[R] How to get the input of a function right?

[stella]

Hi,

I wrote a function with three inputs fun(x,y,z).

x is a matrix of three vectors combined with cbind. e.g.

x1<-(1,2,3,4)
x2<-(2,3,4,5)
x3<-(3,4,5,6)

x<-cbind(x1,x2,x3)

y is a vector e.g 
y<-c(7,8,9)

z is a real number e.g.
z<-2.5

If a give the function an input like this, I get 'NA' in return. If I give
the function a vector e.g c(1,2,3) instead of 'x' the function works just
fine. 
Does anyone has an idea why the function would not except 'x' as an input?

Thank you very much!
Stella

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