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<title>angle_style command — LAMMPS 15 May 2015 version documentation</title>
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<div class="section" id="angle-style-command">
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<span id="index-0"></span><h1>angle_style command<a class="headerlink" href="#angle-style-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>angle_style style
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</pre></div>
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</div>
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<ul class="simple">
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<li>style = <em>none</em> or <em>hybrid</em> or <em>charmm</em> or <em>class2</em> or <em>cosine</em> or <em>cosine/squared</em> or <em>harmonic</em></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>angle_style harmonic
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angle_style charmm
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angle_style hybrid harmonic cosine
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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 formula(s) LAMMPS uses to compute angle interactions between
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triplets of atoms, which remain in force for the duration of the
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simulation. The list of angle triplets is read in by a
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<a class="reference internal" href="read_data.html"><em>read_data</em></a> or <a class="reference internal" href="read_restart.html"><em>read_restart</em></a> command
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from a data or restart file.</p>
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<p>Hybrid models where angles are computed using different angle
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potentials can be setup using the <em>hybrid</em> angle style.</p>
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<p>The coefficients associated with a angle style can be specified in a
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data or restart file or via the <a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a> command.</p>
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<p>All angle potentials store their coefficient data in binary restart
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files which means angle_style and <a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a>
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commands do not need to be re-specified in an input script that
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restarts a simulation. See the <a class="reference internal" href="read_restart.html"><em>read_restart</em></a>
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command for details on how to do this. The one exception is that
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angle_style <em>hybrid</em> only stores the list of sub-styles in the restart
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file; angle coefficients need to be re-specified.</p>
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<div class="admonition warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">When both an angle and pair style is defined, the
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<a class="reference internal" href="special_bonds.html"><em>special_bonds</em></a> command often needs to be used to
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turn off (or weight) the pairwise interaction that would otherwise
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exist between 3 bonded atoms.</p>
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</div>
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<p>In the formulas listed for each angle style, <em>theta</em> is the angle
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between the 3 atoms in the angle.</p>
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<hr class="docutils" />
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<p>Here is an alphabetic list of angle styles defined in LAMMPS. Click on
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the style to display the formula it computes and coefficients
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specified by the associated <a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a> command.</p>
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<p>Note that there are also additional angle styles submitted by users
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which are included in the LAMMPS distribution. The list of these with
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links to the individual styles are given in the angle section of <a class="reference internal" href="Section_commands.html#cmd-5"><span>this page</span></a>.</p>
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<ul class="simple">
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<li><a class="reference internal" href="angle_none.html"><em>angle_style none</em></a> - turn off angle interactions</li>
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<li><a class="reference internal" href="angle_hybrid.html"><em>angle_style hybrid</em></a> - define multiple styles of angle interactions</li>
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<li><a class="reference internal" href="angle_charmm.html"><em>angle_style charmm</em></a> - CHARMM angle</li>
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<li><a class="reference internal" href="angle_class2.html"><em>angle_style class2</em></a> - COMPASS (class 2) angle</li>
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<li><a class="reference internal" href="angle_cosine.html"><em>angle_style cosine</em></a> - cosine angle potential</li>
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<li><a class="reference internal" href="angle_cosine_delta.html"><em>angle_style cosine/delta</em></a> - difference of cosines angle potential</li>
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<li><a class="reference internal" href="angle_cosine_periodic.html"><em>angle_style cosine/periodic</em></a> - DREIDING angle</li>
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<li><a class="reference internal" href="angle_cosine_squared.html"><em>angle_style cosine/squared</em></a> - cosine squared angle potential</li>
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<li><a class="reference internal" href="angle_harmonic.html"><em>angle_style harmonic</em></a> - harmonic angle</li>
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<li><a class="reference internal" href="angle_table.html"><em>angle_style table</em></a> - tabulated by angle</li>
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</ul>
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</div>
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<hr class="docutils" />
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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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<p>Angle styles can only be set for atom_styles that allow angles to be
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defined.</p>
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<p>Most angle styles are part of the MOLECULE package. They are only
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enabled if LAMMPS was built with that package. See the <a class="reference internal" href="Section_start.html#start-3"><span>Making LAMMPS</span></a> section for more info on packages.
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The doc pages for individual bond potentials tell if it is part of a
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package.</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="angle_coeff.html"><em>angle_coeff</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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<div class="highlight-python"><div class="highlight"><pre>angle_style none
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</pre></div>
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