In R, how do I get all possible combinations of the values of some vectors?

Question

The background: I have a function which takes some parameters. I want to have the result of the function for all possible parameter combinations.

A simplified example:

Answer 1

I think you just want expand.grid:

> colors = c("red", "green", "blue") 
> days = c("Monday", "Tuesday") 
> expand.grid(colors,days)
   Var1    Var2
1   red  Monday
2 green  Monday
3  blue  Monday
4   red Tuesday
5 green Tuesday
6  blue Tuesday

And, if you want to specify the column names in the same line:

> expand.grid(color = colors, day = days)
  color     day
1   red  Monday
2 green  Monday
3  blue  Monday
4   red Tuesday
5 green Tuesday
6  blue Tuesday