Unverified Commit 25a836b7 authored by Axel Kohlmeyer's avatar Axel Kohlmeyer
Browse files

reformat and rephrase text about availability of fix bond/create/angle only keyword

parent 52b30b11
Loading
Loading
Loading
Loading
+15 −14
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@

fix bond/create command
=======================

fix bond/create/angle command
=============================

@@ -116,16 +117,14 @@ actually created. The *fraction* setting must be a value between 0.0
and 1.0.  A uniform random number between 0.0 and 1.0 is generated and
the eligible bond is only created if the random number < fraction.

The *aconstrain* keyword is only available
when LAMMPS was built with the FixBondCreateAngle class.
It allows to specify a minimal and maximal angle
*amin* and *amax* between the two prospective bonding partners and a
third particle that is already bonded to one of the two partners.
Such a criterion can be important, for instance when new angle
potentials are simultaneously introduced after the formation of the
new bond. Without a restriction on the permissible angle, and for
stiffer angle potentials very large energies can arise and lead to
uncontrolled behavior.
The *aconstrain* keyword is only available with the fix
bond/create/angle command.  It allows to specify a minimal and maximal
angle *amin* and *amax* between the two prospective bonding partners and
a third particle that is already bonded to one of the two partners.
Such a criterion can be important when new angles are defined together
with the formation of a new bond.  Without a restriction on the
permissible angle, and for stiffer angle potentials, very large energies
can arise and lead to uncontrolled behavior.

Any bond that is created is assigned a bond type of *bondtype*.

@@ -235,12 +234,14 @@ You can dump out snapshots of the current bond topology via the :doc:`dump local

**Restart, fix_modify, output, run start/stop, minimize info:**

No information about this fix is written to :doc:`binary restart files <restart>`.  None of the :doc:`fix_modify <fix_modify>` options
are relevant to this fix.
No information about this fix is written to :doc:`binary restart files
<restart>`.  None of the :doc:`fix_modify <fix_modify>` options are
relevant to this fix.

This fix computes two statistics which it stores in a global vector of
length 2, which can be accessed by various :doc:`output commands <Howto_output>`.  The vector values calculated by this fix
are "intensive".
length 2, which can be accessed by various :doc:`output commands
<Howto_output>`.  The vector values calculated by this fix are
"intensive".

These are the 2 quantities: