Following problem:
Say you have a bunch of parameters and want to produce results for all
combinations of those:
height<-c("high","low")
width<-c("slim","wide")
then what i used to do was something like this:
l<-list()
for(h in height){
l[[h]]<-list()
for(w in width){
l[[h]][[w]] <- doSomething()
}
}
Now those parameters aren't always the same. Their number can change and the
number of entries can change, and i'd like to have one code that can handle all
configurations.
Now i thought i could use expand.grid() to get all configurations ,and than
iterate over the rows, but the problem then is that i cannot set the values in
the list like above.
grid<-expand.grid(height,width)
l[[as.character(grid[1,])]] <-1
Error in `[[<-`(`*tmp*`, as.character(grid[1, ]), value = 1) :
no such index at level 1
This will only work if the "path" for that is already existent, and i'm not
sure how to build that in this scenario.
I then went on and built an array instead lists of lists, but that doesn't help
either because i can't access the array with what i have in the grids row - or
at least i don't know how.
Any ideas?
I'd prefer to keep the named lists since all other code is built towards this.
______________________________________________
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.
