{thresh} args = attribute operation value

    attribute = same attributes (x,fy,etotal,sxx,etc) used by dump custom style

    operation = "<" or "<=" or ">" or ">=" or "==" or "!=" or "|^"

    value = numeric value to compare to

    value = numeric value to compare to, or LAST

    these 3 args can be replaced by the word "none" to turn off thresholding

  {unwrap} arg = {yes} or {no} :pre

these keywords apply only to the {image} and {movie} "styles"_dump_image.html :l

attributes that can be tested for are the same as those that can be

specified in the "dump custom"_dump.html command, with the exception

of the {element} attribute, since it is not a numeric value.  Note

that different attributes can be output by the "dump custom"_dump.html

command than are used as threshold criteria by the dump_modify

command.  E.g. you can output the coordinates and stress of atoms

whose energy is above some threshold.

that a different attributes can be used than those output by the "dump

custom"_dump.html command.  E.g. you can output the coordinates and

stress of atoms whose energy is above some threshold.

If an atom-style variable is used as the attribute, then it can

produce numeric or Boolean 0/1 values.  The latter can be generated by

formulas that use comparison or Boolean math operators or special

functions like gmask() and rmask() and grmask().  See the

"variable"_variable.html command doc page for details.

produce continuous numeric values or effective Boolean 0/1 values

which may be useful for the comparision operation.  Boolean values can

be generated by variable formulas that use comparison or Boolean math

operators or special functions like gmask() and rmask() and grmask().

See the "variable"_variable.html command doc page for details.

NOTE: The LAST option, discussed below, is not yet implemented.  It

will be soon.

The specified value must be a simple numeric value or the word LAST.

If LAST is used, it refers to the value of the attribute the last time

This will dump atoms which have crossed the periodic x boundary of the

simulation box since the last dump.  (Note that atoms that crossed

and then crossed back between the two dumps would not be included.)

once and then crossed back between the two dump timesteps would not be

included.)

region foo sphere 10 20 10 15 

variable inregion atom rmask(foo)