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# sbds_get_index(?Var, -Idx)

get the index of an SBDS attributed variable

Var
  SBDS variable
Idx
  The index of Var

## 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.