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<div class="section" id="pywavelets-0-4-0-release-notes">
<h1><a class="toc-backref" href="#id1">PyWavelets 0.4.0 Release Notes</a><a class="headerlink" href="#pywavelets-0-4-0-release-notes" title="Permalink to this headline">¶</a></h1>
<div class="contents topic" id="contents">
<p class="topic-title first">Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#pywavelets-0-4-0-release-notes" id="id1">PyWavelets 0.4.0 Release Notes</a><ul>
<li><a class="reference internal" href="#new-features" id="id2">New features</a><ul>
<li><a class="reference internal" href="#d-and-2d-inverse-stationary-wavelet-transforms" id="id3">1D and 2D inverse stationary wavelet transforms</a></li>
<li><a class="reference internal" href="#faster-2d-and-nd-wavelet-transforms" id="id4">Faster 2D and nD wavelet transforms</a></li>
<li><a class="reference internal" href="#complex-floating-point-support" id="id5">Complex floating point support</a></li>
<li><a class="reference internal" href="#nd-implementation-of-the-multilevel-dwt-and-idwt" id="id6">nD implementation of the multilevel DWT and IDWT</a></li>
<li><a class="reference internal" href="#wavelet-transforms-can-be-applied-along-a-specific-axis-axes" id="id7">Wavelet transforms can be applied along a specific axis/axes</a></li>
<li><a class="reference internal" href="#example-datasets" id="id8">Example Datasets</a></li>
</ul>
</li>
<li><a class="reference internal" href="#deprecated-features" id="id9">Deprecated features</a></li>
<li><a class="reference internal" href="#backwards-incompatible-changes" id="id10">Backwards incompatible changes</a></li>
<li><a class="reference internal" href="#bugs-fixed" id="id11">Bugs Fixed</a></li>
<li><a class="reference internal" href="#other-changes" id="id12">Other changes</a></li>
<li><a class="reference internal" href="#authors" id="id13">Authors</a><ul>
<li><a class="reference internal" href="#issues-closed-for-v0-4-0" id="id14">Issues closed for v0.4.0</a></li>
<li><a class="reference internal" href="#pull-requests-for-v0-4-0" id="id15">Pull requests for v0.4.0</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<p>PyWavelets 0.4.0 is the culmination of 6 months of work. In addition to
several new features, some changes and deprecations have been made to streamline
the API.</p>
<p>This release requires Python 2.6, 2.7 or 3.3-3.5 and NumPy 1.6.2 or greater.</p>
<p>Highlights of this release include:</p>
<ul class="simple">
<li>1D and 2D inverse stationary wavelet transforms</li>
<li>Substantially faster 2D and nD discrete wavelet transforms</li>
<li>Complex number support</li>
<li>nD versions of the multilevel DWT and IDWT</li>
</ul>
<div class="section" id="new-features">
<h2><a class="toc-backref" href="#id2">New features</a><a class="headerlink" href="#new-features" title="Permalink to this headline">¶</a></h2>
<div class="section" id="d-and-2d-inverse-stationary-wavelet-transforms">
<h3><a class="toc-backref" href="#id3">1D and 2D inverse stationary wavelet transforms</a><a class="headerlink" href="#d-and-2d-inverse-stationary-wavelet-transforms" title="Permalink to this headline">¶</a></h3>
<p>1D (<code class="docutils literal notranslate"><span class="pre">iswt</span></code>) and 2D (<code class="docutils literal notranslate"><span class="pre">iswt2</span></code>) inverse stationary wavelet transforms were
added. These currently only support even length inputs.</p>
</div>
<div class="section" id="faster-2d-and-nd-wavelet-transforms">
<h3><a class="toc-backref" href="#id4">Faster 2D and nD wavelet transforms</a><a class="headerlink" href="#faster-2d-and-nd-wavelet-transforms" title="Permalink to this headline">¶</a></h3>
<p>The multidimensional DWT and IDWT code was refactored and is now an order of
magnitude faster than in previous releases. The following functions benefit:
<code class="docutils literal notranslate"><span class="pre">dwt2</span></code>, <code class="docutils literal notranslate"><span class="pre">idwt2</span></code>, <code class="docutils literal notranslate"><span class="pre">dwtn</span></code>, <code class="docutils literal notranslate"><span class="pre">idwtn</span></code>.</p>
</div>
<div class="section" id="complex-floating-point-support">
<h3><a class="toc-backref" href="#id5">Complex floating point support</a><a class="headerlink" href="#complex-floating-point-support" title="Permalink to this headline">¶</a></h3>
<p>64 and 128-bit complex data types are now supported by all wavelet transforms.</p>
</div>
<div class="section" id="nd-implementation-of-the-multilevel-dwt-and-idwt">
<h3><a class="toc-backref" href="#id6">nD implementation of the multilevel DWT and IDWT</a><a class="headerlink" href="#nd-implementation-of-the-multilevel-dwt-and-idwt" title="Permalink to this headline">¶</a></h3>
<p>The existing 1D and 2D multilevel transforms were supplemented with an nD
implementation.</p>
</div>
<div class="section" id="wavelet-transforms-can-be-applied-along-a-specific-axis-axes">
<h3><a class="toc-backref" href="#id7">Wavelet transforms can be applied along a specific axis/axes</a><a class="headerlink" href="#wavelet-transforms-can-be-applied-along-a-specific-axis-axes" title="Permalink to this headline">¶</a></h3>
<p>All wavelet transform functions now support explicit specification of the axis
or axes upon which to perform the transform.</p>
</div>
<div class="section" id="example-datasets">
<h3><a class="toc-backref" href="#id8">Example Datasets</a><a class="headerlink" href="#example-datasets" title="Permalink to this headline">¶</a></h3>
<p>Two additional 2D grayscale images were added (<cite>camera</cite>, <cite>ascent</cite>). The
previously existing 1D ECG data (<cite>ecg</cite>) and the 2D aerial image (<cite>aero</cite>)
used in the demos can also now be imported via functions defined in
<cite>pywt.data</cite> (e.g. <code class="docutils literal notranslate"><span class="pre">camera</span> <span class="pre">=</span> <span class="pre">pywt.data.camera()</span></code>)</p>
</div>
</div>
<div class="section" id="deprecated-features">
<h2><a class="toc-backref" href="#id9">Deprecated features</a><a class="headerlink" href="#deprecated-features" title="Permalink to this headline">¶</a></h2>
<p>A number of functions have been renamed, the old names are deprecated and will
be removed in a future release:</p>
<ul class="simple">
<li><code class="docutils literal notranslate"><span class="pre">intwave</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">integrate_wavelet</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">centrfrq</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">central_frequency</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">scal2frq</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">scale2frequency</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">orthfilt</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">orthogonal_filter_bank</span></code></li>
</ul>
<p>Integration of general signals (i.e. not wavelets) with <code class="docutils literal notranslate"><span class="pre">integrate_wavelet</span></code>
is deprecated.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">MODES</span></code> object and its attributes are deprecated. The new name is
<code class="docutils literal notranslate"><span class="pre">Modes</span></code>, and the attribute names are expanded:</p>
<ul class="simple">
<li><code class="docutils literal notranslate"><span class="pre">zpd</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">zero</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">cpd</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">constant</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">sp1</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">smooth</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">sym</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">symmetric</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">ppd</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">periodic</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">per</span></code>, renamed to <code class="docutils literal notranslate"><span class="pre">periodization</span></code></li>
</ul>
</div>
<div class="section" id="backwards-incompatible-changes">
<h2><a class="toc-backref" href="#id10">Backwards incompatible changes</a><a class="headerlink" href="#backwards-incompatible-changes" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">idwt</span></code> no longer takes a <code class="docutils literal notranslate"><span class="pre">correct_size</span></code> parameter. As a consequence,
<code class="docutils literal notranslate"><span class="pre">idwt2</span></code> inputs must match exactly in length. For multilevel transforms, where
arrays differing in size by one element may be produced, use the <code class="docutils literal notranslate"><span class="pre">waverec</span></code>
functions from the <code class="docutils literal notranslate"><span class="pre">multilevel</span></code> module instead.</p>
</div>
<div class="section" id="bugs-fixed">
<h2><a class="toc-backref" href="#id11">Bugs Fixed</a><a class="headerlink" href="#bugs-fixed" title="Permalink to this headline">¶</a></h2>
<p>float32 inputs were not always respected. All transforms now return float32
outputs when called using float32 inputs.</p>
<p>Incorrect detail coefficients were returned by <cite>downcoef</cite> when <cite>level > 1</cite>.</p>
</div>
<div class="section" id="other-changes">
<h2><a class="toc-backref" href="#id12">Other changes</a><a class="headerlink" href="#other-changes" title="Permalink to this headline">¶</a></h2>
<p>Much of the API documentation is now autogenerated from the corresponding
function docstrings. The numpydoc sphinx extension is now needed to build the
documentation.</p>
</div>
<div class="section" id="authors">
<h2><a class="toc-backref" href="#id13">Authors</a><a class="headerlink" href="#authors" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Thomas Arildsen +</li>
<li>François Boulogne</li>
<li>Ralf Gommers</li>
<li>Gregory R. Lee</li>
<li>Michael Marino +</li>
<li>Aaron O’Leary +</li>
<li>Daniele Tricoli +</li>
<li>Kai Wohlfahrt</li>
</ul>
<p>A total of 8 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.</p>
<div class="section" id="issues-closed-for-v0-4-0">
<h3><a class="toc-backref" href="#id14">Issues closed for v0.4.0</a><a class="headerlink" href="#issues-closed-for-v0-4-0" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/issues/46">#46</a>: Independent test comparison</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/issues/95">#95</a>: Simplify Matlab tests</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/issues/97">#97</a>: BUG: erroneous detail coefficients returned by downcoef with…</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/issues/140">#140</a>: demo/dwt_signal_decomposition.py : TypeError: object of type…</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/issues/141">#141</a>: Documentation needs update: ImportError: cannot import name ‘multilevel’</li>
</ul>
</div>
<div class="section" id="pull-requests-for-v0-4-0">
<h3><a class="toc-backref" href="#id15">Pull requests for v0.4.0</a><a class="headerlink" href="#pull-requests-for-v0-4-0" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/55">#55</a>: [RFC] Api changes</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/59">#59</a>: Refactor convolution.c.src</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/64">#64</a>: MAINT: make LH, HL variable names in idwt2 consistent with dwt2</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/67">#67</a>: ENH: add wavedecn and waverecn functions</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/68">#68</a>: ENH: Faster dwtn and idwtn</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/88">#88</a>: DOC minor edit about possible naming</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/93">#93</a>: Added implementation of iswt and iswt2</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/98">#98</a>: fix downcoef detail coefficients for level > 1</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/99">#99</a>: complex support in all dwt and idwt related functions</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/100">#100</a>: replace mlabwrap with python-matlab-bridge in Matlab tests</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/102">#102</a>: Replace some .src expansion with macros</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/104">#104</a>: Faster idwtn/dwtn</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/106">#106</a>: make sure transforms respect float32 dtype</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/109">#109</a>: DOC: fix broken link in sidebar for html docs.</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/112">#112</a>: Complex fix</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/113">#113</a>: TST: don’t build .exe installers on Appveyor anymore, only wheels.</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/116">#116</a>: [RFC] ENH: Add axis argument to dwt</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/117">#117</a>: MAINT: remove deprecated for loop syntax from Cython code</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/121">#121</a>: Fix typo</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/123">#123</a>: MAINT: remove some unused imports</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/124">#124</a>: switch travis from python 3.5-dev to 3.5</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/130">#130</a>: Add axis argument to multidim</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/138">#138</a>: WIP: Documentation updates for v0.4.0</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/139">#139</a>: Autogenerate function API docs</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/142">#142</a>: fix broken docstring examples in _multilevel.py</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/143">#143</a>: handle None properly in waverec</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/144">#144</a>: Add importable images</li>
<li><a class="reference external" href="https://github.com/PyWavelets/pywt/pull/145">#145</a>: DOC: Document MSVC versions</li>
</ul>
</div>
</div>
</div>
</div>
</div>
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<h3><a href="index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">PyWavelets 0.4.0 Release Notes</a><ul>
<li><a class="reference internal" href="#new-features">New features</a><ul>
<li><a class="reference internal" href="#d-and-2d-inverse-stationary-wavelet-transforms">1D and 2D inverse stationary wavelet transforms</a></li>
<li><a class="reference internal" href="#faster-2d-and-nd-wavelet-transforms">Faster 2D and nD wavelet transforms</a></li>
<li><a class="reference internal" href="#complex-floating-point-support">Complex floating point support</a></li>
<li><a class="reference internal" href="#nd-implementation-of-the-multilevel-dwt-and-idwt">nD implementation of the multilevel DWT and IDWT</a></li>
<li><a class="reference internal" href="#wavelet-transforms-can-be-applied-along-a-specific-axis-axes">Wavelet transforms can be applied along a specific axis/axes</a></li>
<li><a class="reference internal" href="#example-datasets">Example Datasets</a></li>
</ul>
</li>
<li><a class="reference internal" href="#deprecated-features">Deprecated features</a></li>
<li><a class="reference internal" href="#backwards-incompatible-changes">Backwards incompatible changes</a></li>
<li><a class="reference internal" href="#bugs-fixed">Bugs Fixed</a></li>
<li><a class="reference internal" href="#other-changes">Other changes</a></li>
<li><a class="reference internal" href="#authors">Authors</a><ul>
<li><a class="reference internal" href="#issues-closed-for-v0-4-0">Issues closed for v0.4.0</a></li>
<li><a class="reference internal" href="#pull-requests-for-v0-4-0">Pull requests for v0.4.0</a></li>
</ul>
</li>
</ul>
</li>
</ul>
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