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<b class="current">2012 Aug 1: Pyxplot 0.9.0</b>
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<div><h2 id="a0000000279">2012 Aug 1: Pyxplot 0.9.0</h2>
<p>Version 0.9 is a major update. Many new data types have been introduced, each of which has methods which can be called in an object-orientated fashion. These include: </p><ul class="itemize">
<li><p><b class="bf">Colors</b>, which can be stored in variables for subsequent use in vector graphics commands. The addition and subtraction operators act on colors to allow color mixing. </p></li><li><p><b class="bf">Dates</b>, which can be imported from calendar dates, unix times or Julian dates. Dates can be subtracted to give time intervals. </p></li><li><p><b class="bf">Lists</b> and <b class="bf">dictionaries</b>, which can be iterated over, or used to feed calculated data into the <tt class="tt">plot</tt> and <tt class="tt">tabulate</tt> commands. </p></li><li><p><b class="bf">Vectors</b> and <b class="bf">matrices</b>, which allow matrix algebra. These types interface cleanly with Pyxplot’s vector-graphics commands, allowing positions to be specified as vector expressions. </p></li><li><p><b class="bf">File handles</b>, which allow Pyxplot to read data from files, or write data or logs to files. </p></li><li><p><b class="bf">Modules</b> and <b class="bf">classes</b>, which allow object-orientated programming. </p></li>
</ul><p>In addition, Pyxplot’s range of operators has been extended to include most of those in the C programming language, allowing expressions such as </p><p> <tt class="ttfamily">pyxplot> <b class="bfseries">print (a=3)+(b=2)</b></tt><br /><tt class="ttfamily">5</tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries">print a<img src="images/img-0035.png" alt="$>$" style="vertical-align:0px;
width:12px;
height:11px" class="math gen" />0?"yes":"no"</b></tt><br /><tt class="ttfamily">yes</tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries">print "%s %s"%(++a,b++)</b></tt><br /><tt class="ttfamily">4 2</tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries">print (a+=10 , b+=10 , a+b)</b></tt><br /><tt class="ttfamily">27</tt> </p><p>to be written. </p><h3 id="a0000001831">Incompatibilities with Pyxplot 0.8</h3>
<p>The extensions to Pyxplot in version 0.9 mean that some minor changes to syntax have been necessary. These include: </p><ul class="itemize">
<li><p>Some functions and variables have been renamed. Variables whose names used to begin <tt class="tt">phy_</tt> now live in a module called <tt class="tt">phy</tt>. They may be accessed as, for example, <tt class="tt">phy.c</tt>. Similarly, random number generating functions now live in a module called <tt class="tt">random</tt>; statistics functions in a module called <tt class="tt">stats</tt>; time-handling functions in <tt class="tt">time</tt>; operating system functions in <tt class="tt">os</tt>; and astronomy functions in <tt class="tt">ast</tt>. The contents of these modules can be listed by typing, for example, <tt class="tt">print phy</tt>. </p></li><li><p>Custom colors, which used to be specified using syntax such as <tt class="tt">rgb0.2:0.3:0.4</tt>, should now be specified using the <tt class="tt">rgb(r,g,b)</tt> functions, as, for example, <tt class="tt">rgb(0.2,0.3,0.4)</tt>. Custom colors can now be stored in variables for later use (see Section <a href="sec-colorObjects.html">6.6</a>). </p></li><li><p>The range of escape characters which can be used in strings has been increased, so that, for example, <tt class="tt"><img src="images/img-0038.png" alt="$\backslash $" style="vertical-align:-5px;
width:7px;
height:18px" class="math gen" />n</tt> is a newline and <tt class="tt"><img src="images/img-0038.png" alt="$\backslash $" style="vertical-align:-5px;
width:7px;
height:18px" class="math gen" />t</tt> a tab. As in python, prepending the string with the character <tt class="tt">r</tt> disables all escape character expansion. As backslashes are common characters in latex command strings, the easiest approach is to always prepend latex strings with an <tt class="tt">r</tt>. As in python, triple quotes, e.g. <tt class="tt">r"""2 <img src="images/img-0038.png" alt="$\backslash $" style="vertical-align:-5px;
width:7px;
height:18px" class="math gen" />times 3"""</tt> can be used where required (see Section <a href="sec-latex_incompatibility.html">3.6</a>). </p></li><li><p>In the <tt class="tt">foreach</tt> command, square brackets should be used to delimit lists of items to iterate over. The Pyxplot 0.8 syntax <tt class="tt">foreach i in (1,2,3)</tt> should now be written <tt class="tt">foreach i in [1,2,3]</tt> (see Section <a></a>). </p></li>
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