Remove small numbers from transfer function

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Jason Gauthier
Jason Gauthier 2020-4-9
评论： Ameer Hamza 2020-4-10
Greetings,
Is there a simple way to remove small numbes from a transfer function?
-0.8921
-------------------------
s^2 + 1.035 s - 1.533e-14
The last term is so incredible small, it's pointless. I have a very set of TFs (12 outputs and 4 inputs.) I'd just like to sweep through and easily clean them up.

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Ameer Hamza
Ameer Hamza 2020-4-10
try this
sys(1) = tf(1, [1 2 1.2e-12]);
sys(2) = tf(1, [2 3 1.5e-11]);
sys(3) = tf(1, [3 4 5.5e-13]);
sys(4) = tf(1, [4 5 2.7e-12]);
[n,d] = tfdata(sys);
n = cellfun(@(x) {x.*(x>1e-7)}, n);
d = cellfun(@(x) {x.*(x>1e-7)}, d);
sys = tf(n, d);
It filters all coefficient with magnitude less than .
  2 个评论
Jason Gauthier
Jason Gauthier 2020-4-10
Thank you! I had to use
n = cellfun(@(x) {x.*(abs(x)>1e-7)}, n);
d = cellfun(@(x) {x.*(abs(x)>1e-7)}, d);
Since some of the coefficients were negative, but this worked great!
Ameer Hamza
Ameer Hamza 2020-4-10
Glad to be of help. On a side note, negative coefficients in a transfer function indicate instability. But if these values are just noise, then it should be fine to ignore it.

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