R help - Sep 2005 - how to do sthg like "mat[!=(ind),]"

Hi 

I want to do something which seems straightforward, but I couldn't find the 
way to do this. 
I have a matrix called m for example, and a vector of values (let's call ind
this vector) which are indices of lines I don't want to keep. 

for example I have:
> m
v1 v2 v3
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
[4,] 10 11 12
> ind
[1] 2 4


I would like to obtain this:
> m2
v1 v2 v3
[1,] 1 4 7
[3,] 3 6 9

by saying something like 

m2<-m[!=(ind),] 

but this line does not work. 

Any idea or suggestion highly welcome !

Florence.

	[[alternative HTML version deleted]]

Florence Combes wrote:
> Hi 
> 
> I want to do something which seems straightforward, but I couldn't find
the
> way to do this. 
> I have a matrix called m for example, and a vector of values (let's
call ind
> this vector) which are indices of lines I don't want to keep. 
> 
> for example I have:
> 
> 
>>m
> 
> v1 v2 v3
> [1,] 1 4 7
> [2,] 2 5 8
> [3,] 3 6 9
> [4,] 10 11 12
> 
> 
>>ind
> 
> [1] 2 4
> 
> 
> I would like to obtain this:
> 
> 
>>m2
> 
> v1 v2 v3
> [1,] 1 4 7
> [3,] 3 6 9
> 
> by saying something like 
> 
> m2<-m[!=(ind),] 


See help("[") and learn about negative indices:

m2 <- m[-ind,]

Uwe Ligges

> but this line does not work. 
> 
> Any idea or suggestion highly welcome !
> 
> Florence.
> 
> 	[[alternative HTML version deleted]]
> 
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