Avoid the use of for loops

Question

I\'m working with R and I have a code like this:

for (i in 1:10)
   for (j in 1:100)
        if (data[i] == paths[j,1])
            cluster[i,4] <         


        

Answer 1

I think that both loops can be vectorized using the following:

cluster[na.omit(match(paths[1:100,1],data[1:10])),4] = paths[!is.na(match(paths[1:100,1],data[1:10])),2]