Triangular matrix Application Object

A Triangular_matrix is a Table that has non-default terms in only one triangle.

EXPRESS specification:

*)
ENTITY Triangular_matrix
  SUBTYPE OF (Table);
  default  :  Maths_value;
  lower  : BOOLEAN;
END_ENTITY;
(*

Attribute definitions:

default: The default value for locations outside the specified triangle.

lower: The idicator for whether the lower (true) or the upper (false) triangle contains the non-default terms.

SELF/table.terms: The values of the non-default terms in the triangle specified by lower and in the order specified by SELF/table.order.