Add octavemagic example notebook.

docs/examples/notebooks/octavemagic_extension.ipynb

@@ -0,0 +1,110
+{
+ "metadata": {
+  "name": "octavemagic_extension"
+ },
+ "nbformat": 3,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "code",
+     "input": [
+      "%load_ext octavemagic"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "input": [
+      "x = %octave [1 2; 3 4];",
+      "x"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "input": [
+      "a = [1, 2, 3]",
+      "",
+      "%octave_push a",
+      "%octave a = a * 2;",
+      "%octave_pull a",
+      "a"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "input": [
+      "%%octave -i x -o y",
+      "y = x + 3;"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "input": [
+      "y"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "input": [
+      "%%octave -f svg",
+      "",
+      "p = [12 -2.5 -8 -0.1 8];",
+      "x = 0:0.01:1;",
+      "",
+      "polyout(p, 'x')",
+      "plot(x, polyval(p, x));"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "input": [
+      "%%octave -s 500,500",
+      "",
+      "# butterworth filter, order 2, cutoff pi/2 radians",
+      "b = [0.292893218813452  0.585786437626905  0.292893218813452];",
+      "a = [1  0  0.171572875253810];",
+      "freqz(b, a, 32);"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "input": [
+      "%%octave -s 600,200 -f png",
+      "",
+      "subplot(121);",
+      "[x, y] = meshgrid(0:0.1:3);",
+      "r = sin(x - 0.5).^2 + cos(y - 0.5).^2;",
+      "surf(x, y, r);",
+      "",
+      "subplot(122);",
+      "sombrero()"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "input": [
+      ""
+     ],
+     "language": "python",
+     "outputs": []
+    }
+   ]
+  }
+ ]
+}
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