gensurfOptions

Option set for gensurf function

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Syntax

opt = gensurfOptions
opt = gensurfOptions(Name,Value)

Description

example

opt = gensurfOptions creates a default option set for generating a fuzzy inference system output surface using gensurf. Use dot notation to modify this option set for your specific application. Any options that you do not modify retain their default values.

example

opt = gensurfOptions(Name,Value) creates an option set with options specified by one or more Name,Value pair arguments.

Examples

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Open Live Script

Create a default gensurfOptions option set.

opt = gensurfOptions;

Specify options using dot notation. For example, for a two-input, three-output fuzzy system, specify options to:

  • Plot the surface for the second output against the values of the first and third inputs.

  • Specify a reference value of 0.25 for the second input variable.

opt.OutputIndex = 2;
opt.InputIndex = [1 3];
opt.ReferenceInputs = [NaN 0.25 NaN];

Any values you do not specify remain at their default values.

You can also specify one or more options when creating the option set. For example, create an option set, specifying 25 grid points for both plotted input variables:

opt2 = gensurfOptions('NumGridPoints',25);

Input Arguments

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Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: 'InputIndex',[2 3] plots the output against the second and third input variables using a 3-D surface plot.

Indices of input variables to plot the output against, specified as the comma-separated pair consisting of 'InputIndex' and one of the following:

  • Positive integer less than or equal to the number of inputs — Plot the output against a single input using a 2-D plot.

  • Two-element vector of positive integers — Plot the output against two input variables using a 3-D surface plot.

When InputIndex is 'auto', gensurf uses the first two input variables by default.

Index of output variable to plot, specified as the comma-separated pair consisting of 'OutputIndex' and a positive integer less than or equal to the number of outputs.

When OutputIndex is 'auto', gensurf uses the first output variable by default.

Number of grid points to plot, specified as the comma-separated pair consisting of 'NumGridPoints' and one of the following:

  • Integer greater than 1 — Specify the number of grid points when using a single input variable, or the same number of grid points for both inputs when using two inputs variables.

  • Two-element vector of integers greater than 1 — Specify a different number of grid points for each input variable.

If you specify InputIndex as an integer and NumGridPoints as a vector, then gensurf uses the first element of NumGridPoints as the number of grid points for the specified input variable.

To plot a smoother surface, increase the number of grid points.

Reference values for input variables not shown in the surface plot, specified as the comma-separated pair consisting of 'ReferenceInputs' and a vector with length equal to the number of FIS inputs. Specify NaN for the inputs specified in InputIndex.

When ReferenceInputs is 'auto', gensurf uses the midpoint of the range of each unused variable as a reference value.

Number of sample points to use when evaluating membership functions over the output variable range, specified as the comma-separated pair consisting of 'NumSamplePoints' and an integer greater than 1. For more information on membership function evaluation, see evalfis.

Note

NumSamplePoints is not used by Sugeno-type systems.

Output Arguments

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Option set for gensurf command, returned as a gensurfOptions option set.

See Also

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Introduced in R2017a

Fuzzy Logic Toolbox Documentation

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