On 01-05-2014, at 08:44, Marc Girondot <marc_...@yahoo.fr> wrote:
> Dear list-members,
>
> Can someone explains me why the last command gives an error. Thanks a lot:
> > outer(0:1, 0:1, FUN=function(x, y) {x+y})
> [,1] [,2]
> [1,] 0 1
> [2,] 1 2
> > outer(0:1, 0:1, FUN=function(x, y) {x})
> [,1] [,2]
> [1,] 0 0
> [2,] 1 1
> > outer(0:1, 0:1, FUN=function(x, y) {1})
> Erreur dans outer(0:1, 0:1, FUN = function(x, y) { :
> dims [produit 4] ne correspond pas à la longueur de l'objet [1]
>
> Of course I simplify a lot my problem.
As the documentation for outer says the function arguments x and y are vectors
not scalars.
Try this to see that
outer(0:1, 0:1, FUN=function(x, y) {print(x);x})
outer(0:1, 0:1, FUN=function(x, y) {print(x);print(y);x})
You are returning a scalar whereas outer expects the function to return a
vector of the correct length.
A possible solution would be
outer(0:1, 0:1, FUN=function(x, y) {1+0*x})
outer(0:1, 0:1, FUN=function(x, y) {rep(1,length(x))})
Berend
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