Symbolic equations changing when using negative powers

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Isaac Kambouris 2021-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/1576163-symbolic-equations-changing-when-using-negative-powers

评论： Paul 2021-11-1

I am trying to do symbolic calculation to develop a transfer function however i keep on finding that when I do these operations matlab rounds the makes the fraction change to very large whole numbers

A = 0.0273;
S = sym('S'l,'real');
frac = 4.23/(A*S)

I am trying to get 4/(0.0273S) however when matlab run the code its output is 42500/(273*S). I understnd that this is an equivilant fraction but for the purpose of making the transfer function this causes some issues.

Thank you in advance for the help

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Isaac Kambouris 2021-11-1

I am wanting the output to be as as the fraction is written instead of being changed into the whole number form. I am sorry i am not really sure how to explain it. When developing the transfer function this will greatly effect the size of the poles and zeros and effecting the output.

Paul 2021-11-1

It should have no effect whatsoever on the location of the poles and zeros (if that's what "size" means), only on how coefficients of the numerator and denominator are displayed. Are you only concerned about the display? Is there a simple example that illustrates the issue?

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