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<div class="section" id="fix-print-command">
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<span id="index-0"></span><h1>fix print command<a class="headerlink" href="#fix-print-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>fix ID group-ID print N string keyword value ...
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</pre></div>
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</div>
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<ul class="simple">
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<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><em>fix</em></a> command</li>
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<li>print = style name of this fix command</li>
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<li>N = print every N steps</li>
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<li>string = text string to print with optional variable names</li>
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<li>zero or more keyword/value pairs may be appended</li>
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<li>keyword = <em>file</em> or <em>append</em> or <em>screen</em> or <em>title</em></li>
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</ul>
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<pre class="literal-block">
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<em>file</em> value = filename
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<em>append</em> value = filename
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<em>screen</em> value = <em>yes</em> or <em>no</em>
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<em>title</em> value = string
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string = text to print as 1st line of output file
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</pre>
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</div>
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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>fix extra all print 100 "Coords of marker atom = $x $y $z"
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fix extra all print 100 "Coords of marker atom = $x $y $z" file coord.txt
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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>Print a text string every N steps during a simulation run. This can
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be used for diagnostic purposes or as a debugging tool to monitor some
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quantity during a run. The text string must be a single argument, so
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it should be enclosed in double quotes if it is more than one word.
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If it contains variables it must be enclosed in double quotes to
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insure they are not evaluated when the input script line is read, but
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will instead be evaluated each time the string is printed.</p>
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<p>The specified group-ID is ignored by this fix.</p>
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<p>See the <a class="reference internal" href="variable.html"><em>variable</em></a> command for a description of <em>equal</em>
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style variables which are the most useful ones to use with the fix
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print command, since they are evaluated afresh each timestep that the
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fix print line is output. Equal-style variables calculate formulas
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involving mathematical operations, atom properties, group properties,
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thermodynamic properties, global values calculated by a
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<a class="reference internal" href="compute.html"><em>compute</em></a> or <a class="reference internal" href="fix.html"><em>fix</em></a>, or references to other
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<a class="reference internal" href="variable.html"><em>variables</em></a>.</p>
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<p>If the <em>file</em> or <em>append</em> keyword is used, a filename is specified to
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which the output generated by this fix will be written. If <em>file</em> is
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used, then the filename is overwritten if it already exists. If
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<em>append</em> is used, then the filename is appended to if it already
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exists, or created if it does not exist.</p>
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<p>If the <em>screen</em> keyword is used, output by this fix to the screen and
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logfile can be turned on or off as desired.</p>
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<p>The <em>title</em> keyword allow specification of the string that will be
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printed as the first line of the output file, assuming the <em>file</em>
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keyword was used. By default, the title line is as follows:</p>
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<div class="highlight-python"><div class="highlight"><pre><span class="c"># Fix print output for fix ID</span>
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</pre></div>
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</div>
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<p>where ID is replaced with the fix-ID.</p>
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</div>
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<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
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<h2>Restart, fix_modify, output, run start/stop, minimize info<a class="headerlink" href="#restart-fix-modify-output-run-start-stop-minimize-info" title="Permalink to this headline">¶</a></h2>
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<p>No information about this fix is written to <a class="reference internal" href="restart.html"><em>binary restart files</em></a>. None of the <a class="reference internal" href="fix_modify.html"><em>fix_modify</em></a> options
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are relevant to this fix. No global or per-atom quantities are stored
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by this fix for access by various <a class="reference internal" href="Section_howto.html#howto-15"><span>output commands</span></a>. No parameter of this fix can
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be used with the <em>start/stop</em> keywords of the <a class="reference internal" href="run.html"><em>run</em></a> command.
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This fix is not invoked during <a class="reference internal" href="minimize.html"><em>energy minimization</em></a>.</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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</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="variable.html"><em>variable</em></a>, <a class="reference internal" href="print.html"><em>print</em></a></p>
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</div>
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<div class="section" id="default">
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<h2>Default<a class="headerlink" href="#default" title="Permalink to this headline">¶</a></h2>
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<p>The option defaults are no file output, screen = yes, and title string
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as described above.</p>
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