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dense eigensolvers?

Posted: Tue Jul 02, 2019 10:40 pm
by huuanh2811
I found an SC15 poster that said all four dense symmetric tridiagonal eigensolvers (QR, divide and conquer, bisection and inverse iteration, and MRRR) were included in MAGMA. When I downloaded 2.0, however, I only saw the D&C driver. What is the actual status of the others?

Re: dense eigensolvers?

Posted: Wed Jul 03, 2019 12:30 am
by mgates3
For complex matrices:
magma_[cz]heevd* uses divide-and-conquer
magma_[cz]heevr* uses MRRR
magma_[cz]heevx* uses QR iteration if MagmaRangeAll, or bisection if MagmaRangeV or MagmaRangeI.

For real matrices, only divide-and-conquer is available:

BTW, MAGMA is at version 2.5, not 2.0.