why the bode function doesn't work?

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jia ming chen
jia ming chen2015-1-19
回答: Felix Götze ,2016-2-9
this is my problem...
>> s=tf('s')
s =
Continuous-time transfer function.
>> g=1/(1+s)
g =
s + 1
Continuous-time transfer function.
>> bode(g) Error using DynamicSystem/bode (line 97) Index exceeds matrix dimensions.
can anyone solve it?

回答(3 个)

Felix Götze
Felix Götze 2016-2-9
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.

Youssef  Khmou
Youssef Khmou 2015-1-19
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);
  2 个评论
Youssef  Khmou
Youssef Khmou 2015-1-20
编辑:Youssef Khmou 2015-1-20
Bode function contains the following code from line 92 through 100
92 case 3
93 % Transfer function form with time vector
94 if size(a,1)>1,
95 % SIMO syntax
96 a = num2cell(a,2);
97 den = b;
98 b = cell(size(a,1),1);
99 b(:) = {den};
100 end


Andreas Goser
Andreas Goser 2015-1-20
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.
  2 个评论
Andreas Goser
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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