num.py

 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Array Indexing"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Question: Get third and fourth elements from the following array and add them.\n",
    "arr = np.array([1, 2, 3, 4, 8,12, 9])\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Extract the last column from the array arr.\n",
    "\n",
    "arr = np.array([[1, 2, 3],\n",
    "                [4, 5, 6],\n",
    "                [7, 8, 9]])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Question: Create a new array new_arr containing elements from the second and third rows of arr.\n",
    "arr = np.array([[1, 2, 3],\n",
    "                [4, 5, 6],\n",
    "                [7, 8, 9]])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Question: Use negative indexing to access 2nd last array from the end.\n",
    "arr = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17])\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Array Slicing"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Question: Given a 1D NumPy array arr, extract elements from index 2 to index 5.\n",
    "arr = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9])\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Question: Extract every alternate element from the array arr.\n",
    "arr = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9])\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Question: Given a 2D NumPy array arr, extract the subarray consisting of rows from index 1 to index 3 and columns from index 2 to index 4.\n",
    "arr = np.array([[1, 2, 3, 4, 5],\n",
    "                [6, 7, 8, 9, 10],\n",
    "                [11, 12, 13, 14, 15],\n",
    "                [16, 17, 18, 19, 20]])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# HAPPY CODING!!"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": []
  }
 ],
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