Hi R users,

I have a question. How can I use for loop to do pair comparisons. For
example,

> x<-c(1,2,3)

> result<-matrix(data=NA, nrow=choose(3,2), ncol=1)

> for(i in 1: length(x))

+    { result[i,]<-ifelse(x[i] > x[i+1], yes="Big", no="Small")

+     result}

> result

     [,1]   

[1,] "Small"

[2,] "Small"

[3,] NA     

 

I want to compare (1 vs. 2), (1 vs. 3), (2 vs.3) 

I know I miss something but I just can not get it work. Could anyone give me
a hint?

 

Appreciate,

Chunhao 


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