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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 2: 2D Signals and Systems"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.12: Frequency_Response.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Caption: Frequency Response\n",
+"//Fig2.12\n",
+"//page 60\n",
+"clc;\n",
+"close;\n",
+"[X, Y] = meshgrid(-%pi:.09:%pi);\n",
+"Z = 2*cos(X)+2*cos(Y);\n",
+"surf(X,Y,Z);\n",
+"xgrid(1)"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.16: Frequency_Response.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Caption: Frequency Response\n",
+"//Fig2.16\n",
+"//page 64\n",
+"clc;\n",
+"close;\n",
+"[X, Y] = meshgrid(-%pi:.05:%pi);\n",
+"Z = 2-cos(X)-cos(Y);\n",
+"surf(X,Y,Z);\n",
+"xgrid(1)"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}