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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@15450 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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2016-08-05 18:16:10 +00:00
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doc/html/_sources/variable.txt
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@ -124,7 +124,7 @@ per-atom values from a file rather than from a formula. Variables of
style *python* can be hooked to Python functions using code you
provide, so that the variable gets its value from the evaluation of
the Python code. Variables of style *internal* are used by a few
commands in LAMMPS which set their value directly.
commands which set their value directly.
.. note::
@ -149,29 +149,26 @@ simulation.
.. note::
When the input script line is encountered that defines a
variable of style *equal* or *vector* or *atom* or *python* that
contains a formula or Python code, the formula is NOT immediately
evaluated. It will be evaluated every time when the variable is
**used** instead. If you simply want to evaluate a formula in place you
can use as so-called. See the section below about "Immediate
Evaluation of Variables" for more details on the topic. This is also
true of a *format* style variable since it evaluates another variable
when it is invoked.
When an input script line is encountered that defines a variable
of style *equal* or *vector* or *atom* or *python* that contains a
formula or Python code, the formula is NOT immediately evaluated. It
will be evaluated every time when the variable is **used** instead. If
you simply want to evaluate a formula in place you can use as
so-called. See the section below about "Immediate Evaluation of
Variables" for more details on the topic. This is also true of a
*format* style variable since it evaluates another variable when it is
invoked.
.. note::
Variables of style *equal* and *vector* and *atom* can be used
as inputs to various other LAMMPS commands which evaluate their
formulas as needed, e.g. at different timesteps during a
:doc:`run <run>`.
Variables of style *equal* and *vector* and *atom* can be used as
inputs to various other commands which evaluate their formulas as
needed, e.g. at different timesteps during a :doc:`run <run>`.
Variables of style *internal* can be used in place of an equal-style
variable, except by commands that set the value in the internal-style
variable. Thus any command that states it can use an equal-style
variable as an argument, can also use an internal-style variable.
This means that when the LAMMPS command evaluates the variable, it
will use the value set (internally) by another LAMMPS command.
variable, except by commands that set the value stored by the
internal-style variable. Thus any command that states it can use an
equal-style variable as an argument, can also use an internal-style
variable. This means that when the command evaluates the variable, it
will use the value set (internally) by another command.
Variables of style *python* can be used in place of an equal-style
variable so long as the associated Python function, as defined by the
@ -194,7 +191,7 @@ executed.
script.
There are two exceptions to this rule. First, variables of style
*string*\ , *getenv*\ , *equal*\ , *vector*\ , *atom*\ , *internal*\ , and
*string*\ , *getenv*\ , *internal*\ , *equal*\ , *vector*\ , *atom*\ , and
*python* ARE redefined each time the command is encountered. This
allows these style of variables to be redefined multiple times in an
input script. In a loop, this means the formula associated with an