Update kernel installation

Author: Carreau

examples/Notebook/Multiple Languages, Frontends.ipynb

@@ -96,6 +96,105 @@
     "about the notebook document: it just gets sent cells of code to execute when the\n",
     "user runs them."
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Install more languages\n",
+    "\n",
+    "The exact procedure to install a kernel for a different language will depend on the specificity of each language. \n",
+    "Though ther is a common set of step to follow.\n",
+    "\n",
+    "  - Install the language stack you are interested in.\n",
+    "  - Install the kernel for this language (often using given language package manager).\n",
+    "  - Register the kernel globally with Jupyter. \n",
+    "  \n",
+    "While usually a kernel is though as a specific language, a kernel may be:\n",
+    "\n",
+    "  - A virtual environment (or equivalent)\n",
+    "  - A set of configuration/environment variables.\n",
+    "  - A physical location (for remote kernels)\n",
+    "  \n",
+    "Installing multiple kernels does not automatically allow one notebook to use many languages at once, but this is also possible.\n",
+    "\n",
+    "A community maintained list of available kernel can be found on the [Jupyter Wiki](https://github.com/jupyter/jupyter/wiki/Jupyter-kernels). "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Install a second python kernel\n",
+    "\n",
+    "\n",
+    "Using conda:\n",
+    "\n",
+    "\n",
+    "```\n",
+    "$ conda create -n pycon-env python=3.6 --yes --quiet\n",
+    "$ source activate pycon-env\n",
+    "(pycon-env)$ conda install ipykernel --yes\n",
+    "(pycon-env)$ python -m ipykernel install --name pycon-kernel\n",
+    "Installed kernelspec pycon-kernel in /usr/local/share/jupyter/kernels/pycon-kernel\n",
+    "```\n",
+    "\n",
+    "Available options are  `--user`, `--name <machine-readable-name>`, `--display-name <\"User Friendly Name\">`"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Install and R kernel\n",
+    "\n",
+    "\n",
+    "Again using conda, let's install the R stack and create an R kernel.\n",
+    "\n",
+    "In a shell:\n",
+    "```\n",
+    "$ conda install -c r r # install r form teh R channel\n",
+    "$ conda install -c r r-irkernel\n",
+    "$ r\n",
+    "> IRkernel::installspec()\n",
+    "```\n",
+    "\n",
+    "If you are not using conda you may need to replace by :\n",
+    "\n",
+    "```\n",
+    "$ R\n",
+    "> install.packages(c('repr', 'IRdisplay', 'evaluate', 'crayon', 'pbdZMQ', 'devtools', 'uuid', 'digest'))\n",
+    "...\n",
+    "> devtools::install_github('IRkernel/IRkernel')\n",
+    "```\n",
+    "\n",
+    "You may want to install Rin the **same** environment as the previous Python Kernel if you wish to do R **and** python inthe same notebook. "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### install more kernels\n",
+    "\n",
+    "Feel fre to experiment with other kernel, poke at the installed kernelspec folders. Use the following to list all the kernels and their locations:\n",
+    "\n",
+    "```\n",
+    "$ jupyter kernelspec list\n",
+    "Available kernels:\n",
+    "  ir           /home/jovyan/.local/share/jupyter/kernels/ir\n",
+    "  julia-0.5    /opt/conda/share/jupyter/kernels/julia-0.5\n",
+    "  python3      /opt/conda/share/jupyter/kernels/python3\n",
+    "  python2      /usr/local/share/jupyter/kernels/python2\n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "The above process can take a long time, need to compile a few modules. You may want to try the `jupyter/datascience-notebook` Docker image which already have Python, Julia and R installed. Warning the Docker image is big (several GB) ! Please don't try to download it on Conference wifi. "
+   ]
   }
  ],
  "metadata": {
@@ -114,9 +213,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.4.3"
+   "version": "3.6.0"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 0
+ "nbformat_minor": 1
 }