Re: [Mplapack-devel] Can I compute eigenvalues of ill-conditioned matrix less than 10^-156 ?
Status: Pre-Alpha
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nakatamaho
From: Gang Y. <ee...@gm...> - 2011-09-13 03:45:55
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Hi, Maho, Gang, if you want to use MPACK, as Kouya-sensei wrote, please use > GMP or MPFR version (to enlarge your precision). > I published a tutorial in Japanese (sorry), and > I'll upload to the web page when I can publish my original one at the web. > In the mean time, if you can use GMP version and setting > MPACK_GMP_PRECISION environment variable to change pricision dynamically. > Yes, I used the GMP and MPFR version and tuned the precision variable from 256 to 2048, but the results are truncated at ~10^-156. When the eigenvalues are smaller than ~10^-156, they will become negative. How can I improve the precision beyond 10^-156? Thanks. > > Thanks > Nakata Maho > best, gang |