General suggestions for debugging in R

Question

I get an error when using an R function that I wrote:

Warning messages:
1: glm.fit: algorithm did not converge 
2: glm.fit: algorithm did not converge 
         


        

Answer 1

After going through all the steps suggested here I just learned that setting .verbose = TRUE in foreach() also gives me tons of useful information. In particular foreach(.verbose=TRUE) shows exactly where an error occurs inside the foreach loop, while traceback() does not look inside the foreach loop.