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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@9525 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp
2013-02-18 17:23:22 +00:00
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19
doc/variable.html
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@ -119,8 +119,8 @@ evaluation of the string. Note that the same string can generate
different values when it is evaluated at different times during a
simulation.
</P>
<P>IMPORTANT NOTE: When the input script line that defines a variable of
style <I>equal</I> or <I>atom</I> that contain a formula is encountered, the
<P>IMPORTANT NOTE: When the input script line is encountered that defines
a variable of style <I>equal</I> or <I>atom</I> that contains a formula, 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.
@ -724,10 +724,17 @@ produce only a global scalar or a per-atom vector, never both.
</P>
<P>There is a difference between referencing a variable with a leading $
sign (e.g. $x or ${abc}) versus with a leading "v_" (e.g. v_x or
v_abc). The former can be used in any command, including a variable
command, to force the immediate evaluation of the referenced variable
and the substitution of its value into the command. The latter is a
required kind of argument to some commands (e.g. the <A HREF = "fix_ave_spatial.html">fix
v_abc). The former can be used in any input script command, including
a variable command. The input script parser evaluates the reference
variable immediately and substitutes its value into the command. As
explained in <A HREF = "Section_commands.html#3_2">Section commands 3.2</A> for
"Parsing rules", you can also use un-named "immediate" variables for
this purpose. An variable reference such as
$((xlo+xhi)/2+sqrt(v_area)) evaluates the string between the
parenthesis as an equal-style variable.
</P>
<P>Referencing a variable with a leading "v_" is an optional or required
kind of argument for some commands (e.g. the <A HREF = "fix_ave_spatial.html">fix
ave/spatial</A> or <A HREF = "dump.html">dump custom</A> or
<A HREF = "thermo_style.html">thermo_style</A> commands) if you wish it to evaluate
a variable periodically during a run. It can also be used in a