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addInput

Add input variable to fuzzy inference system

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Syntax

fisOut = addInput(fisIn)
fisOut = addInput(fisIn,range)
fisOut = addInput(___,Name,Value)

Description

fisOut = addInput(fisIn) adds a default input variable to fisIn and returns the resulting fuzzy system in fisOut. This input variable has a default name, default range, and no membership functions.

example

fisOut = addInput(fisIn,range) adds an input variable with the specified range.

fisOut = addInput(___,Name,Value) configures the input variable using one or more name-value pair arguments.

example

Examples

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Open Live Script

Create a Sugeno fuzzy inference system.

fis = sugfis("Name","tipper");

Add an input variable with default specifications.

fis = addInput(fis);

You can configure the input variable properties using dot notation. For example, specify the name and range for the variable.

fis.Inputs(1).Name = "service";
fis.Inputs(1).Range = [0 10];

View the input variable.

fis.Inputs(1)
ans = 
  fisvar with properties:

                   Name: "service"
                  Range: [0 10]
    MembershipFunctions: [0x0 fismf]

You can also specify a variable name and range when you add it to the fuzzy system.

fis2 = sugfis("Name","tipper");
fis2 = addInput(fis2,[0 10],"Name","service");
Open Live Script

Create a fuzzy inference system.

fis = mamfis('Name',"tipper");

Add an input variable with three Gaussian membership functions distributed over the input range.

fis = addInput(fis,'NumMFs',3,'MFType',"gaussmf");

View the membership functions.

plotmf(fis,'input',1)

Figure contains an axes object. The axes object with xlabel input1, ylabel Degree of membership contains 6 objects of type line, text.

Input Arguments

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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

Variable range, specified as a two-element element vector where the first element is less than the second element. The first element specifies the lower bound of the range, and the second element specifies the upper bound of the range.

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: fis = addInput(fis,NumMFs=3)

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: fis = addInput(fis,'NumMFs',3)

Variable name, specified as a string or character vector. The default variable name is "input<uniqueIndex>", where uniqueIndex is automatically generated based on the current number of inputs in fisIn.

Number of membership functions, specified as a nonnegative integer.

Membership function type, specified as one of the following values.

  • "trimf" — Triangular membership functions

  • "gaussmf" — Gaussian membership functions

The membership functions are uniformly distributed over the input variable range with approximately 80% overlap in the membership function supports.

Output Arguments

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Updated fuzzy inference system, returned as one of the following objects.

  • 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

fisOut contains the added input variable, with all other properties matching the properties of fisIn.

Version History

Introduced in R2018b

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See Also

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