[R] Combining 2 columns into 1 column many times in a very large dataset

*Combining 2 columns into 1 column many times in a very large dataset* The clumsy solutions I am working on are not going to be very fast if I can get them to work and the true dataset is ~1500 X 45000 so they need to be efficient. I've searched the R help files and the archives for this list and

[R] Simulating Conditional Distributions

ticularly useful when the probability of being "diseased" is even smaller and I want a large number of diseased individuals. Any pointers to do this would be extremely helpful! Thank you, Sherri Rose UC Berkeley [[alternative HTML version deleted]]

[R] Using Predict and GLM

Dear R Help, I read through the archives pretty extensively before sending this email, as it seemed there were several threads on using predict with GLM. However, while my issue is similar to previous posts (cannot get it to predict using new data), none of the suggested fixes are working