Error on using tf function and rlocus

Hi

I'm trying to use this simple comand:

>> sys = tf([2 5 1],[1 2 3]);

>> rlocus(sys)

(it's the same as the example in Matlab tf page)

When I run these two lines Matlab diplays as follow:

The specified superclass 'numlti' contains a parse error, cannot be found on MATLAB's search path, or is shadowed by another file with the same name.

I try to search conflicts using

>> path

>> which -all <conflicting_function>

but he says '<conflicting_function>' not found.

How can I fix this?

Answer 1

[Star Strider]

The correct approach to finding potential overshadowing functions or variables is:

which -all tf

/MATLAB/toolbox/control/ctrlmodels/@tf/tf.m                 % tf constructor
/MATLAB/toolbox/control/ctrlmodels/@DynamicSystem/tf.m      % DynamicSystem method
/MATLAB/toolbox/ident/ident/@idParametric/tf.m              % idParametric method
/MATLAB/toolbox/mpc/mpc/@mpc/tf.m                           % mpc method
/MATLAB/toolbox/shared/controllib/engine/@StaticModel/tf.m  % StaticModel method

which -all rlocus

/MATLAB/toolbox/control/ctrlobsolete/rlocus.m
/MATLAB/toolbox/control/ctrldesign/@DynamicSystem/rlocus.m  % DynamicSystem method

and should only produce that sort of result.

Run these from a script or the Command Window:

restoredefaultpath

rehash toolboxcache

then try the example code again.

If it still fails, Contact Support.

.

[Filippo Colorio]

Thank you for the answer.

Unfortunately this does not work and displays the same error message.

Maybe i should contact the Matlab Support

Best regards.

[Star Strider]

My pleasure!

I hope MathWorks Support can solve this for you, since otherwise uninstalling and reinstalling MATLAB may be your only option.