[R] Function modification: how to calculate values for every combination?

[Erich Neuwirth]

outer(x,y,fun)

Lauri Nikkinen wrote:
> Hello,
> 
> I have a function like this:
> 
> fun <- function (x, y) {
>           a <- log(10)*y
>           b <- log(15)*x
>           extr <- a-b
>           extr
>           }
> 
> fun(2,3)
> [1] 1.491655
> 
> x <- c(1,2,3)
> y <- c(4,5,6)
> fun(x, y)
> [1] 6.502290 6.096825 5.691360
> 
> How do I have to modify my function that I can calculate results using
> every combination of x and y? I would like to produce a matrix which
> includes the calculated values in every cell and names(x) and names(y)
> as row and column headers respectively. Is the outer-function a way to
> solution?
> 
> Best regards,
> Lauri
> 
> ______________________________________________
> R-help at 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.
> 
> 


-- 
Erich Neuwirth, University of Vienna
Faculty of Computer Science
Computer Supported Didactics Working Group
Visit our SunSITE at http://sunsite.univie.ac.at
Phone: +43-1-4277-39464 Fax: +43-1-4277-39459