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- <a name="Additional-gslint-notes"></a>
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- <h3 class="subsection">D.7.4 Additional <code>gslint</code> notes</h3>
- <p>The <code>qagx</code>* functions subsume the GSL variants <code>qags</code>,
- <code>qagiu</code>, <code>qagil</code>, and <code>qagi</code> for finite, semi-infinite,
- and infinite intervals, which are seleted as appropriate based on the
- <a name="index-improper-integrals"></a>
- limits of integration <var>a</var> and <var>b</var>.
- </p>
- <p>The <code>qagp</code> function reverts to the <code>qagx</code> function if there
- are only two points given in <var>p</var>. Fewer than two will cause an
- error.
- </p>
- <p>The library interface code relies on the standard <code>setjmp</code>
- <a name="index-setjmp-1"></a>
- utility found in the system header file <code>setjmp.h</code> to break out
- of integrals that don’t converge after excessively many function
- evaluations. Non-termination has been an issue in the past with GSL
- integration routines for very badly behaved integrands, and the API
- provides no documented means for the user supplied integrand function
- to request a halt.
- </p>
- <p>Although it is meant to be standard, a host without <code>setjmp</code> will
- cause <code>avram</code> to be configured to abort the application with an
- error message in the event of non-convergence. This behavior is
- considered preferable to the alternative of non-termination. Usually
- an effective workaround in such cases is to specify a sufficiently
- loose tolerance explicitly by using one of the *<code>_tol</code> library
- functions.
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