Message-ID: <1320002414631-3953815.post@n4.nabble.com>
Date: 2011-10-30T19:20:14Z
From: David Winsemius
Subject: why the a[-indx] does not work?
In-Reply-To: <4EADA172.6060100@gmail.com>
Duncan Murdoch-2 wrote:
>
> 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
>
>
Or:
a[-c(1,3)]
--
David.
--
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