R loop missing value where TRUE/FALSE needed

Question

I've got this code in R:

j <- 1
k <- nrow(group_IDs)

  while (j <= k)
        {   
            d_clust <- Mclust(Customers_Attibutes_s[which    (Customers_Attibutes_s$Group_ID == group_IDs$Group_ID[j]),3:7], G=2:7)
            temp <- cbind(Customers_Attibutes[which        (Customers_Attibutes$Group_ID == group_IDs$Group_ID[j]),], as.data.frame    (predict.Mclust(d_clust, Customers_Attibutes[which(Customers_Attibutes$Group_ID     == group_IDs$Group_ID[j]), 3:7]))[1])
            temp_ <- rbind(temp,temp_)
            j <- j+1
        }

j <= k in the while statement is returning this error:

missing value where TRUE/FALSE needed.

group_IDs is not null and it actually contains the value 8 in this case. It seems to get into the loop and crash at the second round.

nrow(group_IDs) is a vector that in this case contains just one value. The value is number 8 but it could be any series of numbers. — Dario Federici

Thomas Kiehne Thomas Kiehne · Accepted Answer · 2016-07-05T04:17:15

You can get around the indexing issues using for, e.g.:

for (ID in group_IDs) {}

This, of course, assumes that group_IDs is a vector of values.

Note: Your code shows the following inside the loop group_IDs$Group_ID[j] which implies something other than a vector; perhaps you meant group_IDs[j]?

R loop missing value where TRUE/FALSE needed

2 Answers