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<div><h1 id="ch:numerics">5 Working with data</h1>
<p>This chapter returns to Pyxplot’s commands for acting on data stored in files. Chapter <a href="ch-first_steps.html">3</a> has already introduced the <tt class="tt">plot</tt> command, which draws graphs, but there are also commands for tabulating data to new data files, for computing histograms, for interpolating data, and for taking Fourier transforms. </p><p>Section <a href="sec-plot_datafiles.html">3.8</a> has already introduced the options which can be used to select data from particular columns or which satisfy particular criteria: <tt class="tt">using</tt>, <tt class="tt">index</tt>, <tt class="tt">every</tt> and <tt class="tt">select</tt>. These options are universal to all of Pyxplot’s commands which operate on data sets. In all cases, data sets can be read from files, sampled from functions, or specified as a colon-separated list of vectors (see Section <a href="sec-vectorplot.html">6.5.3</a>). </p><p>This chapter begins by describing other common features of these commands, before moving on to describe each command in turn. It leaves the details of the <tt class="tt">plot</tt> command, which was introduced in Chapter <a href="ch-first_steps.html">3</a>, to be described in full detail in Chapter <a href="ch-plotting.html">1</a>. </p></div>
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<li><a href="sec-filters.html">5.1 Input filters</a>
</li><li><a href="sect0030.html">5.2 Reading data from a pipe</a>
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<li><a href="sect0032.html">5.7.1 Two-dimensional interpolation</a>
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