ERROR: Illegal variable command: expected 3 arguments but found 4 (src/variable.cpp:447)

LAMMPS LAMMPS General Discussion
1

For lammps- reaxff force field - already optimized - Uniaxial stretching polymer

fix 1 all npt temp 300 300 0.1 y 0 0 1 z 0 0 1 drag 1
variable srate equal 1.0e10
variable srate1 equal “v_srate / 1.0e12”
fix 2 all deform 1 x erate ${srate1} units box remap x

ERROR: Illegal variable command: expected 3 arguments but found 4 (src/variable.cpp:447)
how to deal with it? which is the wrong argument?

2

Please always report which LAMMPS version you are using and what platform you are on?

Do you see any warnings in the output?

When I copy your two variable lines into an input with the 27 June 2024 version of LAMMPS, I don’t get an error, but the following warnings:

WARNING: Detected non-ASCII characters in input. Will try to continue by replacing with ASCII equivalents where known. (src/input.cpp:478)

It looks like your second variable command has non-ASCII characters as double quotes.

3

Thank you for answer! I have entered the correct double quotes already.
There is a new peoblem.

1724311111640(1)

1724311137643(1)

I dont know if it is the problem that i mentioned before which has 4 arguments not 3, or fix 2 has some problems.

4

This unreadable, please read the forum guidelines and learn how to correctly quote input file

5

This is a different problem. Just read the error message and study the LAMMPS documentation

6

ERROR: Illegal variable command: expected 3 arguments but found 5 (src/variable.cpp:449)
Last command: variable depth equal 85 - v_displace
can someone help me to solve this problem?

7

This kind of problem was reported and answered very recently: Why does my LAMMPS script fail with 'Illegal variable command