Fuzzy Logic in MATLAB (Example 2)

Here we consider another example:

We need to establish the QUALITY OF TIPS in Restaurant received in result of determining FOOD and SERVICE quality.

To solve this example we use Matlab.

We type “fuzzy” in the Matlab command prompt.

Then in Edit tab we add additional input variable because we need to determine Food and Service quality. And in result we have 2 inputs: 

Then we open in Edit tab Membership Functions editor.

First input is Food quality. Let this input’s words a.k.a membership functions be:

    ·         Bad

    ·         Good

    ·         Excellent 

Second input is Service quality. Let this input’s words a.k.a membership functions be:

    ·         Weak

    ·         Average

    ·         Perfect

Our output variable is going to be Tips quality. Let this output’s words a.k.a membership functions be:

    ·         Poor

    ·         Ordinary

    ·         Great

In every input and output we put suitable for us Range and Params in which lays every membership function.

Then we have to open again in Edit tab Rule editor and build following rules due to our conception of received Tips. 

Then in View tab we choose Surface viewer which represents graphical result of our rules and membership functions.