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<div><h1 id="a0000000066">1.5 Plotting functions in exotic styles</h1>
<p>The use of plot styles which take more than two columns of input data to plot functions requires more than one function to be supplied. When functions are plotted with syntax such as </p><pre>
plot sin(x) with lines
</pre><p>two columns of data are generated: the first contains values of <img src="images/img-0030.png" alt="$x$" style="vertical-align:0px; 
                                     width:10px; 
                                     height:8px" class="math gen" /> – plotted against the horizontal axis – and the second contains values of <img src="images/img-0026.png" alt="$\sin (x)$" style="vertical-align:-4px; 
                                     width:45px; 
                                     height:18px" class="math gen" /> – plotted against the vertical axis. Syntax such as </p><pre>
plot f(x):g(x) with yerrorbars
</pre><p>generates three columns of data. As before, the first contains values of <img src="images/img-0030.png" alt="$x$" style="vertical-align:0px; 
                                     width:10px; 
                                     height:8px" class="math gen" />. The second and third contain samples from the colon-separated functions <img src="images/img-0086.png" alt="$f(x)$" style="vertical-align:-4px; 
                                     width:32px; 
                                     height:18px" class="math gen" /> and <img src="images/img-0391.png" alt="$g(x)$" style="vertical-align:-4px; 
                                     width:32px; 
                                     height:18px" class="math gen" />. Specifically, in this example, <img src="images/img-0391.png" alt="$g(x)$" style="vertical-align:-4px; 
                                     width:32px; 
                                     height:18px" class="math gen" /> provides the uncertainty in the value of <img src="images/img-0086.png" alt="$f(x)$" style="vertical-align:-4px; 
                                     width:32px; 
                                     height:18px" class="math gen" />. The <tt class="tt">using</tt> modifier may also be used in combination with such syntax, as in </p><pre>
plot f(x):g(x) using 2:3
</pre><p>though this example is not sensible. <img src="images/img-0391.png" alt="$g(x)$" style="vertical-align:-4px; 
                                     width:32px; 
                                     height:18px" class="math gen" /> would be plotted on the <tt class="tt">y</tt>-axis, against <img src="images/img-0086.png" alt="$f(x)$" style="vertical-align:-4px; 
                                     width:32px; 
                                     height:18px" class="math gen" /> on the <tt class="tt">x</tt>-axis. However, this is unlikely to be sensible because the range of values of <img src="images/img-0030.png" alt="$x$" style="vertical-align:0px; 
                                     width:10px; 
                                     height:8px" class="math gen" /> substituting into these expressions would correspond to the range of the plot’s horizontal axis. The result might be particularly unexpected if the above were attempted with an autoscaling horizontal axis – Pyxplot would find itself autoscaling the <tt class="tt">x</tt>-axis range to the spread of values of <img src="images/img-0086.png" alt="$f(x)$" style="vertical-align:-4px; 
                                     width:32px; 
                                     height:18px" class="math gen" />, but find that this itself changed depending on the range of the <tt class="tt">x</tt>-axis. In this case, the user should have used the <tt class="tt">parametric</tt> plot option described in the next section. </p></div>





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