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<li>reset_timestep command</li>
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<div class="section" id="reset-timestep-command">
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<span id="index-0"></span><h1>reset_timestep command<a class="headerlink" href="#reset-timestep-command" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>reset_timestep N
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</pre></div>
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</div>
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<ul class="simple">
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<li>N = timestep number</li>
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</ul>
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<div class="section" id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>reset_timestep 0
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reset_timestep 4000000
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Set the timestep counter to the specified value. This command
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normally comes after the timestep has been set by reading a restart
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file via the <a class="reference internal" href="read_restart.html"><em>read_restart</em></a> command, or a previous
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simulation advanced the timestep.</p>
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<p>The <a class="reference internal" href="read_data.html"><em>read_data</em></a> and <a class="reference internal" href="create_box.html"><em>create_box</em></a>
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commands set the timestep to 0; the <a class="reference internal" href="read_restart.html"><em>read_restart</em></a>
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command sets the timestep to the value it had when the restart file
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was written.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
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<blockquote>
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<div>none</div></blockquote>
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<p>This command cannot be used when any fixes are defined that keep track
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of elapsed time to perform certain kinds of time-dependent operations.
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Examples are the <a class="reference internal" href="fix_deposit.html"><em>fix deposit</em></a> and <a class="reference internal" href="fix_dt_reset.html"><em>fix dt/reset</em></a> commands. The former adds atoms on
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specific timesteps. The latter keeps track of accumulated time.</p>
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<p>Various fixes use the current timestep to calculate related
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quantities. If the timestep is reset, this may produce unexpected
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behavior, but LAMMPS allows the fixes to be defined even if the
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timestep is reset. For example, commands which thermostat the system,
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e.g. <a class="reference internal" href="fix_nh.html"><em>fix nvt</em></a>, allow you to specify a target temperature
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which ramps from Tstart to Tstop which may persist over several runs.
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If you change the timestep, you may induce an instantaneous change in
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the target temperature.</p>
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<p>Resetting the timestep clears flags for <a class="reference internal" href="compute.html"><em>computes</em></a> that
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may have calculated some quantity from a previous run. This means
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these quantity cannot be accessed by a variable in between runs until
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a new run is performed. See the <a class="reference internal" href="variable.html"><em>variable</em></a> command for
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more details.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="rerun.html"><em>rerun</em></a></p>
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<p><strong>Default:</strong> none</p>
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