help rlocus function graph

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marco sebastianelli 2017-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/361723-help-rlocus-function-graph

编辑： David Ding 2017-10-19

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 ??

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marco sebastianelli 2017-10-17

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 2017-10-17

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'.

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Answer 1

David Ding 2017-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/361723-help-rlocus-function-graph#answer_286644

编辑：David Ding 2017-10-19

在 MATLAB Online 中打开

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