addrule
Add a list of rules to an existing FIS structure and return the updated FIS.
Each row of the rule_matrix represents one rule and has the form:
[in1_mf ... inM_mf out1_mf ... outN_mf weight connect]
where:
| Element in Rule Vector | Expected Type or Value |
|---|---|
| in<i>_mf | membership function index for input i |
| out<j>_mf | membership function index for output j |
| weight | relative weight of the rule (0 <= weight <= 1) |
| connect | antecedent connective (1 == and; 2 == or) |
| Hedge String | Effect of Applying Hedge |
| "not" | prepend a minus sign to the membership function index |
| "somewhat" | append ".05" to the membership function index |
| "very" | append ".20" to the membership function index |
| "extremely" | append ".30" to the membership function index |
| "very very" | append ".40" to the membership function index |
| custom hedge | append .xy, where x.y is the degree to which the membership value should be raised, to the membership function index |
To omit an input or output, use 0 for the membership function index. The consequent connective is always "and".
For example, to express:
"If (input_1 is mf_2) or (input_3 is not mf_1) or (input_4 is very mf_1),
then (output_1 is mf_2) and (output_2 is mf_1^0.3)."
with weight 1, the corresponding row of rule_matrix would be:
[2 0 -1 4.2 2 1.03 1 2]
For a complete example that uses addrule, see heart_disease_demo_1.m.
See also: heart_disease_demo_1, showrule