why the bode function doesn't work?

I had the same Problem. In my case the error occured because I had a figure window open. If you have an open figure close it and try the command again it should work properly now.

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Answer 2

Youssef Khmou 2015-1-19

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编辑：Youssef Khmou 2015-1-19

The description is correct and the code is working correctly,try clearing the existing variables

 clear all;
 s=tf('s'); g=1/(1+s); bode(g);

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Youssef Khmou 2015-1-20

编辑：Youssef Khmou 2015-1-20

Bode function contains the following code from line 92 through 100

case 3
 % Transfer function form with time vector
 if size(a,1)>1,
    % SIMO syntax
    a = num2cell(a,2);
   den = b;
    b = cell(size(a,1),1);
    b(:) = {den};
 end

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Answer 3

Andreas Goser 2015-1-20

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Can you verify the output of

which bode -all

Youe should get something like this:

C:\Program Files\MATLAB\R2014b\toolbox\control\ctrlobsolete\bode.m
C:\Program Files\MATLAB\R2014b\toolbox\shared\controllib\engine\@DynamicSystem\bode.m  % DynamicSystem method

Is not, there maybe another function or variable shadowing the bode function you want.

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Andreas Goser 2015-3-19

This user had a different error message. The solution was a compatibility with a 3rd part toolbox. Once this was removed from the path, BODE was working fine.

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