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<section id="b4step-default-routines">
<span id="b4step-defaults"></span><h1>b4step default routines<a class="headerlink" href="#b4step-default-routines" title="Permalink to this heading">¶</a></h1>
<p>Below are linkes to the default <cite>b4step</cite> library routines for Classic and AMRClaw.
By default these do nothing. If you wish to specify <cite>aux</cite> arrays you will
need to copy one of these files to your application directory and modify it
as needed. Remember to change to <cite>Makefile</cite> to point to the proper version.</p>
<ul class="simple">
<li><p><a class="reference external" href="https://github.com/clawpack/classic/blob/master/src/1d/b4step1.f90">$CLAW/classic/src/1d/b4step1.f90</a></p></li>
<li><p><a class="reference external" href="https://github.com/clawpack/classic/blob/master/src/2d/b4step2.f90">$CLAW/classic/src/2d/b4step2.f90</a></p></li>
<li><p><a class="reference external" href="https://github.com/clawpack/classic/blob/master/src/3d/b4step3.f90">$CLAW/classic/src/3d/b4step3.f90</a></p></li>
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<p>(Note: these links are for the version checked in to the master branch.
You can select a different branch or tag from the GitHub page.)</p>
<section id="b4step-routine-in-geoclaw">
<span id="b4step-geoclaw"></span><h2>b4step routine in GeoClaw<a class="headerlink" href="#b4step-routine-in-geoclaw" title="Permalink to this heading">¶</a></h2>
<p>In GeoClaw, there is a library routine that sets <cite>aux(1,i,j)</cite> to the cell
average of the bathymetry, <cite>aux(2,i,j)</cite> to the ratio of the true cell area
to <cite>dx*dy</cite> (the capacity function), and <cite>aux(3,i,j)</cite> to the length ratio of
the bottom edge to <cite>dx</cite> (The latter two quantities vary
with latitude when <cite>coordinate_system == 2</cite>).</p>
<ul class="simple">
<li><p><a class="reference external" href="https://github.com/clawpack/geoclaw/blob/master/src/2d/shallow/b4step2.f90">$CLAW/geoclaw/src/2d/shallow/b4step2.f90</a></p></li>
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<li><a class="reference internal" href="#">b4step default routines</a><ul>
<li><a class="reference internal" href="#b4step-routine-in-geoclaw">b4step routine in GeoClaw</a></li>
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