[R] unary operations

[Barry Rowlingson]

Fredrik Lundgren wrote:

> apply(mat, 2, function(e1,e2) e1*e2)

> but I get 
> 
> Error in FUN(newX[, i], ...) : Argument "e2" is missing, with no default
> 
> What do I do wrong?

  Misunderstand what 'apply' does perhaps?

  It applies your function to columns (the '2') of the matrix, and so 
the function should only expect one argument, for example:

 > apply(mat, 2, function(e1){print(e1)})
[1]  5 17
[1]  7 28
[1]  6 36
[1]  7 41
[1]  8 46
[1]  10 140

  - in this toy example,my function is called with e1 set to columns of 
the matrix.

  So what were you trying to do with apply(mat, 2, function(e1,e2) e1*e2)?

Baz