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33 lines
804 B
33 lines
804 B
2 years ago
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##### The exercice is validated is all questions of the exercice are validated
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##### This question is validated if, without having used a for loop or having filled the array manually, the output is:
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```console
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[[ 7. 1. 7.]
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[nan 2. 2.]
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[nan 8. 8.]
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[ 9. 3. 9.]
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[ 8. 9. 8.]
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[nan 2. 2.]
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[ 8. 2. 8.]
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[nan 6. 6.]
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[ 9. 2. 9.]
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[ 8. 5. 8.]]
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```
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There are two steps in this exercise:
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- Create the vector that contains the grade of the first exam if available or the second. This can be done using `np.where`:
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```python
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np.where(np.isnan(grades[:, 0]), grades[:, 1], grades[:, 0])
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```
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- Add this vector as third column of the array. Here are two ways:
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```python
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np.insert(arr = grades, values = new_vector, axis = 1, obj = 2)
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np.hstack((grades, new_vector[:, None]))
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```
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