search for: 28urgent

.....){ v=exp(a0+a1*(x/s)+a2*(x/s)^2) GBSOption(TypeFlag=c("c"),S=s,X=x,Time=t,r=0,b=0,sigma=v)@price } When I use this one, it returns the error similar to the upper one. Please help me, many thanks. Ted -- View this message in context: http://www.nabble.com/error-in-function%3A-nls--%28urgent%29-tp20558499p20558499.html Sent from the R help mailing list archive at Nabble.com.