What should be the ramp values X and Y

LAMMPS LAMMPS Beginners
1

Hi All,

I want to set up the constant velocity of 0.5 A/ps for moving region along y direction

variable dy equal ramp(X,Y)
region laser cylinder z 100 20 50 11 51 move NULL v_dy NULL units box

What should be the ramp values X and Y

The timesteps is default (metal units) with 20000 run

2

The ramp() function is documented here: variable command — LAMMPS documentation

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4

This has nothing to do with the ramp() function, but only with how you use fix move.
Again, all the answers are in the documentation.

You will have to learn how to debug what you are doing yourself.
You should only post questions about these things here, if you have proper(!) proof that the documentation does not agree with the implementation (not impossible but very unlikely).
Everything else is an error of your own of not applying the functionality as documented.

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