showrule

Display fuzzy inference system rules

Syntax

showrule(fis)

showrule(fis,Name=Value)

Description

showrule(fis) displays the rules in the fuzzy inference system fis.

showrule(fis,Name=Value) displays rules using options specified by one or more name-value arguments.

Examples

Display All Rules for Fuzzy Inference System

Load fuzzy inference system.

fis = readfis("tipper");

Display rules using linguistic expressions.

showrule(fis)

ans = 3×78 char array
    '1. If (service is poor) or (food is rancid) then (tip is cheap) (1)           '
    '2. If (service is good) then (tip is average) (1)                             '
    '3. If (service is excellent) or (food is delicious) then (tip is generous) (1)'

Display rules using symbolic expressions.

showrule(fis,Format="symbolic")

ans = 3×65 char array
    '1. (service==poor) | (food==rancid) => (tip=cheap) (1)           '
    '2. (service==good) => (tip=average) (1)                          '
    '3. (service==excellent) | (food==delicious) => (tip=generous) (1)'

Display rules using membership function indices.

showrule(fis,Format="indexed")

ans = 3×15 char array
    '1 1, 1 (1) : 2 '
    '2 0, 2 (1) : 1 '
    '3 2, 3 (1) : 2 '

Select Fuzzy Rules to Display

Load fuzzy inference system.

fis = readfis("tipper");

Display the first and third rules.

showrule(fis,RuleIndex=[1 3])

ans = 2×78 char array
    '1. If (service is poor) or (food is rancid) then (tip is cheap) (1)           '
    '3. If (service is excellent) or (food is delicious) then (tip is generous) (1)'

Display Fuzzy Rules in German Language

Load fuzzy inference system.

fis = readfis("tipper");

Display the rules in German using the 'deutsch' language.

showrule(fis,Language="deutsch")

ans = 3×85 char array
    '1. Wenn (service ist poor) oder (food ist rancid) dann (tip ist cheap) (1)           '
    '2. Wenn (service ist good) dann (tip ist average) (1)                                '
    '3. Wenn (service ist excellent) oder (food ist delicious) dann (tip ist generous) (1)'

Input Arguments

fis — Fuzzy inference system

mamfis object | sugfis object | mamfistype2 object | sugfistype2 object

Fuzzy inference system, specified as one of these objects:

• mamfis — Mamdani fuzzy inference system

• sugfis — Sugeno fuzzy inference system

• mamfistype2 — Type-2 Mamdani fuzzy inference system

• sugfistype2 — Type-2 Sugeno fuzzy inference system

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Example: showrule(fis,Format="symbolic")

RuleIndex — Rules to display

positive integer | vector of positive integers

Rules to display, specified as one of the following values.

• Positive integer — Index of a single rule to display

• Vector of positive integers — Indices of multiple rules to display

The default vector includes the indices for all the rules in fis.

Format — Rule format

"verbose" (default) | "symbolic" | "indexed"

Rule format, specified as one of the following values.

• "verbose" — Use linguistic expressions.

  'If (service is poor) or (food is rancid) then (tip is cheap) (1)'

  The rule weight is displayed in parentheses at the end of the rule.

  You can specify the rule language using the Language option.

• "symbolic" — Use language-neutral symbolic expressions.

  '(service==poor) | (food==rancid) => (tip=cheap) (1)'

  The symbolic rules use the following symbols.

  Rule Component	Symbol
  AND	&
  OR	|
  IS (in antecedent)	==
  IS (in consequent)	=
  IS NOT	~=
  Implication (then)	=>

  The rule weight is displayed in parentheses at the end of the rule.

• "indexed" — Use input and output membership function (MF) indices and integer representation of fuzzy operators.

  The indexed rules display in the following format:

  '<input MFs>, <output MFs>, (<weight>) : <logical operator - 1 (AND), 2 (OR)>'

  For example:

  '1 1, 1 (1) : 2'

  To indicate NOT operations for input and output membership functions, the software uses negative indices. For example, to indicate "not the second membership function," the software uses -2.

  To indicate a don’t care condition for an input or output membership function, the software uses 0.

Language — Rule language

"english" (default) | "francais" | "deutsch"

Rule language for "verbose" format, specified as one of the following values.

• "english" — Display rules in English.

  'If (service is poor) or (food is rancid) then (tip is cheap) (1)'

• "francais" — Display rules in French.

  'Si (service est poor) ou (food est rancid) alors (tip est cheap) (1)'

• "deutsch" — Display rules in German.

  'Wenn (service ist poor) oder (food ist rancid) dann (tip ist cheap) (1)'

The software displays the FIS rules using the following keywords.

Rule Component	English	French	German
Start of antecedent	if	si	wenn
AND	and	et	und
OR	or	ou	oder
Start of consequent (implication)	then	alors	dann
IS	is	est	ist
IS NOT	is not	n''est_pas	ist nicht

Version History

Introduced before R2006a

R2019b: Support for fuzzy inference system structures will be removed

Support for representing fuzzy inference systems as structures will be removed in a future release. Use mamfis and sugfis objects with this function instead. To convert existing fuzzy inference system structures to objects, use the convertfis function.

This change was announced in R2018b. Using fuzzy inference system structures with this function issues a warning starting in R2019b.

R2017a: Specify options using name-value pair arguments

To specify options for viewing the rules of a fuzzy inference system, you now use name-value pair arguments. Any name-value pair arguments that you do not specify remain at their default values.

Previously, you specified options using optional input arguments indexList, format, and lang.

showrule(fis,indexList,format,lang);

Starting in R2017a, modify your code to use one or more name-value pair arguments. For example, view the first fuzzy rule in fis.

showrule(fis,'RuleIndex',1);

The following table shows the mapping of the old input arguments to the new name-value pair arguments.

Old showrule Input Argument	New Name-Value Argument
indexList	'RuleIndex'
format	'Format'
lang	'Language'