# SciPy 1.2.3 Release Notes

SciPy 1.2.3 is a bug-fix release with no new features compared to 1.2.2. It is part of the long-term support (LTS) release series for Python 2.7.

## Authors

- Geordie McBain

- Matt Haberland

- David Hagen

- Tyler Reddy

- Pauli Virtanen

- Eric Larson

- Yu Feng

- ananyashreyjain

- Nikolay Mayorov

- Evgeni Burovski

- Warren Weckesser

### Issues closed for 1.2.3

- #4915: Bug in unique_roots in scipy.signal.signaltools.py for roots with same magnitude

- #5546: ValueError raised if scipy.sparse.linalg.expm recieves array larger than 200x200

- #7117: Warn users when using float32 input data to curve_fit and friends

- #7906: Wrong result from scipy.interpolate.UnivariateSpline.integral for out-of-bounds

- #9581: Least-squares minimization fails silently when x and y data are different types

- #9901: lsoda fails to detect stiff problem when called from solve_ivp

- #9988: doc build broken with Sphinx 2.0.0

- #10303: BUG: optimize: linprog failing TestLinprogSimplexBland::test_unbounded_below_no_presolve_corrected

- #10376: TST: Travis CI fails (with pytest 5.0 ?)

- #10384: CircleCI doc build failing on new warnings

- #10535: TST: master branch CI failures

- #11121: Calls to `scipy.interpolate.splprep` increase RAM usage.

- #11198: BUG: sparse eigs (arpack) shift-invert drops the smallest eigenvalue for some k

- #11266: Sparse matrix constructor data type detection changes on Numpy 1.18.0

### Pull requests for 1.2.3

- #9992: MAINT: Undo Sphinx pin

- #10071: DOC: reconstruct SuperLU permutation matrices avoiding SparseEfficiencyWarning

- #10076: BUG: optimize: fix curve_fit for mixed float32/float64 input

- #10138: BUG: special: Invalid arguments to ellip_harm can crash Python.

- #10306: BUG: optimize: Fix for 10303

- #10309: BUG: Pass jac=None directly to lsoda

- #10377: TST, MAINT: adjustments for pytest 5.0

- #10379: BUG: sparse: set writeability to be forward-compatible with numpy>=1.17

- #10426: MAINT: Fix doc build bugs

- #10540: MAINT: Fix Travis and Circle

- #10633: BUG: interpolate: integral(a, b) should be zero when both limits are outside of the interpolation range

- #10833: BUG: Fix subspace_angles for complex values

- #10882: BUG: sparse/arpack: fix incorrect code for complex hermitian M

- #10906: BUG: sparse/linalg: fix expm for np.matrix inputs

- #10961: BUG: Fix signal.unique_roots

- #11126: BUG: interpolate/fitpack: fix memory leak in splprep

- #11199: BUG: sparse.linalg: mistake in unsymm. real shift-invert ARPACK eigenvalue selection

- #11269: Fix: Sparse matrix constructor data type detection changes on Numpy 1.18.0