>> R1=1; L=10e-3; C1=10e-6; R2=10; A=[-R1/L -1/L;1/C1 -1/(R2*C1)]; B=[1/L;0]; C=[0 1]; D=[0]; step(A,B,C,D),grid >> bode(A,B,C,D),grid ??? Error using ==> lti.bode at 95 Plots must be of the same type and size to be superimposed. Error in ==> bode a

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Harry 2013-9-13

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采纳的回答： Carla

what is the problem with bode comand

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Azzi Abdelmalek 2013-9-13

Please, format your question http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

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Answer 1

Carla 2013-9-13

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I do not get the error you see. Do you have a hold in between the step command and the bode command that you did not show here? It looks like you are trying to write the bode plot on the same axes as the step plot. Try this:

figure
step(A,B,C,D),grid
figure
bode(A,B,C,D),grid

This will plot the responses in separate figure windows.

Note also that this is a legacy syntax for step and bode; these commands are more powerful and flexible if you give them dynamic system input arguments: