problem with ramping diameter

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1

Hello,
I'd like to ramp the diameter of particles within the region reg1 by these commands:

variable dia equal ramp(0.03,0.04)
region reg1 block -0.7 0.7 -1.5 -1.4 -0.0002 0.002 units box
run 50000 start 1000 stop 500000 every 1000 "set region reg1 diameter ${dia}"

Unfortunately, I get this error:
"Group ID in variable formula does not exist"

Can anybody help me? Where is the problem?

Thanks in advance,
kind regards,

Sebastian

2

Putting these commands at the end of the bench/in.lj script works
as expected:

variable dia equal ramp(0.03,0.04)
region reg1 block -0.7 0.7 -1.5 -1.4 -1 1 units box
run 100 start 0 stop 100 every 10 "print ${dia}"

Are you using the current version of LAMMPS?

Steve