help rlocus function graph

I have matlab R2017a with academic licenze, the function rlocus, rlocusplot, don't work, don't plot the graph, but matlab don t have error.what I can do ??

[KSSV]

What error it shows up? You have to specify the code and error you got to get help.

[marco sebastianelli]

mi code is: h = tf([1 2 3],[4 3 5]); rlocus(h); matlab no return error, appears the figure axis X axis Y but don't plot the graph

[marco sebastianelli]

but if use this code : h = tf([1 2 3],[4 3 5]); [R,K] = rlocus(h); message error is :Error using DynamicSystem/rlocus (line 51) Invalid MEX-file 'C:\Program Files\MATLAB\R2017a\toolbox\shared\controllib\engine\numerics\frkernel.mexw64': Missing dependent shared libraries: 'libmwslicot.dll' required by 'C:\Program Files\MATLAB\R2017a\toolbox\shared\controllib\engine\numerics\frkernel.mexw64'.

Answer 1

[David Ding]

Hi Marco,

I understand that the following code

>> h = tf([1 2 3],[4 3 5]); [R,K] = rlocus(h);

is giving you error in R2017a.

I was not able to reproduce this on my end in R2017a. Given the fact that the error points to a missing DLL file, your best bet would be to reinstall MATLAB and run the code again upon re-installation.

Hope this helps.

Thanks,

David