R help - May 2012 - Equality of multiple vectors

Hello,

I'm writing a piece of code where I need to compare multiple same length
vectors. 

I've gone through the basic functions like identical() or all(), but they
only work for comparing 2 vectors. From 3 vectors on, it doesn't work .

Example: Assuming  
vec1 <- c (1,2,3,4,5)
vec2 <- c(1,2,3,4,5)
vec3 <- c(1,2,3,4,4)

identical (vec1,vec2,vec3) returns TRUE, since the 2 first vectors are
equal. I need a function that returns FALSE if one of the vectors is
different.

Any idea ?

Antoine


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On Fri, May 04, 2012 at 12:53:12AM -0700, aaurouss
wrote:
> Hello,
> 
> I'm writing a piece of code where I need to compare multiple same
length
> vectors. 
> 
> I've gone through the basic functions like identical() or all(), but
they
> only work for comparing 2 vectors. From 3 vectors on, it doesn't work .
> 
> Example: Assuming  
> vec1 <- c (1,2,3,4,5)
> vec2 <- c(1,2,3,4,5)
> vec3 <- c(1,2,3,4,4)
> 
> identical (vec1,vec2,vec3) returns TRUE, since the 2 first vectors are
> equal. I need a function that returns FALSE if one of the vectors is
> different.
Hi.

Try the following.

  length(unique(list(vec1, vec2, vec3))) == 1

  [1] FALSE

  length(unique(list(vec1, vec2, vec1))) == 1

  [1] TRUE

Hope this helps.

Petr Savicky.