I would like to apply the following function to the rows of the matrix
"mat", so that freq[1],...,freq[4] are the four elements of each row.
min_chi2<-function(freq){
obj<-function(x){
(freq[1]-(1-x[1])*(1-x[2])-x[3]*sqrt(x[1]*(1-x[1])*x[2]*(1-x[2])))^2/freq[1]+
(freq[2]-(1-x[1])*x[2]+x[3]*sqrt(x[1]*(1-x[1])*x[2]*(1-x[2])))^2/freq[2]+
(freq[3]-x[1]*(1-x[2])+x[3]*sqrt(x[1]*(1-x[1])*x[2]*(1-x[2])))^2/freq[3]+
(freq[4]-x[1]*x[2]-x[3]*sqrt(x[1]*(1-x[1])*x[2]*(1-x[2])))^2/freq[4]
}
optim(c(0.1,0.1,0.1),obj,NULL,method="BFGS")$par
}
mat<-matrix(c(0.4,0.1,0.1,0.4), byrow=TRUE, nrow=10, ncol=4)
Questions:
1. How to do this using the "apply" function?
2. Can "opmit" be used directly, i.e. without needing to define the
function "min_chi2"?
3. How to pass the vector of initial conditions (c(0.1,0.1,0.1)) as an
argument to "apply"?
The output should be a 10x3 matrix containing 0.5 0.5 0.6 in each row.
Thanks a lot,
Serguei
--
___________________________________________________________________
Austrian Institute of Economic Research (WIFO)
Name: Serguei Kaniovski P.O.Box 91
Tel.: +43-1-7982601-231 Arsenal Objekt 20
Fax: +43-1-7989386 1103 Vienna, Austria
Mail: [EMAIL PROTECTED]
http://www.wifo.ac.at/Serguei.Kaniovski
______________________________________________
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.
