fotf error in step command

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salwan yousif
salwan yousif 2019-4-30
回答： Walter Roberson 2019-5-1
i tray to design toff control for magnetic levitation sys
i have problem when i use the following command
sys=fotf([2012.4087 107.2882 1.0305],[1.8063 0.93529 0],[1],[0]);
opt = stepDataOptions('InputOffset',-1.5,'StepAmplitude',-2);
figure(2)
figure(2)
step(sys,opt);
or
step(sys,100)
i get
Index exceeds the number of array elements (1).
Error in fotf/lsim (line 38)
h=t(2)-t(1);
Error in fotf/step (line 16)
y=lsim(G,u,t);
Error in test (line 4)
step(sys,opt);
Pleas your kind help and advice
  2 个评论
Stephen23
Stephen23 2019-5-1
salwan yousif's "Answer" moved here:
when i used this version 1.3 (2.31 MB) by Dingyu Xue i get the following error
Undefined operator '/' for input arguments of type 'ltioptions.step'.
Error in fotf/step (line 12)
if nargin==1, t=[0:0.2:10]'; elseif length(t)==1, t=0:t/100:t; end
Error in test (line 5)
step(sys,opt);

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回答（1 个）

Walter Roberson
Walter Roberson 2019-5-1
I see no evidence that stepDataOptions is supported for fotf()
fotf() is not tf(), and is not an extension of tf() . It is a separate third-party package.
The second input to step() for fotf() must be a time vector or else a scalar giving the frequency.

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