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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@13617 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp
2015-07-16 22:32:50 +00:00
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32
doc/variable.html
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@ -123,13 +123,13 @@ per-atom values from a file rather than from a formula. Variables can
be hooked to Python functions using code you provide, so that the
variable gets its value from the evaluation of the Python code.
</P>
<P>IMPORTANT NOTE: As discussed in <A HREF = "Section_commands.html#cmd_2">Section
3.2</A> of the manual, an input script can
use "immediate" variables, specified as $(formula) with parenthesis,
where the formula has the same syntax as equal-style variables
described on this page. This is a way to evaluate a formula
immediately without using the variable command to define a named
variable.
<P>IMPORTANT NOTE: As discussed in <A HREF = "Section_commands.html#cmd_2">Section 3.2</A>
of the manual, an input script can use "immediate" variables, specified
as $(formula) with parenthesis, where the formula has the same syntax
as equal-style variables described on this page. This is a convenient
way to evaluate a formula immediately without using the variable command
to define a named variable and then evaluate that variable. See below
for a more detailed discussion of this feature.
</P>
<P>In the discussion that follows, the "name" of the variable is the
arbitrary string that is the 1st argument in the variable command.
@ -144,10 +144,12 @@ simulation.
</P>
<P>IMPORTANT NOTE: When the input script line is encountered that defines
a variable of style <I>equal</I> or <I>atom</I> or <I>python</I> that contains a
formula or Python code, the formula is NOT immediately evaluated and
the result stored. See the discussion below about "Immediate
Evaluation of Variables" if you want to do this. This is also true of
the <I>format</I> style variable since it evaluates another variable when
formula or Python code, the formula is NOT immediately evaluated.
It will be evaluated every time when the variable is <B>used</B> 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 <I>format</I> style variable since it evaluates another variable when
it is invoked.
</P>
<P>IMPORTANT NOTE: Variables of style <I>equal</I> and <I>atom</I> can be used as
@ -161,14 +163,6 @@ can also use such a python-style variable. This means that when the
LAMMPS command evaluates the variable, the Python function will be
executed.
</P>
<P>When the input script line is encountered that defines
a variable of style <I>equal</I> or <I>atom</I> or <I>python</I> that contains a
formula or Python code, the formula is NOT immediately evaluated and
the result stored. See the discussion below about "Immediate
Evaluation of Variables" if you want to do this. This is also true of
the <I>format</I> style variable since it evaluates another variable when
it is invoked.
</P>
<P>IMPORTANT NOTE: When a variable command is encountered in the input
script and the variable name has already been specified, the command
is ignored. This means variables can NOT be re-defined in an input