# SciPy 1.6.1 Release Notes

SciPy 1.6.1 is a bug-fix release with no new features compared to 1.6.0.

Please note that for SciPy wheels to correctly install with Pip on macOS 11, Pip >= 20.3.3 is needed.

## Authors

- Peter Bell

- Evgeni Burovski

- CJ Carey

- Ralf Gommers

- Peter Mahler Larsen

- Cheng H. Lee +

- Cong Ma

- Nicholas McKibben

- Nikola Forró

- Tyler Reddy

- Warren Weckesser

A total of 11 people contributed to this release. People with a “+” by their names contributed a patch for the first time. This list of names is automatically generated, and may not be fully complete.

### Issues closed for 1.6.1

- #13072: BLD: Quadpack undefined references

- #13241: Not enough values to unpack when passing tuple to `blocksize`…

- #13329: Large sparse matrices of big integers lose information

- #13342: fftn crashes if shape arguments are supplied as ndarrays

- #13356: LSQBivariateSpline segmentation fault when quitting the Python…

- #13358: scipy.spatial.transform.Rotation object can not be deepcopied…

- #13408: Type of `has_sorted_indices` property

- #13412: Sorting spherical Voronoi vertices leads to crash in area calculation

- #13421: linear_sum_assignment - support for matrices with more than 2^31…

- #13428: `stats.exponnorm.cdf` returns `nan` for small values of `K`…

- #13465: KDTree.count_neighbors : 0xC0000005 error for tuple of different…

- #13468: directed_hausdorff issue with shuffle

- #13472: Failures on FutureWarnings with numpy 1.20.0 for lfilter, sosfilt…

- #13565: BUG: 32-bit wheels repo test failure in optimize

### Pull requests for 1.6.1

- #13318: REL: prepare for SciPy 1.6.1

- #13344: BUG: fftpack doesn’t work with ndarray shape argument

- #13345: MAINT: Replace scipy.take with numpy.take in FFT function docstrings.

- #13354: BUG: optimize: rename private functions to include leading underscore

- #13387: BUG: Support big-endian platforms and big-endian WAVs

- #13394: BUG: Fix Python crash by allocating larger array in LSQBivariateSpline

- #13400: BUG: sparse: Better validation for BSR ctor

- #13403: BUG: sparse: Propagate dtype through CSR/CSC constructors

- #13414: BUG: maintain dtype of SphericalVoronoi regions

- #13422: FIX: optimize: use npy_intp to store array dims for lsap

- #13425: BUG: spatial: make Rotation picklable

- #13426: BUG: `has_sorted_indices` and `has_canonical_format` should…

- #13430: BUG: stats: Fix exponnorm.cdf and exponnorm.sf for small K

- #13470: MAINT: silence warning generated by `spatial.directed_hausdorff`

- #13473: TST: fix failures due to new FutureWarnings in NumPy 1.21.dev0

- #13479: MAINT: update directed_hausdorff Cython code

- #13485: BUG: KDTree weighted count_neighbors doesn’t work between two…

- #13503: TST: fix `test_fortranfile_read_mixed_record` on big-endian…

- #13518: DOC: document that pip >= 20.3.3 is needed for macOS 11

- #13520: BLD: update reqs based on oldest-supported-numpy in pyproject.toml

- #13567: TST, BUG: adjust tol on test_equivalence