
sbds_get_index(?Var, -Idx)

   get the index of an SBDS attributed variable

Arguments
   Var                 SBDS variable
   Idx                 The index of Var

Type
   library(fd_sbds)

Description
	Unifies Idx with the index of the SBDS variable Var.  The index of
	the variable is its position in the matrix provided in the
	corresponding call to sbds_initialise/4 or sbds_initialise/5

Fail Conditions
   Var is not an SBDS variable.


