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<div class="moz-cite-prefix">Le 25/02/2017 à 19:17, Pablo Fonovich a
écrit :<br>
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<p>Hi:</p>
<p>This is the first time i work with discrete time transfers
functions and Scilab.</p>
<p>I want to use bode() for plotting the magnitud and phase
response of the system, however, i don't understand how to set
the frequencies to normalized values (-pi, pi).</p>
<p>This is what i'm doing:</p>
<p><br>
</p>
<div>s=poly(0,'s')<br>
H=(s^(-2400))/(1-0.5*s^(-2400))<br>
S=syslin('d',H)<br>
bode(S)</div>
<p><br>
</p>
<p>i get a warning that frequencies beyond nyquist rate are
ignored and the resulting plot is attached.</p>
<p><img tabindex="0" aria-expanded="false"
crossorigin="anonymous" id="img472992" style="max-width:
99.9%;" contenttype="image/png" size="0"
src="cid:part1.AF505552.9295B9D5@inria.fr"><br>
</p>
<p>In the help, it says that bode parameter could include fmin
and fmax in herz, but isn't a discrete system response limited
to normalized frequencies? And to transform the normalized
frecuency to herz the sample rate must be used, but i don't
know how to pass it to the system or something.</p>
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S=syslin(dt,H) defines a dynamical system sampled. dt beeing the
sampling period in second.<br>
If you want the frequency uniis be in rd/s add "rad" as last input
argument<br>
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<p>Any hints would be appreciated.</p>
<p>Thanks<br>
</p>
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