What is causing this error Undefined function or variable 'boolean'.

So basically my code was working fine for the longest time, then when I installed MATLAB r2017b on my home computer one of the functions in my script gives the following error: Undefined function or variable 'boolean'.

I am going to assume this is somethign to do with versions because it works on r2015b. Is there a fix for this?

Also the line it is referencing is: include_endpoints = boolean(include_endpoints);

Answer 1

[Guillaume]

The error message is clear. Your code use boolean (which could be a function or a variable) but it does not exists. There could be many reason for that which we can only guess at without seeing the code.

One possibility: in R2015b, you have added the folder which contains boolean.m to the path whereas you haven't done so in R2017b.

what does

which boolean -all

says in each version?

[Rik]

I recall vaguely that some versions also have a boolean function as a built-in, which has duplicate behavior of logical, but I can't find a reference to that in the release notes.

[Star Strider]

Correct. It may still exist in Simulink: https://stackoverflow.com/questions/22045291/difference-between-boolean-and-logical. There was no mention of boolean when I searched the Release Notes.