Numpy Indexing and Slicing.ipynb

numpy-indexing-and-slicing.ipynb

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  "metadata": {
    "colab": {
      "name": "Numpy Indexing and Slicing.ipynb",
      "provenance": [],
      "authorship_tag": "ABX9TyOA50+IyBTaV2fNk5ZtNBBa",
      "include_colab_link": true
    },
    "kernelspec": {
      "name": "python3",
      "display_name": "Python 3"
    }
  },
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "view-in-github",
        "colab_type": "text"
      },
      "source": [
        "<a href=\"https://colab.research.google.com/gist/HarshCasper/bb46189963a10e2462465a622d5ba31c/numpy-indexing-and-slicing.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "VqIG3FOxVopu",
        "colab_type": "text"
      },
      "source": [
        "# Numpy Indexing and Slicing"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "EpmfrVqKVq8d",
        "colab_type": "code",
        "outputId": "5b3fb9ac-f97d-4fcc-b0d1-c2beec7ef7d9",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "import numpy as np\n",
        "list1=[1,2,3,4,5]\n",
        "arr=np.array(list1)\n",
        "print(arr)"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[1 2 3 4 5]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "aitVzzPxVso4",
        "colab_type": "code",
        "outputId": "71218b13-c492-4f41-d0e6-586d1c044832",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 50
        }
      },
      "source": [
        "# Accessing the Array Elements\n",
        "\n",
        "print(\"The First Element of the Array is %r\" %(arr[0]))\n",
        "print(\"The Fifth Element of the Array is %r\" %(arr[4]))"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "The First Element of the Array is 1\n",
            "The Fifth Element of the Array is 5\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "bvq0c3olXpsP",
        "colab_type": "code",
        "outputId": "04bd6854-479d-460a-df88-037f1bf08d7e",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 50
        }
      },
      "source": [
        "arr=np.array([[1,2,4],[5,6,7]])\n",
        "arr"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[1, 2, 4],\n",
              "       [5, 6, 7]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 5
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "E35dpeLhYAId",
        "colab_type": "code",
        "outputId": "565e29ca-4f3c-4d56-99af-d3ea52230ffd",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "# Get a Specific Row\n",
        "print(arr[0,:])"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[1 2 4]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "XE-uEaNjYefN",
        "colab_type": "code",
        "outputId": "2f246cb3-9009-44a9-b7e2-8cfaed503032",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "# Get a Specific Column\n",
        "print(arr[:,2])"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[4 7]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "XeK13EoOYrrs",
        "colab_type": "code",
        "outputId": "c40450d9-a6a0-404c-908f-d70dc7782483",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "# Getting a Particular Element\n",
        "print(\"The Element at the Second Row and Third Column is %r\" %(arr[1,2]))"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "The Element at the Second Row and Third Column is 7\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "qSFVb1p3Zl7O",
        "colab_type": "code",
        "outputId": "92841212-9c5e-4a3a-d4bc-8ca1d10a019d",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 84
        }
      },
      "source": [
        "# Declaring a Three-Dimensional Matrix and Accessing-Indexing Elements\n",
        "\n",
        "arr=np.array([[1,2,3],[4,5,6],[7,8,9]])\n",
        "print(arr)\n",
        "print(\"The Element present at the index where two diagonals intersect is %r\" %(arr[1,1]))"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[1 2 3]\n",
            " [4 5 6]\n",
            " [7 8 9]]\n",
            "The Element present at the index where two diagonals intersect is 5\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "RtjAKZDfaknV",
        "colab_type": "code",
        "outputId": "d04951db-2699-46cd-88ce-2f5e917a867f",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 50
        }
      },
      "source": [
        "print(arr[0:2,1:3])"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[2 3]\n",
            " [5 6]]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "De8FuE8Ra_bI",
        "colab_type": "code",
        "outputId": "5d09d005-6651-4377-8724-3f57a1ddded7",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "print(arr[0:2,2])"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[3 6]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "XKE7ngT3cEg9",
        "colab_type": "code",
        "outputId": "c470081d-4495-4390-f0d9-6183ee3016d6",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 50
        }
      },
      "source": [
        "print(arr[1:3,0:])"
      ],
      "execution_count": 0,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[4 5 6]\n",
            " [7 8 9]]\n"
          ],
          "name": "stdout"
        }
      ]
    }
  ]
}