other:python:misc_by_jyp
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| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
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other:python:misc_by_jyp [2022/02/21 15:15] jypeter [numpy related stuff] |
other:python:misc_by_jyp [2022/02/21 16:31] jypeter [numpy related stuff] Added ufuncs |
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| Line 253: | Line 253: | ||
| 15.5 | 15.5 | ||
| >>> vals.sum() # The usual and easy way to do it | >>> vals.sum() # The usual and easy way to do it | ||
| - | 15.5</code> | + | 15.5 |
| + | |||
| + | # Compute the sum of the elements of 'nb_unique' | ||
| + | # AND keep (accumulate) the intermediate results | ||
| + | >>> nb_unique | ||
| + | array([3, 3, 4]) | ||
| + | >>> np.add.accumulate(nb_unique) | ||
| + | array([ 3, 6, 10]) | ||
| + | |||
| + | # The accumulated values can be used as indices to separate the different groups of sorted values! | ||
| + | >>> sorted_vals | ||
| + | array([1. , 1. , 1. , 1.5, 1.5, 1.5, 2. , 2. , 2. , 2. ]) | ||
| + | >>> sorted_vals[0:3] | ||
| + | array([1., 1., 1.]) | ||
| + | >>> sorted_vals[3:6] | ||
| + | array([1.5, 1.5, 1.5]) | ||
| + | >>> sorted_vals[6:10] | ||
| + | array([2., 2., 2., 2.]) | ||
| + | |||
| + | # Compute the sum of each equal-value group | ||
| + | >>> sorted_vals[0:3].sum(), sorted_vals[3:6].sum(), sorted_vals[6:10].sum() | ||
| + | (3.0, 4.5, 8.0)</code> | ||
| /* | /* | ||
other/python/misc_by_jyp.txt · Last modified: 2024/04/19 12:02 by jypeter
