<html>#2554: init_3_timelevels produces nans on past timelevels of the initial slice
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<tr><td style='text-align:right'> Reporter:</td><td>Yosef Zlochower</td></tr>
<tr><td style='text-align:right'> Status:</td><td>new</td></tr>
<tr><td style='text-align:right'>Milestone:</td><td></td></tr>
<tr><td style='text-align:right'> Version:</td><td>ET_2021_05</td></tr>
<tr><td style='text-align:right'> Type:</td><td>bug</td></tr>
<tr><td style='text-align:right'> Priority:</td><td>minor</td></tr>
<tr><td style='text-align:right'>Component:</td><td>Carpet</td></tr>
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<p>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. </p>
<p>The attached thorn demonstrates the issue by evolving the trivial system</p>
<p>dt_f = 1</p>
<p>In visit you can see nans on the “_p_p” timelevel at iteration 1 (not iteration 0??). The nans go away later in the evolution.</p>
<p><table><tr><td>attachment:</td><td><a href="https://api.bitbucket.org/2.0/repositories/einsteintoolkit/tickets/issues/2554/attachments/init3.par">init3.par</a></td></tr>
<tr><td>attachment:</td><td><a href="https://api.bitbucket.org/2.0/repositories/einsteintoolkit/tickets/issues/2554/attachments/TestInit3.tar.gz">TestInit3.tar.gz</a></td></tr>
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<p>--<br/>
Ticket URL: <a href='https://bitbucket.org/einsteintoolkit/tickets/issues/2554/init_3_timelevels-produces-nans-on-past'>https://bitbucket.org/einsteintoolkit/tickets/issues/2554/init_3_timelevels-produces-nans-on-past</a></p>
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