UWALLS
This is part of the multicolvar module

Add lower walls to a vector of quantities

Depracated action: use UPPER_WALLS

Examples
Glossary of keywords and components
Description of components

By default this Action calculates the following quantities. These quantities can be referenced elsewhere in the input by using this Action's label followed by a dot and the name of the quantity required from the list below.

Quantity Description
bias the instantaneous value of the bias potential
force2 the instantaneous value of the squared force due to this bias potential
The atoms involved can be specified using
CATOMS all the angles between the bonds that radiate out from these central atom are computed. For more information on how to specify lists of atoms see Groups and Virtual Atoms
GROUP a list of angls between pairs of bonds connecting one of the atoms specified using the CATOM command and two of the atoms specified here are computed. For more information on how to specify lists of atoms see Groups and Virtual Atoms
Compulsory keywords
DATA the values you want to restrain
AT the radius of the sphere
KAPPA the force constant for the wall. The k_i in the expression for a wall.
OFFSET ( default=0.0 ) the offset for the start of the wall. The o_i in the expression for a wall.
EXP ( default=2.0 ) the powers for the walls. The e_i in the expression for a wall.
EPS ( default=1.0 ) the values for s_i in the expression for a wall
SWITCH the switching function specifies that only those bonds that have a length that is less than a certain threshold are considered