8000 BUG: 0 quantile for "inverted_cdf" methods gives highest value in array. · Issue #24593 · numpy/numpy · GitHub
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BUG: 0 quantile for "inverted_cdf" methods gives highest value in array. #24593

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matthew-brett opened this issue Aug 30, 2023 · 2 comments
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BUG: 0 quantile for "inverted_cdf" methods gives highest value in array. #24593

matthew-brett opened this issue Aug 30, 2023 · 2 comments
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@matthew-brett
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Describe the issue:

See the code below. Asking for the 0 quantile, rather than some quantile very slightly greater than 0, returns the largest value in the array, when using method=:

  • 'averaged_inverted_cdf'
  • 'interpolated_inverted_cdf'

Reproduce the code example:

import numpy as np

data = np.arange(100)

for method in ('averaged_inverted_cdf', 'interpolated_inverted_cdf'):
    print('Using', method)
    print(np.quantile(data, 0, method=method))
    print(np.quantile(data, 1e-15, method=method))
    print(np.quantile(data, [0, 1e-15], method=method))

Error message:

The result is:


Using averaged_inverted_cdf
99
0.0
[0. 0.]
Using interpolated_inverted_cdf
99
0.0
[0. 0.]

where the first value for each method is clearly incorrect.



### Runtime information:

In [1] import sys, numpy; print(numpy.version); print(sys.version)
1.26.0b1
3.10.11 (main, Apr 7 2023, 07:24:53) [Clang 14.0.0 (clang-1400.0.29.202)]
In [2]: print(numpy.show_runtime())
WARNING: threadpoolctl not found in system! Install it by pip install threadpoolctl. Once installed, try np.show_runtime again for more detailed build information
[{'numpy_version': '1.26.0b1',
'python': '3.10.11 (main, Apr 7 2023, 07:24:53) [Clang 14.0.0 '
'(clang-1400.0.29.202)]',
'uname': uname_result(system='Darwin', node='nipraxis.dynevor.org', release='22.6.0', version='Darwin Kernel Version 22.6.0: Wed Jul 5 22:17:35 PDT 2023; root:xnu-8796.141.3~6/RELEASE_ARM64_T8112', machine='arm64')},
{'simd_extensions': {'baseline': ['NEON', 'NEON_FP16', 'NEON_VFPV4', 'ASIMD'],
'found': ['ASIMDHP'],
'not_found': ['ASIMDFHM']}}]


### Context for the issue:

_No response_
@eendebakpt
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This is a duplicate of #24592

@seberg
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seberg commented Feb 13, 2024

This was fixed, but not linked from the PR (which closed the duplicate)

@seberg seberg closed this as completed Feb 13, 2024
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