Hello, everyone, I have a specific equation, When I draw it out, I found there is a max. value for it at about x=5. but I couldn't point it out by optimize(). Does anyone know why? Thanks!
my code is: d50<-18.04 c<- -1.276 dm<-147 sm <- function (x) { 1/(1+(x/d50)^c)+(1-1/(1+(dm/d50)^c))*x/dm-(1/(1+((x-1)/d50)^c)+(1-1/(1+(dm/d50)^c))*(x-1)/dm) } curve(sm, 0,50) optimize(sm,c(0,50)) The optimize() only give min. value but not max. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.