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+// Value of polynomial p(x), evaluated at x
+// 11.16
+
+// finds the value of a polynomial in powers of z^{-1}
+// function Y = filtval(P,z)
+
+function Y = filtval(P,z)
+N = length(P)-1;
+Q = polyno(P,'x');
+Y = horner(Q,z)/z^N;
+endfunction;