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...omeone > else will be able to repeat and possibly adjust. > Tomas Yes, indeed! I strongly agree with Thomas: This is about serious quality assurance of an important part of R, and replacing all identical() checks there with all.equal() -- which has a default tolerance of allowing __HALF__ of the precision being lost !! -- in the way you, Simon, proposed, is definitely basically destroying the QC/QA we have in place there. As Tomas said, *some* of the checks possibly should be done all.equal, but with a very a small tolerance; however other checks should not allow a tolerance,...

Hi Tomas, Thanks for your reply. I find your response curious, however. Surely the identical() test is simply incorrect when catering for possibly different BLAS implementations? Or is it the case that conformant BLAS implementations all produce bit-identical results, which seems unlikely? (Sorry, I am unfamiliar with the BLAS spec.) Although whatever the answer to this theoretical question,