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Xiaodong Jin <close2ceo at yahoo.com> writes: >> y > [1] 1 11 42 64 108 173 214 > > > t > [1] 1 2 3 4 5 6 7 > > > nls(1/y ~ c*exp(-a*b*t)+1/b, start=list(a=0.001...
Hi, It works for me if i encapsulate the formula within a function a =1; b=1; f1 <- function(x,v,w) {a/(b+(x/v)^w)} fm2 = gnls( y ~ f1(x,v,w), start=list( v=1, w=1...
Hi Tom, first I can't see, why you think the crossing-point should be 290, look at the plot x <- seq(200, 500, 10) plot( exp(2.4591201+x/(-0.4015233+x)) ~ x, ylim=c(0,40), type="l...
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