Expected floating point parameter in input script or data file

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1

Hi all,

I have been encountering this very problem lately in my code:

[…]
variable bodyfx atom mass*${gx}
fix pressure flow addforce bodyfx 0.0 0.0
[…]

The following error comes up:

ERROR: Expected floating point parameter in input script or data file

This must be something very simple, yet having tried all c_, v_ and f_ it doesn’t seem to work.

What am I missing?

Thanks,
Quang

2

http://lammps.sandia.gov/doc/fix_addforce.html

Fix addforce requires three floats (for x, y, and z direction).

Michal

3

Hi all,

I have been encountering this very problem lately in my code:

[...]
variable bodyfx atom mass*${gx}
fix pressure flow addforce bodyfx 0.0 0.0
[...]

The following error comes up:

ERROR: Expected floating point parameter in input script or data file

This must be something very simple, yet having tried all c_, v_ and f_ it
doesn't seem to work.

What am I missing?

​for starters you are not reporting your LAMMPS version.

axel.​

4

I have updated with the latest commit from github - still the same error.

I thought mass*${gx} shall be computed to a float? before I have

variable gx equal 1e-4

5

You probably want to read up on the syntax for variables:
http://lammps.sandia.gov/doc/variable.html

6

Ok I had a brain fart… clearly not enough espressos…

sorry…