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52 lines
2.2 KiB
52 lines
2.2 KiB
2 years ago
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1. This question is validated if the text file has successfully been loaded in a NumPy array with
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`genfromtxt('winequality-red.csv', delimiter=',')` and the reduced arrays weights **76800 bytes**
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2. This question is validated if the output is
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```python
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array([[ 7.4 , 0.7 , 0. , 1.9 , 0.076 , 11. , 34. ,
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0.9978, 3.51 , 0.56 , 9.4 , 5. ],
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[ 7.4 , 0.66 , 0. , 1.8 , 0.075 , 13. , 40. ,
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0.9978, 3.51 , 0.56 , 9.4 , 5. ],
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[ 6.7 , 0.58 , 0.08 , 1.8 , 0.097 , 15. , 65. ,
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0.9959, 3.28 , 0.54 , 9.2 , 5. ]])
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```
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This slicing gives the answer `my_data[[1,6,11],:]`.
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3. This question is validated if the answer if False. There many ways to get the answer: find the maximum or check values greater than 20.
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4. This question is validated if the answer is 10.422983114446529.
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5. This question is validated if the answers is:
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```console
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pH stats
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25 percentile: 3.21
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50 percentile: 3.31
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75 percentile: 3.4
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mean: 3.3111131957473416
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min: 2.74
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max: 4.01
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```
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> *Note: Using `percentile` or `median` may give different results depending on the duplicate values in the column. If you do not have my results please use `percentile`.*
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6. This question is validated if the answer is ~`5.2`. The first step is to get the percentile 20% of the column `sulphates`, then create a boolean array that contains `True` of the value is smaller than the percentile 20%, then select this rows with the column quality and compute the `mean`.
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7. This question is validated if the output for the best wines is:
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```python
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array([ 8.56666667, 0.42333333, 0.39111111, 2.57777778, 0.06844444,
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13.27777778, 33.44444444, 0.99521222, 3.26722222, 0.76777778,
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12.09444444, 8. ])
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```
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And the output for the bad wines is:
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```python
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array([ 8.36 , 0.8845 , 0.171 , 2.635 , 0.1225 , 11. ,
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24.9 , 0.997464, 3.398 , 0.57 , 9.955 , 3. ])
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```
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This can be done in three steps: Get the max, create a boolean mask that indicates rows with max quality, use this mask to subset the rows with the best quality and compute the mean on the axis 0.
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