plotfis

Display fuzzy inference system

Syntax

plotfis(fis)

plotfis(tree)

plotfis(tree,Legend="on")

Description

FIS Object

plotfis(fis) displays a high-level diagram of a type-1 or type-2 fuzzy inference system (FIS). The center of the display shows the name, type, and rule count for the FIS. The input variables with their associated membership functions are displayed on the left, and the outputs with their associated membership functions are displayed on the right.

FIS Tree

Since R2021b

plotfis(tree) displays a high-level diagram of a tree of interconnected FIS objects. The display shows the inputs, outputs, component FIS objects, and connections of the specified fistree object.

plotfis(tree,Legend="on") displays information about the inputs, outputs, and connections of the specified fistree object by adding a legend to the display.

Examples

Display Fuzzy Inference System

Create a fuzzy inference system (FIS). For this example, read the FIS from the tipper.fis file.

fis = readfis('tipper');

Display the fuzzy system.

plotfis(fis)

The figure shows the FIS name and type, along with the number of rules. Also, for each input and output variable, the name and membership function configuration are shown.

Display Tree of Fuzzy Inference Systems

Since R2021b

Load a FIS tree for a weighted tipper system with three inputs and one output.

load("weightedTipper")

Display the fistree object with a legend.

plotfis(weightedTipper,Legend="on")

In this display, free inputs are the inputs without any incoming connections. You must specify these inputs when you evaluate the FIS tree. The free and intermediate output values are returned when you evaluate the FIS tree.

You can also plot the FIS tree without a legend.

plotfis(weightedTipper)

Input Arguments

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

tree — Tree of interconnected fuzzy inference systems

fistree object

Since R2021b

Tree of interconnected fuzzy inference systems, specified as a fistree object.

Alternative Functionality

App

You can interactively view the high-level structure of a FIS using the Fuzzy Logic Designer app.

Version History

Introduced before R2006a

R2021b: Visual representation of FIS trees

Starting in R2021b, the plotfis function displays a visual representation of a FIS tree. Previously, plotfis displayed a summary of the FIS tree properties in the MATLAB^® Command Window. This information is no longer available in the Command Window when using plotfis.

To obtain information about the FIS tree components, inputs, outputs, and connections, access the properties of the fistree object using dot notation.

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.