{ "cells": [ { "cell_type": "code", "execution_count": 4, "metadata": { "collapsed": true }, "outputs": [], "source": [ "import math\n", "import sympy\n", "from sympy import latex\n", "from IPython.display import HTML, display\n", "\n", "%matplotlib notebook\n", "\n", "sympy.init_printing()" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "# OMA 2. kolokvij 2013/2014" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## 1. naloga" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "*Podana je funkcija $f(x)=x^2 e^{-x}$.*" ] }, { "cell_type": "code", "execution_count": 5, "metadata": { "collapsed": true }, "outputs": [], "source": [ "x = sympy.symbols('x')\n", "f = lambda x: x**2 * sympy.E**(-x)" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "*Doloci definicijsko obmocje ${\\cal D}_f$ in izracunaj limiti v robovih ${\\cal D}_f$.*" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "Ker je eksponentna funkcija definirana povsod, je ${\\cal D}_f = \\mathbb{R}$. \n", "$\\displaystyle{\\lim_{x\\to\\infty} x^2 e^{-x} = 0}.$ \n", "$\\displaystyle{\\lim_{x\\to -\\infty} x^2 e^{-x} = \\infty}.$" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "*Poisci nicle in stacionarne tocke funkcije $f$.*" ] }, { "cell_type": "code", "execution_count": 6, "metadata": { "collapsed": false }, "outputs": [ { "data": { "image/png": "iVBORw0KGgoAAAANSUhEUgAAAFsAAAAUBAMAAAAQFlwTAAAAMFBMVEX///8AAAAAAAAAAAAAAAAA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\n", "text/latex": [ "$$x^{2} e^{- x} = 0$$" ], "text/plain": [ " 2 -x \n", "x ⋅ℯ = 0" ] }, "execution_count": 6, "metadata": {}, "output_type": "execute_result" } ], "source": [ "equation = sympy.Eq(f(x), 0)\n", "equation" ] }, { "cell_type": "code", "execution_count": 7, "metadata": { "collapsed": false }, "outputs": [ { "data": { "text/html": [ "Nicle: $\\left [ 0\\right ]$" ], "text/plain": [ "" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "solutions = sympy.solve(equation)\n", "s = 'Nicle: ${0}$'.format(latex(solutions))\n", "display(HTML(s))" ] }, { "cell_type": "code", "execution_count": 8, "metadata": { "collapsed": false }, "outputs": [ { "data": { "image/png": "iVBORw0KGgoAAAANSUhEUgAAALwAAAAWBAMAAACI4OsQAAAAMFBMVEX///8AAAAAAAAAAAAAAAAA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\nAAAAAElFTkSuQmCC\n", "text/latex": [ "$$- x^{2} e^{- x} + 2 x e^{- x} = 0$$" ], "text/plain": [ " 2 -x -x \n", "- x ⋅ℯ + 2⋅x⋅ℯ = 0" ] }, "execution_count": 8, "metadata": {}, "output_type": "execute_result" } ], "source": [ "derivative = sympy.diff(f(x), x)\n", "equation = sympy.Eq(derivative, 0)\n", "equation" ] }, { "cell_type": "code", "execution_count": 9, "metadata": { "collapsed": false }, "outputs": [ { "data": { "text/html": [ "Stacionarne tocke: $\\left [ 0, \\quad 2\\right ]$" ], "text/plain": [ "" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "solutions = sympy.solve(equation)\n", "s = 'Stacionarne tocke: ${0}$'.format(latex(solutions))\n", "display(HTML(s))" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "*Narisi graf funkcije $f$.* " ] }, { "cell_type": "code", "execution_count": 10, "metadata": { "collapsed": false }, "outputs": [ { "data": { "application/javascript": [ "/* Put everything inside the global mpl namespace */\n", "window.mpl = {};\n", "\n", "mpl.get_websocket_type = function() {\n", " if (typeof(WebSocket) !== 'undefined') {\n", " return WebSocket;\n", " } else if (typeof(MozWebSocket) !== 'undefined') {\n", " return MozWebSocket;\n", " } else {\n", " alert('Your browser does not have WebSocket support.' +\n", " 'Please try Chrome, Safari or Firefox ≥ 6. ' +\n", " 'Firefox 4 and 5 are also supported but you ' +\n", " 'have to enable WebSockets in about:config.');\n", " };\n", "}\n", "\n", "mpl.figure = function(figure_id, websocket, ondownload, parent_element) {\n", " this.id = figure_id;\n", "\n", " this.ws = websocket;\n", "\n", " this.supports_binary = (this.ws.binaryType != undefined);\n", "\n", " if (!this.supports_binary) {\n", " var warnings = document.getElementById(\"mpl-warnings\");\n", " if (warnings) {\n", " warnings.style.display = 'block';\n", " warnings.textContent = (\n", " \"This browser does not support binary websocket messages. \" +\n", " \"Performance may be slow.\");\n", " }\n", " }\n", "\n", " this.imageObj = new Image();\n", "\n", " this.context = undefined;\n", " this.message = undefined;\n", " this.canvas = undefined;\n", " this.rubberband_canvas = undefined;\n", " this.rubberband_context = undefined;\n", " this.format_dropdown = undefined;\n", "\n", " this.image_mode = 'full';\n", "\n", " this.root = $('
');\n", " this._root_extra_style(this.root)\n", " this.root.attr('style', 'display: inline-block');\n", "\n", " $(parent_element).append(this.root);\n", "\n", " this._init_header(this);\n", " this._init_canvas(this);\n", " this._init_toolbar(this);\n", "\n", " var fig = this;\n", "\n", " this.waiting = false;\n", "\n", " this.ws.onopen = function () {\n", " fig.send_message(\"supports_binary\", {value: fig.supports_binary});\n", " fig.send_message(\"send_image_mode\", {});\n", " fig.send_message(\"refresh\", {});\n", " }\n", "\n", " this.imageObj.onload = function() {\n", " if (fig.image_mode == 'full') {\n", " // Full images could contain transparency (where diff images\n", " // almost always do), so we need to clear the canvas so that\n", " // there is no ghosting.\n", " fig.context.clearRect(0, 0, fig.canvas.width, fig.canvas.height);\n", " }\n", " fig.context.drawImage(fig.imageObj, 0, 0);\n", " };\n", "\n", " this.imageObj.onunload = function() {\n", " this.ws.close();\n", " }\n", "\n", " this.ws.onmessage = this._make_on_message_function(this);\n", "\n", " this.ondownload = ondownload;\n", "}\n", "\n", "mpl.figure.prototype._init_header = function() {\n", " var titlebar = $(\n", " '
');\n", " var titletext = $(\n", " '
');\n", " titlebar.append(titletext)\n", " this.root.append(titlebar);\n", " this.header = titletext[0];\n", "}\n", "\n", "\n", "\n", "mpl.figure.prototype._canvas_extra_style = function(canvas_div) {\n", "\n", "}\n", "\n", "\n", "mpl.figure.prototype._root_extra_style = function(canvas_div) {\n", "\n", "}\n", "\n", "mpl.figure.prototype._init_canvas = function() {\n", " var fig = this;\n", "\n", " var canvas_div = $('
');\n", "\n", " canvas_div.attr('style', 'position: relative; clear: both; outline: 0');\n", "\n", " function canvas_keyboard_event(event) {\n", " return fig.key_event(event, event['data']);\n", " }\n", "\n", " canvas_div.keydown('key_press', canvas_keyboard_event);\n", " canvas_div.keyup('key_release', canvas_keyboard_event);\n", " this.canvas_div = canvas_div\n", " this._canvas_extra_style(canvas_div)\n", " this.root.append(canvas_div);\n", "\n", " var canvas = $('');\n", " canvas.addClass('mpl-canvas');\n", " canvas.attr('style', \"left: 0; top: 0; z-index: 0; outline: 0\")\n", "\n", " this.canvas = canvas[0];\n", " this.context = canvas[0].getContext(\"2d\");\n", "\n", " var rubberband = $('');\n", " rubberband.attr('style', \"position: absolute; left: 0; top: 0; z-index: 1;\")\n", "\n", " var pass_mouse_events = true;\n", "\n", " canvas_div.resizable({\n", " start: function(event, ui) {\n", " pass_mouse_events = false;\n", " },\n", " resize: function(event, ui) {\n", " fig.request_resize(ui.size.width, ui.size.height);\n", " },\n", " stop: function(event, ui) {\n", " pass_mouse_events = true;\n", " fig.request_resize(ui.size.width, ui.size.height);\n", " },\n", " });\n", "\n", " function mouse_event_fn(event) {\n", " if (pass_mouse_events)\n", " return fig.mouse_event(event, event['data']);\n", " }\n", "\n", " rubberband.mousedown('button_press', mouse_event_fn);\n", " rubberband.mouseup('button_release', mouse_event_fn);\n", " // Throttle sequential mouse events to 1 every 20ms.\n", " rubberband.mousemove('motion_notify', mouse_event_fn);\n", "\n", " rubberband.mouseenter('figure_enter', mouse_event_fn);\n", " rubberband.mouseleave('figure_leave', mouse_event_fn);\n", "\n", " canvas_div.on(\"wheel\", function (event) {\n", " event = event.originalEvent;\n", " event['data'] = 'scroll'\n", " if (event.deltaY < 0) {\n", " event.step = 1;\n", " } else {\n", " event.step = -1;\n", " }\n", " mouse_event_fn(event);\n", " });\n", "\n", " canvas_div.append(canvas);\n", " canvas_div.append(rubberband);\n", "\n", " this.rubberband = rubberband;\n", " this.rubberband_canvas = rubberband[0];\n", " this.rubberband_context = rubberband[0].getContext(\"2d\");\n", " this.rubberband_context.strokeStyle = \"#000000\";\n", "\n", " this._resize_canvas = function(width, height) {\n", " // Keep the size of the canvas, canvas container, and rubber band\n", " // canvas in synch.\n", " canvas_div.css('width', width)\n", " canvas_div.css('height', height)\n", "\n", " canvas.attr('width', width);\n", " canvas.attr('height', height);\n", "\n", " rubberband.attr('width', width);\n", " rubberband.attr('height', height);\n", " }\n", "\n", " // Set the figure to an initial 600x600px, this will subsequently be updated\n", " // upon first draw.\n", " this._resize_canvas(600, 600);\n", "\n", " // Disable right mouse context menu.\n", " $(this.rubberband_canvas).bind(\"contextmenu\",function(e){\n", " return false;\n", " });\n", "\n", " function set_focus () {\n", " canvas.focus();\n", " canvas_div.focus();\n", " }\n", "\n", " window.setTimeout(set_focus, 100);\n", "}\n", "\n", "mpl.figure.prototype._init_toolbar = function() {\n", " var fig = this;\n", "\n", " var nav_element = $('
')\n", " nav_element.attr('style', 'width: 100%');\n", " this.root.append(nav_element);\n", "\n", " // Define a callback function for later on.\n", " function toolbar_event(event) {\n", " return fig.toolbar_button_onclick(event['data']);\n", " }\n", " function toolbar_mouse_event(event) {\n", " return fig.toolbar_button_onmouseover(event['data']);\n", " }\n", "\n", " for(var toolbar_ind in mpl.toolbar_items) {\n", " var name = mpl.toolbar_items[toolbar_ind][0];\n", " var tooltip = mpl.toolbar_items[toolbar_ind][1];\n", " var image = mpl.toolbar_items[toolbar_ind][2];\n", " var method_name = mpl.toolbar_items[toolbar_ind][3];\n", "\n", " if (!name) {\n", " // put a spacer in here.\n", " continue;\n", " }\n", " var button = $('