Hi, I'm a new R user, with a lot of questions. At the moment I'm stoped on an error traying to fit a model:> x <- sandeel ## numeric data (2500-60000) > y <- Noss ## numeric data (0-1.2) > A <- 0.8 > B <- 0.6 > C <- 1/40000 > nls( y ~ A-B*exp(-C*x))Error in match.call(definition, call, expand.dots) : .Primitive... is not a function I'm not sure if the error is due to the formula sytax or something else. I'll appreciate any help Sylvia _________________________________________________________ Do You Yahoo!? La mejor conexi??n a internet y 25MB extra a tu correo por $100 al mes. http://net.yahoo.com.mx
Anaid Diaz wrote:> Hi, > I'm a new R user, with a lot of questions. At the > moment I'm stoped on an error traying to fit a model: > > >>x <- sandeel ## numeric data (2500-60000) >>y <- Noss ## numeric data (0-1.2) >>A <- 0.8 >>B <- 0.6 >>C <- 1/40000 >>nls( y ~ A-B*exp(-C*x)) > > Error in match.call(definition, call, expand.dots) : > .Primitive... is not a function > > I'm not sure if the error is due to the formula sytax > or something else. > I'll appreciate any help > > SylviaUse nls(y ~ A -B*exp(-C*x), start = c(A = 0.8, B = 0.6, C = 1/40000)) instead or, preferably, nls(y ~ SSasymp(x, Asym, R0, lrc)) and read ?SSasymp for an interpretation of the estimated parameters.
thank you, it worked. Sylvia --- Douglas Bates <bates at stat.wisc.edu> wrote:> Anaid Diaz wrote: > > Hi, > > I'm a new R user, with a lot of questions. At the > > moment I'm stoped on an error traying to fit a > model: > > > > > >>x <- sandeel ## numeric data (2500-60000) > >>y <- Noss ## numeric data (0-1.2) > >>A <- 0.8 > >>B <- 0.6 > >>C <- 1/40000 > >>nls( y ~ A-B*exp(-C*x)) > > > > Error in match.call(definition, call, expand.dots) > : > > .Primitive... is not a function > > > > I'm not sure if the error is due to the formula > sytax > > or something else. > > I'll appreciate any help > > > > Sylvia > > Use > > nls(y ~ A -B*exp(-C*x), start = c(A = 0.8, B = 0.6, > C = 1/40000)) > > instead or, preferably, > > nls(y ~ SSasymp(x, Asym, R0, lrc)) > > and read > > ?SSasymp > > for an interpretation of the estimated parameters. >_________________________________________________________ Do You Yahoo!? La mejor conexi??n a internet y 25MB extra a tu correo por $100 al mes. http://net.yahoo.com.mx