update

Update fuzzy rule using fuzzy inference system

Syntax

ruleOut = update(ruleIn,fis)

Description

ruleOut = update(ruleIn,fis) updates the fuzzy rule ruleIn using the information in fuzzy inference system fis and returns the resulting fuzzy rule in ruleOut.

Examples

Create Fuzzy Rule Using Text Description

Create a fuzzy rule using a verbose text description.

rule = fisrule("if service is poor and food is delicious then tip is average (1)");

Alternatively, you can specify the same rule using a symbolic text description.

rule = fisrule("service==poor & food==delicious => tip=average")

rule = 
  fisrule with properties:

    Description: "service==poor & food==delicious => tip=average (1)"
     Antecedent: []
     Consequent: []
         Weight: 1
     Connection: 1

Before using rule with a fuzzy system, update the rule Antecedent and Consequent properties using the update function.

fis = readfis("tipper");
rule = update(rule,fis)

rule = 
  fisrule with properties:

    Description: "service==poor & food==delicious => tip=average (1)"
     Antecedent: [1 2]
     Consequent: 2
         Weight: 1
     Connection: 1

Create Fuzzy Rule Using Numeric Description

Create a fuzzy rule using a numeric description. Specify that the rule has two input variables.

rule = fisrule([1 2 2 0.5 1],2)

rule = 
  fisrule with properties:

    Description: "input1==mf1 & input2==mf2 => output1=mf2 (0.5)"
     Antecedent: [1 2]
     Consequent: 2
         Weight: 0.5000
     Connection: 1

Before using rule with a fuzzy system, update the rule Description property using the update function.

fis = readfis("tipper");
rule = update(rule,fis)

rule = 
  fisrule with properties:

    Description: "service==poor & food==delicious => tip=average (0.5)"
     Antecedent: [1 2]
     Consequent: 2
         Weight: 0.5000
     Connection: 1

Input Arguments

ruleIn — Fuzzy rule

fisrule object | array of fisrule objects

Fuzzy rule, specified as a fisrule object or an array of fisrule objects. If ruleIn was created using a:

• Text description, its Antecedent and Consequent properties are updated using the input and output membership function indices in fis that correspond to the membership function names in the Description property of ruleIn

• Numeric description, its Description property is updated using the input and output membership function names in fis that correspond to the membership function indices in the Antecedent and Consequent properties of ruleIn

If you specify ruleIn as an array of fisrule objects, then all of the rules are updated accordingly.

fis — Fuzzy inference system

mamfis object | sugfis object | mamfistype2 object | sugfistype2 object

Fuzzy inference system, specified as one of the following:

• mamfis object — Mamdani fuzzy inference system

• sugfis object — Sugeno fuzzy inference system

• mamfistype2 object — Type-2 Mamdani fuzzy inference system

• sugfistype2 object — Type-2 Sugeno fuzzy inference system

Output Arguments

ruleOut — Fuzzy rule

fisrule object | array of fisrule objects

Fuzzy rule, returned as a fisrule object or an array of fisrule objects.