On-screen editing of individual cell values follows the same procedures as described under 10.10.4.
Alternatively screen editing can be performed at the sector-to-sector level, there being two options for “converting” a sector-to-sector cell value into its constituent zone-to-zone cells:
where ij refers to zones within sectors I and J.
Thus under 1) all ij cell values equal the sector IJ values; this would be appropriate if the matrix elements are, e.g. costs, which apply equally to all cells within a sector.
Under option 2) ij cells are factored by a sector-to-sector constant FIJ such that the new ij elements sum to the new IJ values. This would be more appropriate for, e.g., trip matrices where the elements are “additive”.