	This is part of the adjmat module
	It is only available if you configure PLUMED with ./configure –enable-modules=adjmat . Furthermore, this feature is still being developed so take care when using it and report any problems on the mailing list.

Calculate a matrix with elements equal to one if there is a bridging atom between the two atoms

Quantity	Description
.#!value	the number of bridging atoms between the two groups

GROUP	the atoms for which you would like to calculate the adjacency matrix. For more information on how to specify lists of atoms see Groups and Virtual Atoms
GROUPA	. For more information on how to specify lists of atoms see Groups and Virtual Atoms
GROUPB	. For more information on how to specify lists of atoms see Groups and Virtual Atoms
BRIDGING_ATOMS	The list of atoms that can form the bridge between the two interesting parts of the structure.. For more information on how to specify lists of atoms see Groups and Virtual Atoms

SWITCH	The parameters of the two switchingfunction in the above formula
SWITCHA	The switchingfunction on the distance between bridging atoms and the atoms in group A
SWITCHB	The switchingfunction on the distance between the bridging atoms and the atoms in group B