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1 Objective Questions |
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2 ------------------- |
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3 |
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4 1. What does ones_like([1, 2, 3]) produce |
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5 |
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6 a. array([1, 1, 1]) |
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7 #. [1, 1, 1] |
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8 #. [1.0, 1.0, 1.0] |
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9 #. Error |
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10 |
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11 Answer: array([1, 1, 1]) |
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12 |
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13 2. What does ones_like([1.2, 3, 4, 5]) produce |
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14 |
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15 a. [1.2, 3, 4, 5] |
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16 #. array([1.0, 1.0, 1.0, 1.0]) |
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17 #. array([1, 1, 1, 1]) |
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18 #. array([1.2, 3, 4, 5]) |
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19 |
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20 Answer: array([1.0, 1.0, 1.0, 1.0]) |
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21 |
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22 3. The plot of ``u`` vs ``v`` is a bunch of scattered points that show a |
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23 linear trend. How do you find the least square fit line of ``u`` vs ``v``. |
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24 |
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25 Answer:: |
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26 |
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27 A = array(u, ones_like(u)).T |
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28 result = lstsq(A, v) |
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29 m, c = result[0] |
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30 |
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31 lst_line = m * u + c |
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32 |