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<title>libqalculate-0.9.7: Index</title>
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<h1>Index</h1>
<p>
<h2><a class="anchor" name="intro_sec">
Introduction</a></h2>
libqalculate is math libary for expression evaluation with units, variables and functions support and CAS functionality.<p>
The main parts of the library is the almighty <a class="el" href="classCalculator.html" title="The almighty calculator class.">Calculator</a> class, the <a class="el" href="classMathStructure.html" title="A structure representing a mathematical value/expression/result.">MathStructure</a> class for mathematical expressions and classes for objects in an epxression, mostly of the class Numbers and sub classes of <a class="el" href="classExpressionItem.html" title="Abstract base class for functions, variables and units.">ExpressionItem</a>.<p>
A simple application using libqalculate need only create a calculator object, perhaps load definitions (functions, variables, units, etc.) and use the calculate function as follows: <div class="fragment"><pre class="fragment"> <span class="keyword">new</span> <a class="code" href="classCalculator.html" title="The almighty calculator class.">Calculator</a>();
CALCULATOR->loadGlobalDefinitions();
CALCULATOR->loadLocalDefinitions();
<a class="code" href="structEvaluationOptions.html" title="Options for calculation.">EvaluationOptions</a> eo;
<a class="code" href="classMathStructure.html" title="A structure representing a mathematical value/expression/result.">MathStructure</a> result = CALCULATOR->calculate(<span class="stringliteral">"1 + 1"</span>, eo);
</pre></div><p>
More complex usage mainly involves manipulating objects of the <a class="el" href="classMathStructure.html" title="A structure representing a mathematical value/expression/result.">MathStructure</a> class directly.<p>
To display the resulting expression you will normally use MathStructure::format() followed by MathStructure::print() as follows: <div class="fragment"><pre class="fragment"> <a class="code" href="structPrintOptions.html" title="Options for formatting and display of mathematical structures/results.">PrintOptions</a> po;
result.<a class="code" href="classMathStructure.html#46583bfc7f4e37479fe6e8be076f57c2">format</a>(po);
<span class="keywordtype">string</span> result_str = result.<a class="code" href="classMathStructure.html#633a9c9a43a6e31653d0a970bd97a166">print</a>(po);
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Central to the flexiblity of libqalculate is the many options passed to evaluating and display functions with <a class="el" href="structEvaluationOptions.html" title="Options for calculation.">EvaluationOptions</a> and <a class="el" href="structPrintOptions.html" title="Options for formatting and display of mathematical structures/results.">PrintOptions</a>.<h2><a class="anchor" name="usage_sec">
Using the library</a></h2>
libqalculate uses pkg-config.<p>
For a simple program use pkg-config on the command line: <div class="fragment"><pre class="fragment"> c++ `pkg-config --cflags --libs libqalculate` hello.c -o hello
</pre></div><p>
If the program uses autoconf, put the following in configure.in: <div class="fragment"><pre class="fragment"> PKG_CHECK_MODULES(QALCULATE, [
libqalculate >= 0.9.7
])
AC_SUBST(QALCULATE_CFLAGS)
AC_SUBST(QALCULATE_LIBS)
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