{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Ch1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import importlib\n",
    "from distutils.version import LooseVersion\n",
    "\n",
    "# check that all packages are installed (see requirements.txt file)\n",
    "required_packages = {'jupyter', \n",
    "                     'numpy',\n",
    "                     'matplotlib',\n",
    "                     'ipywidgets',\n",
    "                     'scipy',\n",
    "                     'pandas',\n",
    "                     'numba',\n",
    "                     'multiprocess',\n",
    "                     'SimpleITK'\n",
    "                    }\n",
    "\n",
    "problem_packages = list()\n",
    "# Iterate over the required packages: If the package is not installed\n",
    "# ignore the exception. \n",
    "for package in required_packages:\n",
    "    try:\n",
    "        p = importlib.import_module(package)        \n",
    "    except ImportError:\n",
    "        problem_packages.append(package)\n",
    "    \n",
    "if len(problem_packages) == 0:\n",
    "    print('All is well.')\n",
    "else:\n",
    "    print('The following packages are required but not installed: ' \\\n",
    "          + ', '.join(problem_packages))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import matplotlib.pyplot as plt\n",
    "import SimpleITK as sitk"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "image = sitk.Image(256, 128, 64, sitk.sitkInt16)\n",
    "image_2D = sitk.Image(64, 64, sitk.sitkFloat32)\n",
    "image_2D = sitk.Image([32,32], sitk.sitkUInt32)\n",
    "image_RGB = sitk.Image([128,128], sitk.sitkVectorUInt8, 3)\n",
    "nda = sitk.GetArrayFromImage(image)\n",
    "plt.imshow(nda[:,:,0])"
   ]
  }
 ],
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