New trip ends (i.e. row and column totals) may be set interactively in three basic ways:
1) En masse via screen editing.
2) Individually using keyboard inputs.
3) From another matrix.
Under 1) the new totals may in turn be defined in three different ways:
a) As new absolute values;
b) As incremental changes,
c) As factors.
In addition these may be set by zones or by sectors (if defined). Thus if one is using factors by sector an input value of 1.1 for sector 1 origins would factor the origin (row) totals for all zones in sector 1 by 1.1. In all three cases the defaults are no change (current values, change = 0, factor = 1 respectively).
Keyboard input is longer and more laborious than screen editing but is fine for changing one or two totals or for subsequent use with key files.
Finally trip ends from one of the external matrices may be used to set trip ends for the internal matrix, an application of which is given in 10.19.1.