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<h3 class="section">D.4 <code>glpk</code></h3>

<p>The <code>glpk</code> library (<a href="ftp://ftp.gnu.org/pub/gnu/glpk/">ftp://ftp.gnu.org/pub/gnu/glpk/</a>) solves
linear programming problems by the either the simplex algorithm or
<a name="index-linear-programming-714"></a>an interior point method.

   <p>The API for C client programs involves a complicated protocol with
many optional settings, which is simplified for the virtual machine
interface. Specifically, the library gives a choice of only two
functions, which can be expressed in the following forms.

<pre class="example">     library('glpk','simplex')
     
     library('glpk','interior')
</pre>
   <p class="noindent">These functions have the same calling convention and should return
generally the same output for identical inputs, but differences in
performance, precision, and maybe correctness can be expected. 
The remainder of this section applies to both of them.

<ul class="menu">
<li><a accesskey="1" href="glpk-input-parameters.html#glpk-input-parameters">glpk input parameters</a>
<li><a accesskey="2" href="glpk-output.html#glpk-output">glpk output</a>
<li><a accesskey="3" href="glpk-errors.html#glpk-errors">glpk errors</a>
<li><a accesskey="4" href="Additional-glpk-notes.html#Additional-glpk-notes">Additional glpk notes</a>
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