[Users] init_3_timelevels and nans on past timelevels

Yosef Zlochower yosef at astro.rit.edu
Tue Aug 3 20:41:11 CDT 2021


   I have been running into an issue where I when I interpolate an 
evolved function I get nans even though there are no nans on the 
gridfunction itself. The nans appear to arise when the past timelevels 
(at iteration 0) are initialized by init_3_timelevels and occur near the 
buffer regions. As the evolution proceeds, these bad past timelevels are 
overwritten with seemingly good data. Is this the expected behavior of 

Also, I have been trying to use visit to see what is going on. I used 
CarpetIOHDF5::output_all_timelevels = true, and I think this means that 
the past timelevels show up as different components of the same 
gridfunction although I haven't been able to determine how the component 
number is related to the actual components of the grid and the different 


Dr. Yosef Zlochower
Center for Computational Relativity and Gravitation
Associate Professor
School of Mathematical Sciences
Rochester Institute of Technology
85 Lomb Memorial Drive
Rochester, NY 14623

Phone: +1 585-475-6103

yosef at astro.rit.edu

CONFIDENTIALITY NOTE: The information transmitted, including
attachments, is intended only for the person(s) or entity to which it
is addressed and may contain confidential and/or privileged material.
Any review, retransmission, dissemination or other use of, or taking
of any action in reliance upon this information by persons or entities
other than the intended recipient is prohibited. If you received this
in error, please contact the sender and destroy any copies of this

More information about the Users mailing list