git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@3582 f3b2605a-c512-4ea7-a41b-209d697bcdaa

doc/Section_commands.html

@@ -347,11 +347,11 @@ each style or click on the style itself for a full description:
 </P>
 <DIV ALIGN=center><TABLE  BORDER=1 >
 <TR ALIGN="center"><TD ><A HREF = "compute_angle_local.html">angle/local</A></TD><TD ><A HREF = "compute_bond_local.html">bond/local</A></TD><TD ><A HREF = "compute_cna_atom.html">cna/atom</A></TD><TD ><A HREF = "compute_com.html">com</A></TD><TD ><A HREF = "compute_coord_atom.html">coord/atom</A></TD><TD ><A HREF = "compute_damage_atom.html">damage/atom</A></TD></TR>
-<TR ALIGN="center"><TD ><A HREF = "compute_displace_atom.html">displace/atom</A></TD><TD ><A HREF = "compute_erotate_asphere.html">erotate/asphere</A></TD><TD ><A HREF = "compute_erotate_sphere.html">erotate/sphere</A></TD><TD ><A HREF = "compute_event_displace.html">event/displace</A></TD><TD ><A HREF = "compute_group_group.html">group/group</A></TD><TD ><A HREF = "compute_gyration.html">gyration</A></TD></TR>
+<TR ALIGN="center"><TD ><A HREF = "compute_dihedral_local.html">dihedral/local</A></TD><TD ><A HREF = "compute_displace_atom.html">displace/atom</A></TD><TD ><A HREF = "compute_erotate_asphere.html">erotate/asphere</A></TD><TD ><A HREF = "compute_erotate_sphere.html">erotate/sphere</A></TD><TD ><A HREF = "compute_event_displace.html">event/displace</A></TD><TD ><A HREF = "compute_group_group.html">group/group</A></TD></TR>
-<TR ALIGN="center"><TD ><A HREF = "compute_heat_flux.html">heat/flux</A></TD><TD ><A HREF = "compute_ke.html">ke</A></TD><TD ><A HREF = "compute_ke_atom.html">ke/atom</A></TD><TD ><A HREF = "compute_msd.html">msd</A></TD><TD ><A HREF = "compute_pe.html">pe</A></TD><TD ><A HREF = "compute_pe_atom.html">pe/atom</A></TD></TR>
+<TR ALIGN="center"><TD ><A HREF = "compute_gyration.html">gyration</A></TD><TD ><A HREF = "compute_heat_flux.html">heat/flux</A></TD><TD ><A HREF = "compute_improper_local.html">improper/local</A></TD><TD ><A HREF = "compute_ke.html">ke</A></TD><TD ><A HREF = "compute_ke_atom.html">ke/atom</A></TD><TD ><A HREF = "compute_msd.html">msd</A></TD></TR>
-<TR ALIGN="center"><TD ><A HREF = "compute_pressure.html">pressure</A></TD><TD ><A HREF = "compute_property_atom.html">property/atom</A></TD><TD ><A HREF = "compute_property_local.html">property/local</A></TD><TD ><A HREF = "compute_rdf.html">rdf</A></TD><TD ><A HREF = "compute_reduce.html">reduce</A></TD><TD ><A HREF = "compute_reduce.html">reduce/region</A></TD></TR>
+<TR ALIGN="center"><TD ><A HREF = "compute_pe.html">pe</A></TD><TD ><A HREF = "compute_pe_atom.html">pe/atom</A></TD><TD ><A HREF = "compute_pressure.html">pressure</A></TD><TD ><A HREF = "compute_property_atom.html">property/atom</A></TD><TD ><A HREF = "compute_property_local.html">property/local</A></TD><TD ><A HREF = "compute_rdf.html">rdf</A></TD></TR>
-<TR ALIGN="center"><TD ><A HREF = "compute_stress_atom.html">stress/atom</A></TD><TD ><A HREF = "compute_temp.html">temp</A></TD><TD ><A HREF = "compute_temp_asphere.html">temp/asphere</A></TD><TD ><A HREF = "compute_temp_com.html">temp/com</A></TD><TD ><A HREF = "compute_temp_deform.html">temp/deform</A></TD><TD ><A HREF = "compute_temp_partial.html">temp/partial</A></TD></TR>
+<TR ALIGN="center"><TD ><A HREF = "compute_reduce.html">reduce</A></TD><TD ><A HREF = "compute_reduce.html">reduce/region</A></TD><TD ><A HREF = "compute_stress_atom.html">stress/atom</A></TD><TD ><A HREF = "compute_temp.html">temp</A></TD><TD ><A HREF = "compute_temp_asphere.html">temp/asphere</A></TD><TD ><A HREF = "compute_temp_com.html">temp/com</A></TD></TR>
-<TR ALIGN="center"><TD ><A HREF = "compute_temp_profile.html">temp/profile</A></TD><TD ><A HREF = "compute_temp_ramp.html">temp/ramp</A></TD><TD ><A HREF = "compute_temp_region.html">temp/region</A></TD><TD ><A HREF = "compute_temp_sphere.html">temp/sphere</A> 
+<TR ALIGN="center"><TD ><A HREF = "compute_temp_deform.html">temp/deform</A></TD><TD ><A HREF = "compute_temp_partial.html">temp/partial</A></TD><TD ><A HREF = "compute_temp_profile.html">temp/profile</A></TD><TD ><A HREF = "compute_temp_ramp.html">temp/ramp</A></TD><TD ><A HREF = "compute_temp_region.html">temp/region</A></TD><TD ><A HREF = "compute_temp_sphere.html">temp/sphere</A> 
 </TD></TR></TABLE></DIV>
 
 <P>These are compute styles contributed by users, which can be used if

doc/Section_commands.txt

@@ -465,6 +465,7 @@ each style or click on the style itself for a full description:
 "com"_compute_com.html,
 "coord/atom"_compute_coord_atom.html,
 "damage/atom"_compute_damage_atom.html,
+"dihedral/local"_compute_dihedral_local.html,
 "displace/atom"_compute_displace_atom.html,
 "erotate/asphere"_compute_erotate_asphere.html,
 "erotate/sphere"_compute_erotate_sphere.html,
@@ -472,6 +473,7 @@ each style or click on the style itself for a full description:
 "group/group"_compute_group_group.html,
 "gyration"_compute_gyration.html,
 "heat/flux"_compute_heat_flux.html,
+"improper/local"_compute_improper_local.html,
 "ke"_compute_ke.html,
 "ke/atom"_compute_ke_atom.html,
 "msd"_compute_msd.html,

doc/compute.html

@@ -173,6 +173,7 @@ available in LAMMPS:
 <LI><A HREF = "compute_com.html">com</A> - center-of-mass of group of atoms
 <LI><A HREF = "compute_coord_atom.html">coord/atom</A> - coordination number for each atom
 <LI><A HREF = "compute_damage_atom.html">damage/atom</A> - Peridynamic damage for each atom
+<LI><A HREF = "compute_dihedral_local.html">dihedral/local</A> - angle of each dihedral
 <LI><A HREF = "compute_displace_atom.html">displace/atom</A> - displacement of each atom
 <LI><A HREF = "compute_erotate_asphere.html">erotate/asphere</A> - rotational energy of aspherical particles
 <LI><A HREF = "compute_erotate_sphere.html">erotate/sphere</A> - rotational energy of spherical particles
@@ -180,6 +181,7 @@ available in LAMMPS:
 <LI><A HREF = "compute_group_group.html">group/group</A> - energy/force between two groups of atoms
 <LI><A HREF = "compute_gyration.html">gyration</A> - radius of gyration of group of atoms
 <LI><A HREF = "compute_heat_flux.html">heat/flux</A> - heat flux through a group of atoms
+<LI><A HREF = "compute_improper_local.html">improper/local</A> - angle of each improper
 <LI><A HREF = "compute_ke.html">ke</A> - translational kinetic energy
 <LI><A HREF = "compute_ke_atom.html">ke/atom</A> - kinetic energy for each atom
 <LI><A HREF = "compute_msd.html">msd</A> - mean-squared displacement of group of atoms

doc/compute.txt

@@ -168,6 +168,7 @@ available in LAMMPS:
 "com"_compute_com.html - center-of-mass of group of atoms
 "coord/atom"_compute_coord_atom.html - coordination number for each atom
 "damage/atom"_compute_damage_atom.html - Peridynamic damage for each atom
+"dihedral/local"_compute_dihedral_local.html - angle of each dihedral
 "displace/atom"_compute_displace_atom.html - displacement of each atom
 "erotate/asphere"_compute_erotate_asphere.html - rotational energy of aspherical particles
 "erotate/sphere"_compute_erotate_sphere.html - rotational energy of spherical particles
@@ -175,6 +176,7 @@ available in LAMMPS:
 "group/group"_compute_group_group.html - energy/force between two groups of atoms
 "gyration"_compute_gyration.html - radius of gyration of group of atoms
 "heat/flux"_compute_heat_flux.html - heat flux through a group of atoms
+"improper/local"_compute_improper_local.html - angle of each improper
 "ke"_compute_ke.html - translational kinetic energy
 "ke/atom"_compute_ke_atom.html - kinetic energy for each atom
 "msd"_compute_msd.html - mean-squared displacement of group of atoms

doc/compute_angle_local.html

@@ -21,17 +21,17 @@
 
 <LI>zero or more keywords may be appended 
 
-<LI>keyword = <I>theta</I> or <I>energy</I> 
+<LI>keyword = <I>theta</I> or <I>eng</I> 
 
 <PRE>  <I>theta</I> = tabulate angles
-  <I>energy</I> = tabulate angle energies 
+  <I>eng</I> = tabulate angle energies 
 </PRE>
 
 </UL>
 <P><B>Examples:</B>
 </P>
 <PRE>compute 1 all angle/local theta
-compute 1 all angle/local theta energy 
+compute 1 all angle/local eng theta 
 </PRE>
 <P><B>Description:</B>
 </P>
@@ -40,10 +40,16 @@ The number of datums generated, aggregated across all processors,
 equals the number of angles in the system.
 </P>
 <P>The local data stored by this command is generated by looping over all
-the atoms owned on a processor and their angles.  An angle will only be
+the atoms owned on a processor and their angles.  An angle will only
-included if all 3 atoms in the angle are in the specified compute group.
+be included if all 3 atoms in the angle are in the specified compute
+group.  Any angles that have been broken (see the
+<A HREF = "angle_style.html">angle_style</A> command) by setting their angle type to
+0 are not included.  Angles that have been turned off (see the <A HREF = "fix_shake.html">fix
+shake</A> or <A HREF = "delete_bonds.html">delete_bonds</A> commands) by
+setting their angle type negative are written into the file, but their
+energy will be 0.0.
 </P>
-<P>The output <I>theta</I> will be in degrees.  The output <I>energy</I> will be in
+<P>The output <I>theta</I> will be in degrees.  The output <I>eng</I> will be in
 energy <A HREF = "units.html">units</A>.
 </P>
 <P>Note that as atoms migrate from processor to processor, there will be

doc/compute_angle_local.txt

@@ -15,15 +15,15 @@ compute ID group-ID angle/local input1 input2 ... :pre
 ID, group-ID are documented in "compute"_compute.html command :ulb,l
 angle/local = style name of this compute command :l
 zero or more keywords may be appended :l
-keyword = {theta} or {energy} :l
+keyword = {theta} or {eng} :l
   {theta} = tabulate angles
-  {energy} = tabulate angle energies :pre
+  {eng} = tabulate angle energies :pre
 :ule
 
 [Examples:]
 
 compute 1 all angle/local theta
-compute 1 all angle/local theta energy :pre
+compute 1 all angle/local eng theta :pre
 
 [Description:]
 
@@ -32,10 +32,16 @@ The number of datums generated, aggregated across all processors,
 equals the number of angles in the system.
 
 The local data stored by this command is generated by looping over all
-the atoms owned on a processor and their angles.  An angle will only be
+the atoms owned on a processor and their angles.  An angle will only
-included if all 3 atoms in the angle are in the specified compute group.
+be included if all 3 atoms in the angle are in the specified compute
+group.  Any angles that have been broken (see the
+"angle_style"_angle_style.html command) by setting their angle type to
+0 are not included.  Angles that have been turned off (see the "fix
+shake"_fix_shake.html or "delete_bonds"_delete_bonds.html commands) by
+setting their angle type negative are written into the file, but their
+energy will be 0.0.
 
-The output {theta} will be in degrees.  The output {energy} will be in
+The output {theta} will be in degrees.  The output {eng} will be in
 energy "units"_units.html.
 
 Note that as atoms migrate from processor to processor, there will be

doc/compute_bond_local.html

@@ -21,17 +21,17 @@
 
 <LI>zero or more keywords may be appended 
 
-<LI>keyword = <I>distance</I> or <I>energy</I> 
+<LI>keyword = <I>dist</I> or <I>eng</I> 
 
-<PRE>  <I>distance</I> = tabulate bond distances
+<PRE>  <I>dist</I> = tabulate bond distances
-  <I>energy</I> = tablutate bond energies 
+  <I>eng</I> = tablutate bond energies 
 </PRE>
 
 </UL>
 <P><B>Examples:</B>
 </P>
-<PRE>compute 1 all bond/local energy
+<PRE>compute 1 all bond/local eng
-compute 1 all bond/local distance energy 
+compute 1 all bond/local dist eng 
 </PRE>
 <P><B>Description:</B>
 </P>
@@ -42,9 +42,14 @@ equals the number of bonds in the system.
 <P>The local data stored by this command is generated by looping over all
 the atoms owned on a processor and their bonds.  A bond will only be
 included if both atoms in the bond are in the specified compute group.
+Any bonds that have been broken (see the <A HREF = "bond_style.html">bond_style</A>
+command) by setting their bond type to 0 are not included.  Bonds that
+have been turned off (see the <A HREF = "fix_shake.html">fix shake</A> or
+<A HREF = "delete_bonds.html">delete_bonds</A> commands) by setting their bond type
+negative are written into the file, but their energy will be 0.0.
 </P>
-<P>The output <I>distance</I> will be in distance <A HREF = "units.html">units</A>.  The
+<P>The output <I>dist</I> will be in distance <A HREF = "units.html">units</A>.  The output
-output <I>energy</I> will be in energy <A HREF = "units.html">units</A>.
+<I>eng</I> will be in energy <A HREF = "units.html">units</A>.
 </P>
 <P>Note that as atoms migrate from processor to processor, there will be
 no consistent ordering of the entries within the local vector or array

doc/compute_bond_local.txt

@@ -15,15 +15,15 @@ compute ID group-ID bond/local input1 input2 ... :pre
 ID, group-ID are documented in "compute"_compute.html command :ulb,l
 bond/local = style name of this compute command :l
 zero or more keywords may be appended :l
-keyword = {distance} or {energy} :l
+keyword = {dist} or {eng} :l
-  {distance} = tabulate bond distances
+  {dist} = tabulate bond distances
-  {energy} = tablutate bond energies :pre
+  {eng} = tablutate bond energies :pre
 :ule
 
 [Examples:]
 
-compute 1 all bond/local energy
+compute 1 all bond/local eng
-compute 1 all bond/local distance energy :pre
+compute 1 all bond/local dist eng :pre
 
 [Description:]
 
@@ -34,9 +34,14 @@ equals the number of bonds in the system.
 The local data stored by this command is generated by looping over all
 the atoms owned on a processor and their bonds.  A bond will only be
 included if both atoms in the bond are in the specified compute group.
+Any bonds that have been broken (see the "bond_style"_bond_style.html
+command) by setting their bond type to 0 are not included.  Bonds that
+have been turned off (see the "fix shake"_fix_shake.html or
+"delete_bonds"_delete_bonds.html commands) by setting their bond type
+negative are written into the file, but their energy will be 0.0.
 
-The output {distance} will be in distance "units"_units.html.  The
+The output {dist} will be in distance "units"_units.html.  The output
-output {energy} will be in energy "units"_units.html.
+{eng} will be in energy "units"_units.html.
 
 Note that as atoms migrate from processor to processor, there will be
 no consistent ordering of the entries within the local vector or array

doc/compute_dihedral_local.html

@@ -0,0 +1,78 @@
+<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>compute dihedral/local command 
+</H3>
+<P><B>Syntax:</B>
+</P>
+<PRE>compute ID group-ID dihedral/local input1 input2 ... 
+</PRE>
+<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command 
+
+<LI>dihedral/local = style name of this compute command 
+
+<LI>zero or more keywords may be appended 
+
+<LI>keyword = <I>phi</I> 
+
+<PRE>  <I>phi</I> = tabulate dihedral angles 
+</PRE>
+
+</UL>
+<P><B>Examples:</B>
+</P>
+<PRE>compute 1 all dihedral/local phi 
+</PRE>
+<P><B>Description:</B>
+</P>
+<P>Define a computation that calculates properties of individual
+dihedrals.  The number of datums generated, aggregated across all
+processors, equals the number of angles in the system.
+</P>
+<P>The local data stored by this command is generated by looping over all
+the atoms owned on a processor and their dihedrals.  A dihedral will
+only be included if all 4 atoms in the dihedral are in the specified
+compute group.
+</P>
+<P>The output <I>phi</I> will be in degrees.
+</P>
+<P>Note that as atoms migrate from processor to processor, there will be
+no consistent ordering of the entries within the local vector or array
+from one timestep to the next.  The only consistency that is
+guaranteed is that the ordering on a particular timestep will be the
+same for local vectors or arrays generated by other compute commands.
+For example, dihedral output from the <A HREF = "compute_property_local.html">compute
+property/local</A> command can be combined
+with data from this command and output by the <A HREF = "dump.html">dump local</A>
+command in a consistent way.
+</P>
+<P><B>Output info:</B>
+</P>
+<P>This compute calculates a local vector or local array depending on the
+number of keywords.  The length of the vector or number of rows in the
+array is the number of dihedrals.  If a single keyword is specified, a
+local vector is produced.  If two or more keywords are specified, a
+local array is produced where the number of columns = the number of
+keywords.  The vector or array can be accessed by any command that
+uses local values from a compute as input.  See <A HREF = "Section_howto.html#4_15">this
+section</A> for an overview of LAMMPS output
+options.
+</P>
+<P><B>Restrictions:</B> none
+</P>
+<P><B>Related commands:</B>
+</P>
+<P><A HREF = "dump.html">dump local</A>, <A HREF = "compute_property_local.html">compute
+property/local</A>
+</P>
+<P><B>Default:</B> none
+</P>
+</HTML>

doc/compute_dihedral_local.txt

@@ -0,0 +1,68 @@
+"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
+
+compute dihedral/local command :h3
+
+[Syntax:]
+
+compute ID group-ID dihedral/local input1 input2 ... :pre
+
+ID, group-ID are documented in "compute"_compute.html command :ulb,l
+dihedral/local = style name of this compute command :l
+zero or more keywords may be appended :l
+keyword = {phi} :l
+  {phi} = tabulate dihedral angles :pre
+:ule
+
+[Examples:]
+
+compute 1 all dihedral/local phi :pre
+
+[Description:]
+
+Define a computation that calculates properties of individual
+dihedrals.  The number of datums generated, aggregated across all
+processors, equals the number of angles in the system.
+
+The local data stored by this command is generated by looping over all
+the atoms owned on a processor and their dihedrals.  A dihedral will
+only be included if all 4 atoms in the dihedral are in the specified
+compute group.
+
+The output {phi} will be in degrees.
+
+Note that as atoms migrate from processor to processor, there will be
+no consistent ordering of the entries within the local vector or array
+from one timestep to the next.  The only consistency that is
+guaranteed is that the ordering on a particular timestep will be the
+same for local vectors or arrays generated by other compute commands.
+For example, dihedral output from the "compute
+property/local"_compute_property_local.html command can be combined
+with data from this command and output by the "dump local"_dump.html
+command in a consistent way.
+
+[Output info:]
+
+This compute calculates a local vector or local array depending on the
+number of keywords.  The length of the vector or number of rows in the
+array is the number of dihedrals.  If a single keyword is specified, a
+local vector is produced.  If two or more keywords are specified, a
+local array is produced where the number of columns = the number of
+keywords.  The vector or array can be accessed by any command that
+uses local values from a compute as input.  See "this
+section"_Section_howto.html#4_15 for an overview of LAMMPS output
+options.
+
+[Restrictions:] none
+
+[Related commands:]
+
+"dump local"_dump.html, "compute
+property/local"_compute_property_local.html
+
+[Default:] none

doc/compute_improper_local.html

@@ -0,0 +1,78 @@
+<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>compute improper/local command 
+</H3>
+<P><B>Syntax:</B>
+</P>
+<PRE>compute ID group-ID improper/local input1 input2 ... 
+</PRE>
+<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command 
+
+<LI>improper/local = style name of this compute command 
+
+<LI>zero or more keywords may be appended 
+
+<LI>keyword = <I>chi</I> 
+
+<PRE>  <I>chi</I> = tabulate improper angles 
+</PRE>
+
+</UL>
+<P><B>Examples:</B>
+</P>
+<PRE>compute 1 all improper/local chi 
+</PRE>
+<P><B>Description:</B>
+</P>
+<P>Define a computation that calculates properties of individual improper
+interactions.  The number of datums generated, aggregated across all
+processors, equals the number of impropers in the system.
+</P>
+<P>The local data stored by this command is generated by looping over all
+the atoms owned on a processor and their impropers.  An improper will
+only be included if all 4 atoms in the improper are in the specified
+compute group.
+</P>
+<P>The output <I>chi</I> will be in degrees.
+</P>
+<P>Note that as atoms migrate from processor to processor, there will be
+no consistent ordering of the entries within the local vector or array
+from one timestep to the next.  The only consistency that is
+guaranteed is that the ordering on a particular timestep will be the
+same for local vectors or arrays generated by other compute commands.
+For example, improper output from the <A HREF = "compute_property_local.html">compute
+property/local</A> command can be combined
+with data from this command and output by the <A HREF = "dump.html">dump local</A>
+command in a consistent way.
+</P>
+<P><B>Output info:</B>
+</P>
+<P>This compute calculates a local vector or local array depending on the
+number of keywords.  The length of the vector or number of rows in the
+array is the number of impropers.  If a single keyword is specified, a
+local vector is produced.  If two or more keywords are specified, a
+local array is produced where the number of columns = the number of
+keywords.  The vector or array can be accessed by any command that
+uses local values from a compute as input.  See <A HREF = "Section_howto.html#4_15">this
+section</A> for an overview of LAMMPS output
+options.
+</P>
+<P><B>Restrictions:</B> none
+</P>
+<P><B>Related commands:</B>
+</P>
+<P><A HREF = "dump.html">dump local</A>, <A HREF = "compute_property_local.html">compute
+property/local</A>
+</P>
+<P><B>Default:</B> none
+</P>
+</HTML>

doc/compute_improper_local.txt

@@ -0,0 +1,68 @@
+"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
+
+compute improper/local command :h3
+
+[Syntax:]
+
+compute ID group-ID improper/local input1 input2 ... :pre
+
+ID, group-ID are documented in "compute"_compute.html command :ulb,l
+improper/local = style name of this compute command :l
+zero or more keywords may be appended :l
+keyword = {chi} :l
+  {chi} = tabulate improper angles :pre
+:ule
+
+[Examples:]
+
+compute 1 all improper/local chi :pre
+
+[Description:]
+
+Define a computation that calculates properties of individual improper
+interactions.  The number of datums generated, aggregated across all
+processors, equals the number of impropers in the system.
+
+The local data stored by this command is generated by looping over all
+the atoms owned on a processor and their impropers.  An improper will
+only be included if all 4 atoms in the improper are in the specified
+compute group.
+
+The output {chi} will be in degrees.
+
+Note that as atoms migrate from processor to processor, there will be
+no consistent ordering of the entries within the local vector or array
+from one timestep to the next.  The only consistency that is
+guaranteed is that the ordering on a particular timestep will be the
+same for local vectors or arrays generated by other compute commands.
+For example, improper output from the "compute
+property/local"_compute_property_local.html command can be combined
+with data from this command and output by the "dump local"_dump.html
+command in a consistent way.
+
+[Output info:]
+
+This compute calculates a local vector or local array depending on the
+number of keywords.  The length of the vector or number of rows in the
+array is the number of impropers.  If a single keyword is specified, a
+local vector is produced.  If two or more keywords are specified, a
+local array is produced where the number of columns = the number of
+keywords.  The vector or array can be accessed by any command that
+uses local values from a compute as input.  See "this
+section"_Section_howto.html#4_15 for an overview of LAMMPS output
+options.
+
+[Restrictions:] none
+
+[Related commands:]
+
+"dump local"_dump.html, "compute
+property/local"_compute_property_local.html
+
+[Default:] none