Hi Alan, > -----Original Message----- > From: Alan W. Irwin [mailto:[email protected]]
... > > In sum, there is an issue with our Python results on 32-bit Windows that > needs to be > confirmed also on 32-bit Linux. All theoretical analysis and practical gdb > results I can > come up with says this issue cannot occur. So I must be missing something and > need help to figure this out. > Could this be an issue with "extended precision"? It is a bit of a horror that I deemed banished from the earth, but it may be lingering on. The problem with extended precision is that it makes reasoning about programs with floating-point numbers almost impossible. Extended precision uses 80 bits to store intermediate results that may at unpredictable moments in the computations get stored as 32- or 64-bits numbers. While the intermediate results may be more accurate, they cause havoc in the final results. Regards, Arjen DISCLAIMER: This message is intended exclusively for the addressee(s) and may contain confidential and privileged information. If you are not the intended recipient please notify the sender immediately and destroy this message. Unauthorized use, disclosure or copying of this message is strictly prohibited. The foundation 'Stichting Deltares', which has its seat at Delft, The Netherlands, Commercial Registration Number 41146461, is not liable in any way whatsoever for consequences and/or damages resulting from the improper, incomplete and untimely dispatch, receipt and/or content of this e-mail. ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135031&iu=/4140/ostg.clktrk _______________________________________________ Plplot-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/plplot-devel
