10.5.4.3 Reading a Stacked Matrix by Single Records

A stacked matrix (10.2.4) be input via single records by either explicitly using the correct sequential row number or by including both the name of the O-D zones and the level. The input format must, however, be free-format.

For example, if a network of 100 zones has a trip matrix with three purposes (i.e., levels) then the sequential row numbers in the stacked matrix would go from 1 to 300. If the 5^th and 6^th sequential zones, say, had names 511 and 512 then an O-D trip record of 23.6 trips from 511 to 512 for purpose/level 3, could, using purely sequential notation, be written as:

215,6,23.4

Or, using both zone names plus a level, as:

5,6,3,23.4

However users may find it less complicated to input multiple-level trip matrices as a series of simple square, one-purpose matrices created one at a time and then to stack the resulting .ufm matrices into one large stacked matrix.