Hi, I am trying to write a function with the following codes and I would like it to return the values for "alpha beta para parab " seperately. Then I would like to use this funstion for "variable" with factor "a" and "b". But the result turns out to be a matrix with element like "Numeric,2" ... I guess they are just the values for "parab", and we can not even see the two parameters in parab.
parameter <- function(v) { v1 <- v[v>mean(v)+0.5*sd(v)] v2 <- v[v<mean(v)-0.5*sd(v)] alpha=min(v1) beta=max(v2) para <- fitgpd(v1,alpha, method="pwmu")$param parab <- fitgpd((-v2), (-beta), method="pwmu")$param v1.fit <- qgpd(ppoints(v1, a=0.5), alpha, para[1], para[2]) v2.fit <- qgpd(ppoints((-v2), a=0.5), (-beta), para[1], para[2]) alpha beta para parab } tapply(variable, list(a, b),parameter) I would be grateful if anyone can give me some advice. Many thanks -- View this message in context: http://www.nabble.com/Function--return-value-tf3947134.html#a11197159 Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@stat.math.ethz.ch mailing list 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.