Strength matrix

[rfalgout]

This branch implements a new strength measure idea.

[rfalgout]

Hi @oseikuffuor1 and @waynemitchell . This branch is now up to date with master. I removed the cogent proxy from the Makefile (it doesn't build currently, and we probably don't want it in hypre anyway) and I added a one line description of the strength option to ij.c (it will need to be updated at some point).

The code doesn't work correctly for the matrices I am testing, but I'm pretty sure it's because the matrices are negative definite and the current code looks for positive off-diagonal entries instead of same-sign-as-diagonal. I'll try to fix that.

[oseikuffuor1]

Thanks Rob!

…

-Daniel Daniel Osei-Kuffuor Center for Applied Scientific Computing Lawrence Livermore National Laboratory Livermore, CA 94550 Mail Code: L-561 Phone: 925-422-7683 Email: ***@***.******@***.***>

________________________________ From: Rob Falgout ***@***.***> Sent: Monday, February 10, 2025 1:48 PM To: hypre-space/hypre ***@***.***> Cc: Osei-Kuffuor, Daniel ***@***.***>; Mention ***@***.***> Subject: Re: [hypre-space/hypre] Strength matrix (PR #1234) Hi @oseikuffuor1<https://urldefense.us/v3/__https://github.com/oseikuffuor1__;!!G2kpM7uM-TzIFchu!xSkLDougQ-EqEZF3Jor9tfaYqzr3qs3KPXN-Qz9s30ihjC1TwxfGOiobKyhSuO7CYrjmN_9GjbP4obmMWSK1brpShnyUoQ$> and @waynemitchell<https://urldefense.us/v3/__https://github.com/waynemitchell__;!!G2kpM7uM-TzIFchu!xSkLDougQ-EqEZF3Jor9tfaYqzr3qs3KPXN-Qz9s30ihjC1TwxfGOiobKyhSuO7CYrjmN_9GjbP4obmMWSK1brqO9iejBQ$> . This branch is now up to date with master. I removed the cogent proxy from the Makefile (it doesn't build currently, and we probably don't want it in hypre anyway) and I added a one line description of the strength option to ij.c (it will need to be updated at some point). The code doesn't work correctly for the matrices I am testing, but I'm pretty sure it's because the matrices are negative definite and the current code looks for positive off-diagonal entries instead of same-sign-as-diagonal. I'll try to fix that. — Reply to this email directly, view it on GitHub<https://urldefense.us/v3/__https://github.com/hypre-space/hypre/pull/1234*issuecomment-2649316543__;Iw!!G2kpM7uM-TzIFchu!xSkLDougQ-EqEZF3Jor9tfaYqzr3qs3KPXN-Qz9s30ihjC1TwxfGOiobKyhSuO7CYrjmN_9GjbP4obmMWSK1broWWDIAgQ$>, or unsubscribe<https://urldefense.us/v3/__https://github.com/notifications/unsubscribe-auth/AFMCRS7JXICSP2YFMGXEP3D2PENBXAVCNFSM6AAAAABW3PH236VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNBZGMYTMNJUGM__;!!G2kpM7uM-TzIFchu!xSkLDougQ-EqEZF3Jor9tfaYqzr3qs3KPXN-Qz9s30ihjC1TwxfGOiobKyhSuO7CYrjmN_9GjbP4obmMWSK1brrdE_EQWQ$>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[rfalgout]

Okay, this seems to fix the negative diagonal case. The strength measure doesn't really help with the matrices I am testing though. :( This deserves a much closer investigation, of course.