Creating string vector from loop

Question

I am trying to create a label to the combn command so that I know exactly which pairs where compared. Here's an example: Let a be my vector of interest,

a<-seq(1,10,1)
c<-combn(a,2)

So I want to create a vector label with the numbers that are paired:

label<-rep("abc",times=ncol(c)) #This is just a vector to initialized "label"
head(label)

for(i in ncol(c)){
label[i]<-c(paste("Exon",c[1,i],"with",c[2,i]))
}
head(label)

The problem is when I run the for loop it doesn't work. Alternatively, it only outputs the last comparison.

Your loop runs only once because ncol(c) is only a single value. You have to use something like 1:ncol(c) or seq(along=label). — sgibb
– sgibb, Commented Apr 20, 2013 at 21:18

sgibb · Accepted Answer · 2013-04-20 21:17:11Z

3

Remove the loop and use a vectorized approach:

label <- paste("Exon", c[1,] "with", c[2,])

BTW: c is a very bad variable name (see ?c).

answered Apr 20, 2013 at 21:17

sgibb

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1 Comment

agstudy Over a year ago

@sgibb why is very bad to use c as a name? you should (some situations) use base::c , that's about it. maybe not elegant but I don't think it is so bad.

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