Hi, I¹m trying to call some of my c++ code from R and seem to be having an issue with streams, although that¹s just one obvious sign of something different in performance between calling the same function from main in c++ vs. calling the same function from R. I¹m not getting any signs of errors from R, but the behavior is different somehow and in a way that breaks my algorithms. In both cases of launching a function from c++ or R, I redirect cout to a file using a streambuf. In particular, I can see progress stop when launching from R at a point when cout gets truncated when starting to write out iterator values in a std::vector<string>. Then, I find no way to write anything else to cout. When I write those values to Rprintf, they are there and they are as expected. I¹ve tried setting ios_base::sync_with_stdio(false) in case R is messing with stdout and stderr somehow, but that made no difference. I¹m not quite sure how R uses those C FILE* streams. Anyway, I am wondering if anyone has a hunch as to what might be going on. At this point I don¹t know if it might be an issue with R not completely handling c++ from a library or if it is an issue with cout in particular or if there is something else I¹m missing. Please let me know if you have any suggestions for me. Thanks, Sean [[alternative HTML version deleted]]