Bayesian Core and loose logs
Jean-Michel (aka Jean-Claude!) Marin came for a few days so that we could make late progress on the revision of our book Bayesian Core towards an Use R! version. In one of the R programs in the mixture chapter, we were getting improbable answers, until we found an R mistake in the shape of
> sum(c(1,2,3,log=TRUE))  7 > sum(c(1,2,3),log=TRUE)  7
which was not detected by the compiler… There are surely plenty of good reasons for this to happen and it did not take long to fix the bug, still… annoying!