combine two columns
Hello,
Following should work.
m <- matrix(round(runif(16,0,2)),nrow=2)
colnames(m) <- c("A","A","B","B","C","C","D","D")
m2 <- m #matrix(, nrow=dim(m)[1], ncol=dim(m)[2]/2)
z <- 1
ss <- seq(1,dim(m)[2],2)
for(j in ss){
for(i in 1:dim(m)[1]){
m2[i,j] <- substring(m[i,ss[z]] == m[i,ss[z]+1],1,1)
}
z <- z + 1
}
m2 <- m2[,ss]
colnames(m2) <- colnames(m)[ss]
When your data set is large, then you should try to code this using
apply.
Best,
Matthias
Hi,
I have an R programming problem and I havent found anything
in the documentation yet:
I have a data matrix, in which two neighbouring columns
represent replicates of the same experiment, e.g. something like this:
A A B B C C
row1 1 1 1 2 2 2
row2 1 1 1 1 1 2
I would like to test, if the values for the two replicates in
a row are the same or if they differ and generate a new
matrix with the results of the tests, something like this:
A B C
row1 T F T
row2 T T F
Any hint will be appreciated!
Georg
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