Assigns every node in the input network an index number, such that nodes in the same layer will be labeled with consecutive indices in left to right order. All consecutive layout operations will preserve or update the indices. In addition, the indices array is initialized such that indices[layer] indicates the number of nodes in the layer. Finally, the variables minIndexLayer and maxIndexLayer record the layers that correspond to the minimum and maximum nodes in a layer.

protected virtual void InitializeIndices()