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z^-1 is the value of the system 1 sampling period in the past. But
as sampling is discrete, does it make sense to reference a value
that is between 2 samples, but that does not exist in your model,
since, by definition, it is not sampled ?<br>
<br>
<br>
Le 09/05/2011 19:27, Dean Parsons a écrit :
<blockquote cite="mid:B15769F3038F4849825875D5149C8ADD@optiplex745"
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<div><strong><font size="4">Hello,</font></strong></div>
<div><strong></strong> </div>
<div><strong><font size="4">I want to add a half cycle delay to a
discrete time transfer function by multiplying the transfer
function by z^(-0.5). It seems Scilab doesn't allow
non-integer exponents with the discrete time variable z:</font></strong></div>
<div><strong></strong> </div>
<div><strong><font size="4">-->z=poly(0,"z");<br>
<br>
-->a = z^(-0.5);<br>
!--error 30 <br>
Invalid exponent.<br>
</font></strong></div>
<div><strong><font size="4">Is there a work around for this? Is
there another way to create the discrete time delay
z^(-1/2)?</font></strong></div>
<div><strong></strong> </div>
<div><strong><font size="4">Thank you for your help with this.</font></strong></div>
<div><strong></strong> </div>
<div><strong><font size="4">Dean Parsons</font></strong></div>
<strong></strong></blockquote>
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