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

Mark Bravington's debugger which is available as the package debug on CRAN is very good and pretty straight forward.

library(debug);
mtrace(myfunction);
myfunction(a,b);
#... debugging, can query objects, step, skip, run, breakpoints etc..
qqq(); # quit the debugger only
mtrace.off(); # turn off debugging

The code pops up in a highlighted Tk window so you can see what's going on and, of course you can call another mtrace() while in a different function.

HTH