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- <h4 class="subsection">D.4.4 Additional <code>glpk</code> notes</h4>
- <p>A sparse matrix representation of <var>m</var> is used because in practice
- <a name="index-sparse-matrix-716"></a>most linear programming problems have very sparse systems of equations.
- <p>Only the constraint of non-negativity is admitted. Other
- <a name="index-constraints-717"></a>constraints such as upper bounds must be effected through a change of
- variables if required.
- <p>The <code>glpk</code> library has a small memory leak, which <code>avram</code>
- corrects by methods described in <a href="Memory-leaks.html#Memory-leaks">Memory leaks</a>.
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