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<HTML>
<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
</CENTER>
<HR>
<H3>angle_style cosine/delta command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>angle_style cosine/delta
</PRE>
<P><B>Examples:</B>
</P>
<PRE>angle_style cosine/delta
angle_coeff 2*4 75.0 100.0
</PRE>
<P><B>Description:</B>
</P>
<P>The <I>cosine/delta</I> angle style uses the potential
</P>
<CENTER><IMG SRC = "Eqs/angle_cosine_delta.jpg">
</CENTER>
<P>where theta0 is the equilibrium value of the angle, and K is a
prefactor. Note that the usual 1/2 factor is included in K.
</P>
<P>The following coefficients must be defined for each angle type via the
<A HREF = "angle_coeff.html">angle_coeff</A> command as in the example above, or in
the data file or restart files read by the <A HREF = "read_data.html">read_data</A>
or <A HREF = "read_restart.html">read_restart</A> commands:
</P>
<UL><LI>K (energy)
<LI>theta0 (degrees)
</UL>
<P>Theta0 is specified in degrees, but LAMMPS converts it to radians
internally.
</P>
<P><B>Restrictions:</B>
</P>
<P>This angle style can only be used if LAMMPS was built with the
"molecular" package (which it is by default). See the <A HREF = "Section_start.html#2_3">Making
LAMMPS</A> section for more info on packages.
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "angle_coeff.html">angle_coeff</A>, <A HREF = "angle_cosine_squared.html">angle_style
cosine/squared</A>
</P>
<P><B>Default:</B> none
</P>
</HTML>

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"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
:link(lws,http://lammps.sandia.gov)
:link(ld,Manual.html)
:link(lc,Section_commands.html#comm)
:line
angle_style cosine/delta command :h3
[Syntax:]
angle_style cosine/delta :pre
[Examples:]
angle_style cosine/delta
angle_coeff 2*4 75.0 100.0 :pre
[Description:]
The {cosine/delta} angle style uses the potential
:c,image(Eqs/angle_cosine_delta.jpg)
where theta0 is the equilibrium value of the angle, and K is a
prefactor. Note that the usual 1/2 factor is included in K.
The following coefficients must be defined for each angle type via the
"angle_coeff"_angle_coeff.html command as in the example above, or in
the data file or restart files read by the "read_data"_read_data.html
or "read_restart"_read_restart.html commands:
K (energy)
theta0 (degrees) :ul
Theta0 is specified in degrees, but LAMMPS converts it to radians
internally.
[Restrictions:]
This angle style can only be used if LAMMPS was built with the
"molecular" package (which it is by default). See the "Making
LAMMPS"_Section_start.html#2_3 section for more info on packages.
[Related commands:]
"angle_coeff"_angle_coeff.html, "angle_style
cosine/squared"_angle_cosine_squared.html
[Default:] none