+I(p2^2)+p3+I(p3^2)+p5+p6
                 b1~p8+p2+I(p2^2)+p3+p9+p10+p11),
                 start = c(25,0,0,0,0,0,0,0,0,-8.6,0,0,0,0,0,0,0),
                 weights=varPower(form =~ X)
                 )

When I run this code, the model getts fitted but there are 2 warning
messages as
Warning messages:
1: In if (deparse(params[[nm]][[3]]) != "1") { :
  the condition has length > 1 and only the first element will be used
2: In if (deparse(params[[nm]][[3]]) != "1") { :
  the condition has length > 1 and only the first element will be used

I have no idea what there messages imply.
Any idea from somebody?

Charles




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