Undefined function or variable 'matlabFunction'.

2017 4 3
2 个回答
更新时间：2017 4 4
3 次查看（30 天）

0 个投票

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!

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回答（2 个）

Star Strider
Star Strider 2017-4-3

0 个投票

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

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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
Star Strider 2017-4-3
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
编辑：Svyatoslav Kharitonov 2017-4-4
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
Star Strider 2017-4-4
See if rebooting MATLAB solves that problem.
Re-installation of MATLAB did solve the problem.

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Walter Roberson
Walter Roberson 2017-4-4

0 个投票

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

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