Hello!
I am trying to write a function with vector and data.frame parameters that
uses the sum() function and values from the rows of the data.frame.
I need to pass this function as a parameter to optim().
My starting point is:
observs <- data.frame(y, x1, x2, x3)
Fn <- function(par, observs) {
sum( (y - (par[1] * (x1 + 1) * x2^(-par[2]) * x3^par[3])^2 )
}
y, x1, x2, x3 are all vectors.
I am a bit new to R and I have not been able to find a good description of
how to iterate over rows in a data.frame.
What is a straightforward way to do this?
What am I missing?
Thanks
Stu
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org 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.
