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plzr — pole-zero plot
plzr(sl)
produces a pole-zero plot of the linear system sl (syslin list)
s=poly(0,'s');
n=[1+s   2+3*s+4*s^2        5; 0        1-s             s];
d=[1+3*s   5-s^3           s+1;1+s     1+s+s^2      3*s-1];
h=syslin('c',n./d); 
plzr(h);
 
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