[R] why the a[-indx] does not work?

[Duncan Murdoch]

On 11-10-30 2:52 PM, Alaios wrote:
> Dear all,
>
> Could you please explain me why
>
>> OverloadsTesT
> [1] 1 0 1 0 0 0 0 0 0 0
>> a<-matrix(data=seq(1,10),nrow=10)
>> a
> [,1]
> [1,]    1
> [2,]    2
> [3,]    3
> [4,]    4
> [5,]    5
> [6,]    6
> [7,]    7
> [8,]    8
> [9,]    9
> [10,]   10
>> a[-OverloadsTesT]
> [1]  2  3  4  5  6  7  8  9 10
>
>
>
> the last line does not remove the first and third element and only does the first element.?
>
> What I want to do is for zeros to return the elements and for any positive value to remove it.
> What I am doing wrong?

You are asking it to remove item 1, and it does.  If you want to negate 
a logical vector, you need to use a logical vector and negate it, e.g.

OverloadsTesT <- as.logical(OverloadsTeSt)
a[!OverloadsTest]

Duncan Murdoch