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diff --git a/macros/zp2tf.sci b/macros/zp2tf.sci
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+function [num, den] = zp2tf (z, p, k)
+//Converts zeros / poles to a transfer function.
+//Calling Sequence
+//[num, den] = zp2tf (z, p, k)
+//num = zp2tf (z, p, k)
+//Parameters 
+//z: Zeros
+//p: Poles
+//k: Leading coefficient
+//Num: Numerator of the transfer function
+//den: Denomenator of the transfer function
+//Description
+//This is an Octave function.
+//It converts zeros / poles to a transfer function.
+//Examples
+//z = [1 2 3]
+// p = [4 5 6]
+//k = 5
+//[num, den] = zp2tf (z, p, k)
+//num =
+//
+//    5  -30   55  -30
+//
+//den =
+//
+//     1   -15    74  -120
+
+funcprot(0);
+lhs = argn(1)
+rhs = argn(2)
+if (rhs < 3 | rhs > 3)
+error("Wrong number of input arguments.")
+end
+
+select(rhs)
+	
+	case 3 then
+		if(lhs==1)
+		num = callOctave("zp2tf", z, p, k)
+		elseif(lhs==2)
+		[num, den] = callOctave("zp2tf", z, p, k)
+		else
+		error("Wrong number of output argments.")
+		end
+	end
+endfunction