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 "metadata": {
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  "signature": "sha256:6be143f5b287efce533e8ec1df41063cc3b1d0cfa86e26ccea2e09ea05aa46f1"
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 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "# Creating Numpy Arrays\n",
      "\n",
      "- **Author:** [Chris Albon](http://www.chrisalbon.com/), [@ChrisAlbon](https://twitter.com/chrisalbon)\n",
      "- **Date:** -\n",
      "- **Repo:** [Python 3 code snippets for data science](https://github.com/chrisalbon/code_py)\n",
      "- **Note:**"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Import Modules"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import numpy as np"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 3
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Create a list"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentSize = [534, 5468, 6546, 542, 9856, 4125]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 4
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Create a ndarray from the regimentSize list"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentSizeArray = np.array(regimentSize); regimentSizeArray"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 7,
       "text": [
        "array([ 534, 5468, 6546,  542, 9856, 4125])"
       ]
      }
     ],
     "prompt_number": 7
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### What are the number of dimensions of the array?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentSizeArray.ndim"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 19,
       "text": [
        "1"
       ]
      }
     ],
     "prompt_number": 19
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### What is the shape of the array?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentSizeArray.shape"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 9,
       "text": [
        "(6,)"
       ]
      }
     ],
     "prompt_number": 9
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "## Nested Lists To Multidimensional Arrays"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### Create two lists"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentSizePreWar = [534, 5468, 6546, 542, 9856, 4125]\n",
      "regimentSizePostWar = [234, 255, 267, 732, 235, 723]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 13
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "## Create a ndarray from a nested list"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentSizePrePostArray = np.array([regimentSizePreWar, regimentSizePostWar]); regimentSizePrePostArray"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 16,
       "text": [
        "array([[ 534, 5468, 6546,  542, 9856, 4125],\n",
        "       [ 234,  255,  267,  732,  235,  723]])"
       ]
      }
     ],
     "prompt_number": 16
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### What are the number of dimensions of the array?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentSizePrePostArray.ndim"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 17,
       "text": [
        "2"
       ]
      }
     ],
     "prompt_number": 17
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### What is the shape of the array?"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "regimentSizePrePostArray.shape"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 18,
       "text": [
        "(2, 6)"
       ]
      }
     ],
     "prompt_number": 18
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}