{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Histogramm example\n",
    "Example's idea taken from https://github.com/rdp/ruby_gnuplot/blob/master/examples/histogram.rb ."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "image/png": 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NYsETUrHWypbpYgWXeUWsUriidO80du4n51jwgEysees9GE2jXboXscpC1o9ltoUMpXsRqyxEYm1H0ylH6V7EKgvuFb5JhFjpINabRIiVDmK9SYRY6SDWm0SIlU6JYv27ExyEWJkpUqwXS38FIVZmECsoEWLFglhBiRArFsQKSoRYsSBWUCLEigWxghIhViyIFZQIsWJBrKBEiBULYgUlQqxYECsoEWLFglhBiRArFsQKSoRYsSBWUCLEigWxghIhViyIFZQIsWJBrKBEiBULYgUlQqxYECsoEWLFglhBiRArFsQKSoRYsSBWUCLEigWxghIhViyIFZQIsWJBrKBEiBULYgUlQqxYECsoEWLFglhBiRArFsQKSoRYsSBWUCLEigWxghIhViyIFZQIsWJBrKBEiBULYgUlQqxYECsoEWLFglhBiRArFmktnS0+a+lexCoAkVimN2t83tK9iFUAslo60xY/miZj6V7EKgDpOdYan7esHGIVwDVipRfCDE6EWGWBWEGJECuWT4uVUroXsb6aK0r3co4FHq4RazRNxtK9iFUA14iVt3QvYhWASKz70TRr6V7EKgDuFQYlQqxYECsoEWLFglhBiRArFsQKSoRYsSBWUCLEigWxghIhViyIFZQIsWJBrKBEiBULYgUlQqxYECsoEWLFglhBiRArFsQKSoRYsSBWUKKyxfrvQK6ciBWUqHCxXi7qglhBiRArFsQKSoRYsSBWUCLEigWxghIhViyIFZQIsWJBrKBEiBULYgUlQqxYECsoEWLFglhBiRArFsQKSoRYsSBWUCLEiuUHxfrfneBEiBXLL4r1YumvRIgVC2IFJapGrH93dHMiVlCiesR6saQCYgUl+vPE7AND6cJBrDd8WqzwoFwHm3AQ6w3liBW8ddlArDcgVjqI9QbEWhOlnMwh1hsQ6zERYl2SHrEeEymLJbzORaygRL8oVkKiA2WL9b/g+36ItZLy2f2iWM2rxVdBnxDrr6ZL4UKxmleLr4IQ603QR8T6Y+tSQKxnFEr31iJW0sdwWEwZCVSNWBqlexHr8eWVxQo/uOcTazTN5aV7axHrX/ANxk+L9T7mQD6xNMrKVSPWy8U/EmUT62D9N4qlUWG1bLHuPZDHROGnS8Htne2zO4BYQYm09wmVbN2BT4sFtZJNrJfnWABSRtM8l+4FkPKydC+AmOFF6V4AAAAA+Bqm0URfBaTE5AuqcOtKZBq6OfYCMyUmX1CFW1coc5cnJl9QhVtXILRc3iC8ujbmy1vuu7euQGi5vEE/4NU0T/v7nLrOxMY0xoT1/mcLqnDriqTrp9v77LuhC7pWucdM/WjGsOubbEEVbl2RdO02QmKwPx8H0f8RM9rPKHCIRbagCreuSG57qdWpOSrGrR06KCxbUIVbVyT2nU7z3Lf2Dcd9ou7DGcJkzBhU4dYViVmHDXb9MI2hu2Ybs+3Jn742+/mgj21dF3LOlJSoUNwfzjiPJuKiyO7cxn75b/nD64I+0VNQ+A2zY6a5H4OiTjFzWMwpKJhzprCz8WPMVPO1YTPbN2e6qGuVddT9PNv/u9Drmz0o5obZPaiZmrAr16SYY1A4h8+ha0zsZzf2Vd83dIOcxyHqWsX0w/LZLLuePuL65hbkCO0oPAUFXrk+xIS5cgpazA9q8PvnYNy/go6Gp8/OVHwKb/rR/aHGXKuYvl/2dOvnGXx9swY5wjugD0FN6AVGSsztLQ3d8mmMfWtiMg1z5/b7gWatn11v/5qbueaj4ZR4rTKbJjpmDUy9sRH79x1xtbslcIpM0WfWg4uIkGQeB2Njav/yQsq1yu0gM0fErAGxXk2D+/jDr1wb947sYScqZp3JJ9YrswbGhKyf3TRHuVgiSRdF2148puVON8yCg5bdiD1A9X1E4HS42o1hMSvSq+1MIG7XM7oUVXdlrRyvpEI7A9Y91RgVc7hBGRW0LwcHuRjTRcVYhn47cwwOWrfOdTIHB40uxxy9dcVxuCgK7gwwrt8+LuZ+wywq6L5a1Na5q93I8cDLWXVk0Jop7nMYEmLK5HQlFXiwWmLuR43QA9ypY0kzaLna7fdjTfDhdzkODrd1g/tE2vl+DhG8dfExxRP+Pu/NHR5zkEQ5aEqIMWZfjEg0ZNq6stEeGWlSgvYeS0aVlgotlzfoB7xK6QxI60DIFVTh1hXJsTNAMyZfUIVbVySHzgDVmHxBFW5dkaxXX1PUn1FKTL6gCreuSNZ3Okf1WKfE5AuqcOuKxLjH2f0hBfdyJ8TkC6pw68qHq/u8QT9yLk/LZQ7Cq2tjvrzlvnvrCoSWyxv0A14xJ0cBW1ckzMlRwNYVCXNyFLB1RcKcHAVsXZEwJ0cBW1ckpqQ5ObIlCvyOtHzr5nrPs5Jm/8g2+UfS7B/ZJv9Imv3jtHWBc0GUScrsH9km/5DOGBJOyuQfSbN/nLauZrNSZv/INvlH0uwf2Sb/SJr94+EdVW1W/Owf2Sb/EMwYkmHyj6TZP87vqGazHKmzf2Sb/CN69o9sk38kz/4xdXMbdSZYIKmzf2SZ/CNt9o9ck3+kzv4xzOt+rm7iZ//IN/lH6uwfmSb/SJv9YzndN3ERZXKY/SO01+H0/ZPQnorThV3w5KaH2T/Cg+6Tf0QmWif/CA8aXZI5KtNw+MuKeEflcZ/9I7zX4f79k4ieirtZEUH32T9iZkS9Tf4RnSjuYzjM/hHx2e07xah3VCC32T9ieh1ukkTNU5oUdJv9Iypom/wjLtE2+Ufk1iUE7RtZ+x3pdfaPuF6H7ZtNcfOUJgWt82tE9olsK0clWif/yLB1W2BCTJFE9jqYhJj1VlxS90ZKULZE+bauQFJ6HZJ6KrIFVbh1JZIw52hSTL6gCreuRI69Dpox+YIq3LoSOcw5qhqTL6jCrSuS05yjijH5gircujJJ6apL6t7LFlTh1gEAAAAAAAAAAAAAAAAAAAAAAEAK/wcMcOc13h/FPAAAAABJRU5ErkJggg==",
      "text/plain": [
       "#<File:./histogramm.png>"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "require 'pilot-gnuplot'\n",
    "include Gnuplot\n",
    "\n",
    "titles = %w{decade Austria Hungary  Belgium}\n",
    "\n",
    "data = [\n",
    "    ['1891-1900',  234081,  181288,  18167],\n",
    "    ['1901-1910',  668209,  808511,  41635],\n",
    "    ['1911-1920',  453649,  442693,  33746],\n",
    "    ['1921-1930',  32868,   30680,   15846],\n",
    "    ['1931-1940',  3563,    7861,    4817],\n",
    "    ['1941-1950',  24860,   3469,    12189],\n",
    "    ['1951-1960',  67106,   36637,   18575],\n",
    "    ['1961-1970',  20621,   5401,    9192],\n",
    "]\n",
    "\n",
    "x = data.map(&:first)\n",
    "datasets = (1..3).map do |col|\n",
    "  y = data.map { |row| row[col] }\n",
    "  Dataset.new([x, y], using: '2:xtic(1)', title: titles[col], file: true)\n",
    "end\n",
    "\n",
    "histogramm = Plot.new(\n",
    "  *datasets,\n",
    "  title: 'Histogram example',\n",
    "  style: 'data histograms',\n",
    "  xtics: 'nomirror rotate by -45'\n",
    ")\n",
    "\n",
    "histogramm.to_png('./histogramm.png', size: [600, 600])\n",
    "File.open('./histogramm.png')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The same data may be also plotted in another form."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "image/png": 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",
      "text/plain": [
       "#<File:./linespoints.png>"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "linespoints = histogramm.style('data linespoints')\n",
    "linespoints.to_png('./linespoints.png', size: [600, 600])\n",
    "File.open('./linespoints.png')"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Ruby 2.1.2",
   "language": "ruby",
   "name": "ruby"
  },
  "language_info": {
   "file_extension": "rb",
   "mimetype": "application/x-ruby",
   "name": "ruby",
   "version": "2.1.2"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}