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<li><a class="reference internal" href="#">Plotting 2-D arrays or functions of 2 variables</a><ul>
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<li><a class="reference internal" href="#image">image</a></li>
<li><a class="reference internal" href="#pcolor">pcolor</a></li>
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<div class="section" id="plotting-2-d-arrays-or-functions-of-2-variables">
<span id="arraydata"></span><h1>Plotting 2-D arrays or functions of 2 variables<a class="headerlink" href="#plotting-2-d-arrays-or-functions-of-2-variables" title="Permalink to this headline">¶</a></h1>
<p>In this chapter we will address methods for plotting a
scalar function of two variables. Here are some examples:</p>
<ul class="simple">
<li>A photographic image, represented as a 2-D array of
colors; the grid is regular, with each element of the
array corresponding to a square pixel.</li>
<li>Earth surface elevation and ocean bottom topography,
represented as a 2-D array of heights; the grid is
rectangular in latitude and longitude, but the latitude
increment may not be uniform–often it will decrease
toward the poles.</li>
<li>A mathematical function of two variables, such as a
bivariate Gaussian probability density.</li>
</ul>
<p>Note: in this chapter we will assume the data to be plotted
are on a grid. If you have scalar data of two
variables, but the data are not on a grid - for
example, sea level at island stations - then you will need
to use an interpolation or other gridding routine
before you can use any of the
plotting methods we will discuss here.</p>
<p>As a 2-D plotting library, matplotlib offers two basic
styles of plot for scalar functions of two variables: an
image style and a contour style. The image style renders
the data as either a continuously-varying field of color or
a set of contiguous colored quadrilaterals. Hence, the
image style is a direct representation of the data array.
The contour style is less direct; isolines of the data are
calculated and then either plotted as lines or used to delimit
colored regions.</p>
<div class="section" id="image-or-pcolor-styles">
<span id="image-styles"></span><h2>Image (or pcolor) styles<a class="headerlink" href="#image-or-pcolor-styles" title="Permalink to this headline">¶</a></h2>
<p>some text</p>
<div class="section" id="image">
<span id="id1"></span><h3>image<a class="headerlink" href="#image" title="Permalink to this headline">¶</a></h3>
<p>image text and example</p>
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<div class="section" id="pcolor">
<span id="id2"></span><h3>pcolor<a class="headerlink" href="#pcolor" title="Permalink to this headline">¶</a></h3>
<p>pcolor and pcolorfast, including quadmesh variant</p>
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<div class="section" id="contouring">
<span id="contour"></span><h2>Contouring<a class="headerlink" href="#contouring" title="Permalink to this headline">¶</a></h2>
<p>contour and contourf</p>
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