Message-ID: <4EADA172.6060100@gmail.com>
Date: 2011-10-30T19:11:46Z
From: Duncan Murdoch
Subject: why the a[-indx] does not work?
In-Reply-To: <1320000722.64455.YahooMailNeo@web120111.mail.ne1.yahoo.com>
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