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<main class="col-12 col-md-9 col-xl-7 py-md-5 pl-md-5 pr-md-4 bd-content" role="main">
<div>
<section id="changes-for-0-54">
<h1>Changes for 0.54<a class="headerlink" href="#changes-for-0-54" title="Permalink to this headline">¶</a></h1>
<section id="matlab-interface">
<h2>MATLAB interface<a class="headerlink" href="#matlab-interface" title="Permalink to this headline">¶</a></h2>
<section id="dpi">
<h3>dpi<a class="headerlink" href="#dpi" title="Permalink to this headline">¶</a></h3>
<p>Several of the backends used a PIXELS_PER_INCH hack that I added to
try and make images render consistently across backends. This just
complicated matters. So you may find that some font sizes and line
widths appear different than before. Apologies for the
inconvenience. You should set the dpi to an accurate value for your
screen to get true sizes.</p>
</section>
<section id="pcolor-and-scatter">
<h3>pcolor and scatter<a class="headerlink" href="#pcolor-and-scatter" title="Permalink to this headline">¶</a></h3>
<p>There are two changes to the MATLAB interface API, both involving the
patch drawing commands. For efficiency, pcolor and scatter have been
rewritten to use polygon collections, which are a new set of objects
from matplotlib.collections designed to enable efficient handling of
large collections of objects. These new collections make it possible
to build large scatter plots or pcolor plots with no loops at the
python level, and are significantly faster than their predecessors.
The original pcolor and scatter functions are retained as
pcolor_classic and scatter_classic.</p>
<p>The return value from pcolor is a PolyCollection. Most of the
properties that are available on rectangles or other patches are also
available on PolyCollections, e.g., you can say:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">c</span> <span class="o">=</span> <span class="n">scatter</span><span class="p">(</span><span class="n">blah</span><span class="p">,</span> <span class="n">blah</span><span class="p">)</span>
<span class="n">c</span><span class="o">.</span><span class="n">set_linewidth</span><span class="p">(</span><span class="mf">1.0</span><span class="p">)</span>
<span class="n">c</span><span class="o">.</span><span class="n">set_facecolor</span><span class="p">(</span><span class="s1">'r'</span><span class="p">)</span>
<span class="n">c</span><span class="o">.</span><span class="n">set_alpha</span><span class="p">(</span><span class="mf">0.5</span><span class="p">)</span>
</pre></div>
</div>
<p>or:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">c</span> <span class="o">=</span> <span class="n">scatter</span><span class="p">(</span><span class="n">blah</span><span class="p">,</span> <span class="n">blah</span><span class="p">)</span>
<span class="nb">set</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="s1">'linewidth'</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">,</span> <span class="s1">'facecolor'</span><span class="p">,</span> <span class="s1">'r'</span><span class="p">,</span> <span class="s1">'alpha'</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">)</span>
</pre></div>
</div>
<p>Because the collection is a single object, you no longer need to loop
over the return value of scatter or pcolor to set properties for the
entire list.</p>
<p>If you want the different elements of a collection to vary on a
property, e.g., to have different line widths, see matplotlib.collections
for a discussion on how to set the properties as a sequence.</p>
<p>For scatter, the size argument is now in points^2 (the area of the
symbol in points) as in MATLAB and is not in data coords as before.
Using sizes in data coords caused several problems. So you will need
to adjust your size arguments accordingly or use scatter_classic.</p>
</section>
<section id="mathtext-spacing">
<h3>mathtext spacing<a class="headerlink" href="#mathtext-spacing" title="Permalink to this headline">¶</a></h3>
<p>For reasons not clear to me (and which I'll eventually fix) spacing no
longer works in font groups. However, I added three new spacing
commands which compensate for this '' (regular space), '/' (small
space) and 'hspace{frac}' where frac is a fraction of fontsize in
points. You will need to quote spaces in font strings, is:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">title</span><span class="p">(</span><span class="sa">r</span><span class="s1">'$\rm{Histogram\ of\ IQ:}\ \mu=100,\ \sigma=15$'</span><span class="p">)</span>
</pre></div>
</div>
</section>
</section>
<section id="object-interface-application-programmers">
<h2>Object interface - Application programmers<a class="headerlink" href="#object-interface-application-programmers" title="Permalink to this headline">¶</a></h2>
<section id="autoscaling">
<h3>Autoscaling<a class="headerlink" href="#autoscaling" title="Permalink to this headline">¶</a></h3>