R_demo.ipynb

{
 "metadata": {
  "kernelspec": {
   "codemirror_mode": "R",
   "display_name": "R",
   "language": "R",
   "name": "ir"
  },
  "name": "",
  "signature": "sha256:769b53de9bc90dc3041db26edc113bb1a72abdd9c76947f292e60f3eefa53f70"
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 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Basic operations"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "print(\"Hello world! Love, R in IPython.\")"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "a = 1:78\n",
      "a ^ 2"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Plotting works too:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x = seq(0, 2*pi, length.out=50)\n",
      "plot(x, sin(x))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "No tab completion yet - come and implement it!"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Rich display"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "There is a separate `IRdisplay` package with the display API - it will be possible to use the same function calls with `%%R` magics from the IPython kernel.\n",
      "\n",
      "The plotting example above uses `display_png`."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "library(IRdisplay)\n",
      "\n",
      "display_html('<b>Repo:</b> <a href=\"https://github.com/takluyver/IRkernel/\" target=\"_new\">takluyver/IRkernel</a><hr/>')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "This is already seeing serious use. Here's a notebook by [Ramnath Vaidyanathan](https://github.com/ramnathv/):"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "## Leaflet Routing Machine Plugin\n",
      "\n",
      "I saw the [following issue](https://github.com/ramnathv/rMaps/issues/45) posted to the [rMaps](http://github.com/ramnathv/rMaps) github repo today.\n",
      "\n",
      "> I am new to using rMaps and leaflet. I would like to plot the route between two locations. The leaflet routing machine plugin allows us to do this (https://github.com/perliedman/leaflet-routing-machine). I am not quite sure how to use the functions `addAssets()` and `setTemplate()` to be able to use this plugin.\n",
      "\n",
      "This was a good exercise for me to test whether these newly introduced mechanisms `addAssets` and `setTemplate` would allow one to easily extend the base leaflet binding in [rMaps](http://rmaps.github.io).\n",
      "\n",
      "Let us start by creating the base map."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "library(rMaps)\n",
      "map = Leaflet$new()\n",
      "map$setView(c(40.73846, -73.99413), 16)\n",
      "map$tileLayer(provider = 'Stamen.TonerLite')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "display_chart = function(viz){\n",
      "  y = paste(capture.output(viz$show('iframesrc', cdn = TRUE)), collapse = \"\\n\")\n",
      "  IRdisplay::display_html(y)\n",
      "}"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "display_chart(map)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "We now want to add a route between the following waypoints. I have chosen the data structure to be an unnamed list of vectors, since it converts easily to the JSON structure expected by by routing plugin."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "mywaypoints = list(c(40.74119, -73.9925), c(40.73573, -73.99302))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "In order to use the routing plugin, we first need to add the required js/css assets. I introduced the `addAssets` method in the `dev` version of `rCharts` precisely to serve this need (NOTE: It is currently a little buggy in terms of order in which the assets are specified, but I will take care of that this week)."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "map$addAssets(\n",
      "  css = \"http://www.liedman.net/leaflet-routing-machine/dist/leaflet-routing-machine.css\",\n",
      "  jshead = \"http://www.liedman.net/leaflet-routing-machine/dist/leaflet-routing-machine.min.js\"\n",
      ")\n",
      "\n",
      "routingTemplate = \"\n",
      " <script>\n",
      " var mywaypoints = %s\n",
      " L.Routing.control({\n",
      "  waypoints: [\n",
      "    L.latLng.apply(null, mywaypoints[0]),\n",
      "    L.latLng.apply(null, mywaypoints[1])\n",
      "  ]\n",
      " }).addTo(map);\n",
      " </script>\"\n",
      "\n",
      "map$setTemplate(\n",
      "  afterScript = sprintf(routingTemplate, RJSONIO::toJSON(mywaypoints))\n",
      ")\n",
      "display_chart(map)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "[Original notebook on nbviewer](http://nbviewer.ipython.org/urls/gist.githubusercontent.com/ramnathv/9998388/raw/349d6c6756679610cbb78812911f6b15da56e12f/rmaps_leaflet_routing.ipynb?create=1)"
     ]
    }
   ],
   "metadata": {}
  }
 ]
}