z^(-1/2) half cycle delay in discrete time

[Dean Parsons]

Hello,

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:

-->z=poly(0,"z");
 
-->a = z^(-0.5);
             !--error 30 
Invalid exponent.

Is there a work around for this? Is there another way to create the discrete time delay z^(-1/2)?

Thank you for your help with this.

Dean Parsons
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