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@ -489,10 +489,15 @@ each time the variable is used. If you want spaces in the string,
enclose it in double quotes so the parser will treat it as a single
argument. For <em>equal</em>-style variables the formula computes a scalar
quantity, which becomes the value of the variable whenever it is
evaluated. For <em>vector</em>-style variables the formula computes a vector
of quantities, which becomes the value of the variable whenever it is
evaluated. For <em>atom</em>-style variables the formula computes one
quantity for each atom whenever it is evaluated.</p>
evaluated. For <em>vector</em>-style variables the formula must compute a
vector of quantities, which becomes the value of the variable whenever
it is evaluated. The calculated vector can be on length one, but it
cannot be a simple scalar value like that produced by an equal-style
compute. I.e. the formula for a vector-style variable must have at
least one quantity in it that refers to a global vector produced by a
compute, fix, or other vector-style variable. For <em>atom</em>-style
variables the formula computes one quantity for each atom whenever it
is evaluated.</p>
<p>Note that <em>equal</em>, <em>vector</em>, and <em>atom</em> variables can produce
different values at different stages of the input script or at
different times during a run. For example, if an <em>equal</em> variable is
@ -996,11 +1001,10 @@ produce a scalar, vector, or array.</p>
<p>An equal-style variable can only use scalar values, which means a
global scalar, or an element of a global or per-atom vector or array.
A vector-style variable can use scalar values or a global vector of
values, or a column of a global array of values, Atom-style variables
values, or a column of a global array of values. Atom-style variables
can use global scalar values. They can also use per-atom vector
values. A vector value can be a per-atom vector itself, or a column
of a per-atom array. See the doc pages for individual computes to see
what kind of values they produce.</p>
values, or a column of a per-atom array. See the doc pages for
individual computes to see what kind of values they produce.</p>
<p>Examples of different kinds of compute references are as follows.
There is typically no ambiguity (see exception below) as to what a
reference means, since computes only produce either global or per-atom
@ -1116,19 +1120,22 @@ elsewhere in the input script.</p>
global numeric value, vector-style variables gerarate a vector of
global numeric values, and atom-style and atomfile-style variables
generate a per-atom vector of numeric values. All other variables
store one or more strings. A vector-style variable can be referenced
wtih a</p>
store one or more strings.</p>
<p>The formula for an equal-style variable can use any style of variable
including a vector_style or atom-style or atomfile-style. In these
latter cases, a subscript must be used to access a single value from
including a vector_style or atom-style or atomfile-style. For these
3 styles, a subscript must be used to access a single value from
the vector-, atom-, or atomfile-style variable. If a string-storing
variable is used, the string is converted to a numeric value. Note
that this will typically produce a 0.0 if the string is not a numeric
string, which is likely not what you want.</p>
<p>The formula for a vector-style variable can use any style of variable,
including atom-style or atomfile-style variables. For these 2 styles,
a subscript must be used to access a single value from the atom-, or
atomfile-style variable.</p>
<p>The formula for an atom-style variable can use any style of variable,
including other atom-style or atomfile-style variables.</p>
<p>The formula for an atom-style variable can use any style of variable,
including other atom-style or atomfile-style variables.</p>
including other atom-style or atomfile-style variables. If it uses a
vector-style variable, a subscript must be used to access a single
value from the vector-style variable.</p>
<p>Examples of different kinds of variable references are as follows.
There is no ambiguity as to what a reference means, since variables
produce only a global scalar or global vector or per-atom vector.</p>