getCurvature function doesn't exists.

Hello. I am working on matlb R2018a and using Lane keeping asistent system using model predictive control. one of the demends of the system is to put a curvature by using that function getCurvature(Vx,time). This function is written in the help center on the page of the LKAsystem... but my matlab doesn't succsess to open that function. The specific commend is that: Undefined function or variable 'getCurvature'. My question is what else can I do??

[Star Strider]

It appears that you are using a demo or example from the current online documentation for R2019b, although I do not recognise the one ou want to use. If you have an earler version, you may not have that demo. To find out, see the documentation for the demo function.