1 Objective Questions |
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2 ------------------- |
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3 |
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4 .. A mininum of 8 questions here (along with answers) |
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5 |
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6 1. An array in Python is the same as a Python list |
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7 |
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8 a. True |
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9 #. False |
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10 |
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11 Answer: False |
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12 |
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13 2. ``x = array([1, 2, 3], [5, 6, 7])`` is a valid statement |
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14 |
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15 a. True |
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16 #. False |
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17 |
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18 Answer: False |
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19 |
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20 3. What will be the output of the following code, |
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21 :: |
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22 |
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23 x = array([[1, 2, 3], ['a', 2, 'c']]) |
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24 print x[0][0] + x[0][1] + x[0][2] |
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25 |
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26 a. 6 |
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27 #. 123 |
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28 #. a2c |
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29 #. Error as array takes only homogeneous elements |
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30 |
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31 Answer: 123 |
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32 |
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33 4. What will be the output of the following code, |
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34 :: |
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35 |
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36 x = [[1, 2, 3], [4.1, 4.2, 4.3], ['6','7',8]] |
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37 y = array(x) |
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38 print y[-1][-2] + y[-1][-1] + y[-2][0] + y[0][-2] |
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39 |
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40 a. 21.1 |
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41 #. 12.5 |
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42 #. 784.12 |
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43 #. Error as array takes only homogeneous elements |
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44 |
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45 .. 4.2 4.3 2 2 |
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46 |
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47 Answer: 784.12 |
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48 |
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49 5. What is the output of the following code, |
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50 :: |
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51 |
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52 x = array([[1, 2, 3], ['a', 2, 'c']]) |
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53 identity(x.shape) |
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54 |
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55 a. Will create an identity matrix of shape (2, 3). |
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56 #. ``identity()`` function takes an integer as argument and a tuple |
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57 is passed. |
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58 #. Will return, array([[1,0,1],[0,1,0]]) |
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59 #. Will return, array([[0,1,0],[0,1,0]]) |
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60 |
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61 Answer: ``identity()`` function takes an integer as argument and a |
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62 tuple is passed. |
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63 |
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64 6. ``ones_like()`` function? |
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65 |
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66 (A) Returns an array of ones with the same shape and type as a |
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67 given array. |
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68 (B) Return a new array of given shape and type, filled with ones. |
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69 |
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70 Read the statements and answer, |
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71 |
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72 a. Only statement A is correct. |
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73 #. Only statement B is correct. |
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74 #. Both statement A and B are correct. |
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75 #. Both statement A and B are incorrect. |
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76 |
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77 Answer: Only statement A is correct. |
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78 |
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79 7. ``zeros_like()`` function? |
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80 |
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81 (A) Return a new array of given shape and type, filled with zeros. |
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82 (B) Returns an array of zeros with the same shape and type as a |
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83 given array. |
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84 |
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85 |
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86 Read the statements and answer, |
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87 |
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88 a. Only statement A is correct. |
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89 #. Only statement B is correct. |
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90 #. Both statement A and B are correct. |
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91 #. Both statement A and B are incorrect. |
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92 |
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93 Answer: Only statement B is correct. |
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94 |
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95 8. What will be output of the following code snippet. |
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96 :: |
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97 |
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98 x = linspace(1,10,10).reshape(5,2) |
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99 print (x[-3]+x[-4]).sum() |
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100 |
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101 a. 10.0 |
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102 #. 18.0 |
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103 #. 14.0 |
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104 #. 16.44 |
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105 #. Error |
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106 |
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107 Answer: 18 |
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108 |
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109 Larger Questions |
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110 ---------------- |
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111 |
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112 .. A minimum of 2 questions here (along with answers) |
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113 |
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114 1. Write a python script to create a 15x15 array of equally spaced 225 |
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115 elements from 1 to 1000, add 5 to each of the diagonal elements and |
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116 find the sum of all odd rows of the array. Say for example the |
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117 array, |
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118 :: |
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119 |
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120 x = array([[1, 2, 3], |
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121 [4, 5, 6], |
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122 [7, 8, 9]]) |
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123 |
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124 will give answer 40 ((1+5) + 2 + 3 + 7 + 8 + (9+5)). |
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125 |
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126 2. For any given array([a1, a2, a3, .. , an]) the Vandermonde matrix |
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127 will be [[1, a1, a1**2, .. , a1**(n-1)], [1, a2, a2**2, .. , |
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128 a2**(n-1)], .. , [1, an, an**2, .. ,an**(n-1)]]. Write a python |
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129 script to generate the Vandermonde matrix and find the determinant |
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130 of the matrix for [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, |
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131 16, 17, 18, 19, 20]. [Hint: to find the determinant use the |
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132 function ``det()`` from ``linalg`` module.] |
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