working with transfer function, overflow error

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upna fruit 2013-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/76452-working-with-transfer-function-overflow-error

I am working with a transfer function that modelates a MIMO system of 15 inputs and 15 outputs. I have to perform the following operation:

H2=H/(A*H+B);

where H is the transfer function of the original system, A and B are scalar matrix of dimensions 15x15 and H2 is the transfer function that I want to obtain.

I have tried the command:

Hin=A*H+B;

H2=H/Hin;

but I obtain the following message: 'Unable to convert the model to a transfer function because of overflow'

Thanks in advance.

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Answer 1

Jamie 2013-8-5

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编辑：Jamie 2013-8-5

Hi upna,

I note this post is rather old. I trust you've long since resolved the issue. In the off-chance.. in this situation I would usually look to obtain a minimal realisation with a suitable tolerance prior to the manipulation of H

i.e.

> minreal(H,tolerance)

In general, numeric LTI models are not ideal where accuracy is concerned. If poss a ss approach would be preferable

http://www.mathworks.com/help/control/ug/conversion-between-model-types.html