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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/variable.html
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@ -242,7 +242,7 @@ per-atom values from a file rather than from a formula. Variables of
style <em>python</em> 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 <em>internal</em> are used by a few
commands in LAMMPS which set their value directly.</p>
commands which set their value directly.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">As discussed in <a class="reference internal" href="Section_commands.html#cmd-2"><span class="std std-ref">Section 3.2</span></a> of the
@ -265,29 +265,25 @@ different values when it is evaluated at different times during a
simulation.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">When the input script line is encountered that defines a
variable of style <em>equal</em> or <em>vector</em> or <em>atom</em> or <em>python</em> that
contains a formula or Python code, the formula is NOT immediately
evaluated. It will be evaluated every time when the variable is
<strong>used</strong> instead. If you simply want to evaluate a formula in place you
can use as so-called. See the section below about &#8220;Immediate
Evaluation of Variables&#8221; for more details on the topic. This is also
true of a <em>format</em> style variable since it evaluates another variable
when it is invoked.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Variables of style <em>equal</em> and <em>vector</em> and <em>atom</em> can be used
as inputs to various other LAMMPS commands which evaluate their
formulas as needed, e.g. at different timesteps during a
<a class="reference internal" href="run.html"><span class="doc">run</span></a>.</p>
<p class="last">When an input script line is encountered that defines a variable
of style <em>equal</em> or <em>vector</em> or <em>atom</em> or <em>python</em> that contains a
formula or Python code, the formula is NOT immediately evaluated. It
will be evaluated every time when the variable is <strong>used</strong> instead. If
you simply want to evaluate a formula in place you can use as
so-called. See the section below about &#8220;Immediate Evaluation of
Variables&#8221; for more details on the topic. This is also true of a
<em>format</em> style variable since it evaluates another variable when it is
invoked.</p>
</div>
<p>Variables of style <em>equal</em> and <em>vector</em> and <em>atom</em> can be used as
inputs to various other commands which evaluate their formulas as
needed, e.g. at different timesteps during a <a class="reference internal" href="run.html"><span class="doc">run</span></a>.</p>
<p>Variables of style <em>internal</em> 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.</p>
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.</p>
<p>Variables of style <em>python</em> can be used in place of an equal-style
variable so long as the associated Python function, as defined by the
<a class="reference internal" href="python.html"><span class="doc">python</span></a> command, returns a numeric value. Thus any
@ -308,7 +304,7 @@ will override a corresponding index variable setting in the input
script.</p>
</div>
<p>There are two exceptions to this rule. First, variables of style
<em>string</em>, <em>getenv</em>, <em>equal</em>, <em>vector</em>, <em>atom</em>, <em>internal</em>, and
<em>string</em>, <em>getenv</em>, <em>internal</em>, <em>equal</em>, <em>vector</em>, <em>atom</em>, and
<em>python</em> 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