SciPy 0.9.0 Release Notes#
SciPy 0.9.0 is the culmination of 6 months of hard work. It contains many new features, numerous bug-fixes, improved test coverage and better documentation. There have been a number of deprecations and API changes in this release, which are documented below. All users are encouraged to upgrade to this release, as there are a large number of bug-fixes and optimizations. Moreover, our development attention will now shift to bug-fix releases on the 0.9.x branch, and on adding new features on the development trunk.
This release requires Python 2.4 - 2.7 or 3.1 - and NumPy 1.5 or greater.
Please note that SciPy is still considered to have “Beta” status, as we work toward a SciPy 1.0.0 release. The 1.0.0 release will mark a major milestone in the development of SciPy, after which changing the package structure or API will be much more difficult. Whilst these pre-1.0 releases are considered to have “Beta” status, we are committed to making them as bug-free as possible.
However, until the 1.0 release, we are aggressively reviewing and refining the functionality, organization, and interface. This is being done in an effort to make the package as coherent, intuitive, and useful as possible. To achieve this, we need help from the community of users. Specifically, we need feedback regarding all aspects of the project - everything - from which algorithms we implement, to details about our function’s call signatures.
Scipy 0.9.0 is the first SciPy release to support Python 3. The only module
that is not yet ported is
Scipy source code location to be changed#
Soon after this release, Scipy will stop using SVN as the version control system, and move to Git. The development source code for Scipy can from then on be found at
Delaunay tessellations (
Scipy now includes routines for computing Delaunay tessellations in N
dimensions, powered by the Qhull computational geometry library. Such
calculations can now make use of the new
N-dimensional interpolation (
Support for scattered data interpolation is now significantly
improved. This version includes a
function that can perform linear and nearest-neighbour interpolation
for N-dimensional scattered data, in addition to cubic spline
(C1-smooth) interpolation in 2D and 1D. An object-oriented interface
to each interpolator type is also available.
Nonlinear equation solvers (
Scipy includes new routines for large-scale nonlinear equation solving
scipy.optimize. The following methods are implemented:
(Generalized) secant methods:
Limited-memory Broyden methods (
Anderson method (
Simple iterations (
scipy.optimize.nonlin module was completely rewritten, and
some of the functions were deprecated (see above).
New linear algebra routines (
Scipy now contains routines for effectively solving triangular
equation systems (
Improved FIR filter design functions (
scipy.signal.firwin was enhanced to allow the
design of highpass, bandpass, bandstop and multi-band FIR filters.
scipy.signal.firwin2 was added. This function
uses the window method to create a linear phase FIR filter with
an arbitrary frequency response.
Improved statistical tests (
A new function
scipy.stats.fisher_exact was added, that provides Fisher’s
exact test for 2x2 contingency tables.
scipy.stats.kendalltau was rewritten to make it much faster
(O(n log(n)) vs O(n^2)).
Obsolete nonlinear solvers (in
The following nonlinear solvers from
broyden3(obsoleted by new limited-memory broyden methods)
The deprecated modules
ppimport were removed
output_type keyword in many
scipy.ndimage interpolation functions
has been removed.
econ keyword in
scipy.linalg.qr has been removed. The same
functionality is still available by specifying
Old correlate/convolve behavior (in
The old behavior for
scipy.signal.correlate2d was deprecated in
0.8.0 and has now been removed. Convolve and correlate used to swap their
arguments if the second argument has dimensions larger than the first one, and
the mode was relative to the input with the largest dimension. The current
behavior is to never swap the inputs, which is what most people expect, and is
how correlation is usually defined.
Many functions in
scipy.stats that are either available from numpy or have
been superseded, and have been deprecated since version 0.7, have been removed:
std, var, mean, median, cov, corrcoef, z, zs, stderr,
samplestd, samplevar, pdfapprox, pdf_moments and erfc. These changes
are mirrored in
Several methods of the sparse matrix classes in
scipy.sparse which had
been deprecated since version 0.7 were removed: save, rowcol, getdata,
listprint, ensure_sorted_indices, matvec, matmat and rmatvec.
lil_diags were removed from
scipy.sparse. The first three functions
are still available as
The dims and nzmax keywords were removed from the sparse matrix constructor. The colind and rowind attributes were removed from CSR and CSC matrices respectively.
A duplicated interface to the ARPACK library was removed.
ARPACK interface changes#
The interface to the ARPACK eigenvalue routines in
scipy.sparse.linalg was changed for more robustness.
The eigenvalue and SVD routines now raise
the eigenvalue iteration fails to converge. If partially converged results
are desired, they can be accessed as follows:
import numpy as np from scipy.sparse.linalg import eigs, ArpackNoConvergence m = np.random.randn(30, 30) try: w, v = eigs(m, 6) except ArpackNoConvergence, err: partially_converged_w = err.eigenvalues partially_converged_v = err.eigenvectors
Several bugs were also fixed.
The routines were moreover renamed as follows:
eigen –> eigs
eigen_symmetric –> eigsh
svd –> svds