Undefined function or variable 'matlabFunction'.

Dear all,

I am trying to use 'matlabFunction' feature to convert a symbolic expression into the function. I used an example, given in a help file:

    syms x y
r = sqrt(x^2 + y^2);
ht = matlabFunction(sin(r)/r, cos(r)/r)

However, what I always get, is a error message: Undefined function or variable 'matlabFunction'.

I am sure, Symbolic Math Toolbox is installed, cause in the uninstall menu all of the toolboxed as checked as available.

Any suggestions how to make it working?

Thank you in advance!

Answer 1

[Star Strider]

If you have the Symbolic Math Toolbox from R2008a or later, you will have matlabFunction.

[Svyatoslav Kharitonov]

MATLAB 2016a. I have even a corresponding file in the folder: \MATLAB\R2016a\toolbox\symbolic\symbolic

But still result is the same.

But if I check available toolboxes with a command VER, it is not listed. Can it be a problem?

[Star Strider]

See if running these lines from your Command Window (or a script) solves the problem:

restoredefaultpath 
rehash toolboxcache

Otherwise, you may need to Contact Tech Support.

[Svyatoslav Kharitonov]

Symbolic Math Toolbox has reappeared after the command, but now I am getting another error:

       An error occurred while trying to
  determine whether "sym" is a function
  name.

Error in Untitled (line 4)
syms x y

Caused by:
    Cannot redefine class 'sym' without
    a call to 'clear classes'.
  end

[Star Strider]

See if rebooting MATLAB solves that problem.

[Svyatoslav Kharitonov]

Re-installation of MATLAB did solve the problem.

Answer 2

[Walter Roberson]

A couple of people have reported this in the past for R2016a. The solution appears to be to reinstall the Symbolic Toolbox