Why mamfistype2 function is undefined?

I run the function mamfistype2 according to https://uk.mathworks.com/help/fuzzy/mamfistype2.html.

fis = mamfistype2;

But this is what I get:

'Undefined function or variable 'mamfistype2'.

Does anyone know why this happen?

[SL: fixed hyperlink by removing trailing period]

Answer 1

[Ameer Hamza]

function mamfistype2 requires the Fuzzy Logic Toolbox. Run the following lines to check if the toolbox is installed

ver fuzzy

If you get the follow output, then you need to install the toolbox

Warning: No properly formatted Contents.m file was found for 'fuzzy'. 

[muhammad muda]

I run the lines you gave and this is what I got:

Fuzzy Logic Toolbox Version 2.4 (R2018b)

Seems like I already have the toolbox. Is it because of my Matlab version?

[Steven Lord]

Fuzzy Logic Toolbox not being installed is one reason this class may not be available. It was introduced in release R2019b according to the note at the end of its documentation page, so if the user has an older release installed that would also explain why it is not available.

[muhammad muda]

OK now I understand. Thank you for the answer.

Answer 2

[Mohamed Elshami]

releases before 2018 can not complie this command, former vesrsions used (newfis) to define a fuzzy system

read (vesion history) section at this link:

https://www.mathworks.com/help/fuzzy/newfis.html#mw_621232f3-e902-4cf4-b743-b69462696008