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lessons/lesson06/splane.m

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+% `splane` creates a pole-zero plot using pole and zero inputs with the
+% real and imaginary axes superimposed
+function splane(z,p)
+    x1 = real(z);
+    x2 = real(p);
+    y1 = imag(z);
+    y2 = imag(p);
+
+    plot(x1, y1, 'o', x2, y2, 'x');
+    xlabel('Real Part');
+    ylabel('Imaginary Part');
+    axis('equal');
+    line([0 0], ylim(), 'LineStyle', ':');
+    line(xlim(), [0 0], 'LineStyle', ':');
+end
+