How can I round off the coefficients of sys2 polynomial(num/den)?

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sadel
sadel 2011-6-23
num=[1 0 0];
den=[1 0 0 1];
sys=tf(num,den)
sysd=c2d(sys,0.3)
sys2=d2c(sysd)
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Walter Roberson
Walter Roberson 2011-6-23
For background, see http://www.mathworks.com/matlabcentral/answers/10096-i-m-trying-to-convert-a-system-from-c2d-and-then-from-d2c-but-the-results-are-not-the-same-why-the

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Paulo Silva
Paulo Silva 2011-6-23
Hi sadel, I see another hard question :)
num=[1 0 0];
den=[1 0 0 1];
sys=tf(num,den);
sysd=c2d(sys,0.3);
sys2=d2c(sysd);
[num,den] = tfdata(sys2);
num=round(num{:});
den=round(den{:});
sys2simple=tf(num,den)
Be carefull, in your example this code works well enough but please read the documentation about the round function!!!!!
Also take a look at round2
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sadel
sadel 2011-6-24
Ok I think now it's better, isn't it?
num=[1.5 0 0];
den=[1 0 2.3346 1];
sys=tf(num,den)
sysd=c2d(sys,0.3);
sys2=d2c(sysd);
[num,den] = tfdata(sys2);
num=round(num{:}/0.0001)*0.0001;
den=round(den{:}/0.0001)*0.0001;
sys2simple=tf(num,den)

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