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1 ======== |
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2 Script |
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3 ======== |
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4 |
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5 Welcome. |
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6 |
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7 This spoken tutorial is a self-assessment tutorial and you will be |
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8 able to assess yourself on the concepts learnt in the Module on Arrays |
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9 and Matrices. |
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10 |
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11 |
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12 As with all other assessments we will first start with a few short |
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13 questions that will not take you more that 15 to 20 seconds to |
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14 answer. Then we shall move on to a bigger problem, that you are |
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15 expected to solve in less than 10 mins. |
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16 |
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17 |
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18 * Given a list of marks:: |
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19 |
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20 marks = [10, 20, 30, 50, 55, 75, 83] |
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21 |
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22 How will you convert it to an array? |
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23 |
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24 * What is the shape of the following array?:: |
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25 |
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26 x = array([[1,2,3,4], |
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27 [3,4,2,5]]) |
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28 |
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29 * What is the resulting array:: |
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30 |
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31 a = array([[1, 2], |
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32 [3, 4]]) |
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33 |
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34 a[1,0] = 0 |
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35 |
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36 * What is the resulting array?:: |
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37 |
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38 x = array(([1,2,3,4], |
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39 [2,3,4,5])) |
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40 |
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41 x[-2][-3] = 4 |
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42 |
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43 |
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44 * How do we change the array ``x = array([[1,2,3,4]])`` to |
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45 ``array([[1,2,0,4]])``? |
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46 |
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47 * How do we get the slice:: |
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48 |
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49 array([[2,3], |
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50 [4,2]]) |
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51 |
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52 out of the array:: |
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53 |
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54 x = array([[1,2,3,4], |
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55 [3,4,2,5]]) |
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56 |
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57 |
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58 * What is the output of x[::3,::3], when x is:: |
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59 |
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60 x = array([[9,18,27], |
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61 [30,60,90], |
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62 [14,7,1]]) |
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63 |
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64 * How do you get the transpose of this array?:: |
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65 |
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66 a = array([[1, 2], |
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67 [3, 4]]) |
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68 |
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69 * What is the output of the following?:: |
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70 |
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71 a = array([[1, 2], |
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72 [3, 4]]) |
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73 |
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74 b = array([[1, 1], |
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75 [2, 2]]) |
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76 |
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77 a*b |
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78 |
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79 |
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80 {{{ show slides with solutions to these problems }}} |
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81 |
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82 Now, let us move on to a larger problem. From the image |
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83 `tagore-einstein.png`` |
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84 |
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85 + extract the face of Einstein alone. |
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86 + extract the face of Tagore alone. |
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87 + get a smaller copy of the image, that is a fourth it's size. |
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88 |
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89 |
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90 {{{ show slide with solutions to the problem }}} |
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91 |
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92 Thank You! |