rlocus throws up error

(I have no idea, either. I never encountered a similar situation with the Control System Toolbox, however re-starting MATLAB has solved similar problems in my experience.)

As always, my pleasure!

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Answer 2

Paul 2021-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/894232-rlocus-throws-up-error#answer_762837

编辑：Paul 2021-8-7

在 MATLAB Online 中打开

Seems to work fine:

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

rlocus(sys);

You might have a different function tf() or rlocus() that is shadowing the same from the Control System Toolbox. Do you see these results in repsonse to a which() command?

which tf -all
/MATLAB/toolbox/control/ctrlmodels/@tf/tf.m                     % tf constructor
/MATLAB/toolbox/control/ctrlmodels/@DynamicSystem/tf.m          % Shadowed DynamicSystem method
/MATLAB/toolbox/shared/controllib/engine/+ltipack/@tfdata/tf.m  % Shadowed ltipack.tfdata method
/MATLAB/toolbox/shared/controllib/engine/+ltipack/@ssdata/tf.m  % Shadowed ltipack.ssdata method
/MATLAB/toolbox/mpc/mpc/@mpc/tf.m                               % Shadowed mpc method
/MATLAB/toolbox/ident/ident/@idParametric/tf.m                  % Shadowed idParametric method
/MATLAB/toolbox/shared/controllib/engine/@StaticModel/tf.m      % Shadowed StaticModel method
which rlocus -all
/MATLAB/toolbox/control/ctrlobsolete/rlocus.m
/MATLAB/toolbox/control/ctrldesign/@DynamicSystem/rlocus.m                % Shadowed DynamicSystem method
/MATLAB/toolbox/shared/controllib/engine/+ltipack/@ltidata/rlocus.m       % Shadowed ltipack.tfdata method
/MATLAB/toolbox/shared/controllib/graphics/@resppack/@ltisource/rlocus.m  % Shadowed resppack.ltisource method