the definition of the group which uses the atom-style variable

Hello everyone:

I want to know whether the atom-style variable could definite the group. And I also want to know whether in the latest lammps, the dynamic group can be used by the compute or fix command.

I am having a problem in the definition of the group which uses the atom-style variable. I use the LAMMPS 64-bit 20150904. In the LAMMPS Manual, it refers that using the variable style, is a general way to flag specific atoms to include or exclude from a group. Following is the example:

compute 1 all pe/atom

compute 2 all reduce sum c_1

thermo_style custom step temp pe c_2

run 0

variable eatom atom “c_1 > -3.0”

group hienergy variable eatom

the example selects the atom which the atom potential energy greater than -3.0. However, when I run the code, there is an error"ERROR: Compute used in variable between runs is not current".

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