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Update fix_alchemy.rst

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Aidan Thompson
2023-02-27 11:00:11 -07:00
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doc/src/fix_alchemy.rst
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@ -81,15 +81,16 @@ This fix stores a global scalar (the current value of :math:`\lambda_p`)
and a global vector or length 3 which contains the potential energy of
the first partition, the second partition and the combined value,
respectively. The global scalar is unitless and "intensive", the vector
is in :doc:`energy units <units>` and "extensive". This values can be
is in :doc:`energy units <units>` and "extensive". These values can be
used by any command that uses a global value from a fix as input. See
the :doc:`Howto output <Howto_output>` doc page for an overview of
LAMMPS output options.
The value of :math:`\lambda_p` is influenced by the *start/stop* keywords
of the :doc:`run <run>` command. Without them it will be ramped
linearly from 1.0 to 0.0 or 0.0 to 1.0 during the steps of a run, with
*start/stop* keywords the ramp us from the *start* time step to the
linearly from 1.0 to 0.0 (partition 1) and 0.0 to 1.0 (partition 2)
during the steps of a run, with
*start/stop* keywords the ramp is from the *start* time step to the
*stop* timestep. This allows to break down a simulation over multiple
*run* commands or to continue transparently from a restart.