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<h4 class="subsection">D.13.3 Additional <code>minpack</code> notes</h4>

<p>The <code>lm</code>* functions are better suited to problems in which the
system function <var>f</var> has more outputs than inputs, and the
<code>hybr</code>* functions are better suited to the alternative. If either
is called when the other is more appropriate, the job is handed off to
the other automatically.

   <p>The <code>lmstr</code> function is more memory efficient than the others
because it doesn't compute the whole Jacobian matrix at once. Any
<a name="index-Jacobian-787"></a>of the <code>lm</code>* functions is more memory efficient than
the <code>kinsol</code> equivalent when the output list is sufficiently
longer than the input list.

   <p>Unlike <code>kinsol</code>, there is no provision in <code>minpack</code> for
<a name="index-constrained-optimization-788"></a>constrained optimization.

   <p>The <code>minpack</code> documentation doesn't state whether it's
<a name="index-re_002dentrancy-789"></a>re-entrant, but the odds are against it unless it uses no storage
outside the user provided work areas. If it isn't re-entrant,
anomalous effects could occur when a virtual code function being
optimized calls another <code>minpack</code> function.  A workaround would
be to use an equivalent <code>kinsol</code> function, which is re-entrant by
design.

   <p>The <code>avram</code> configuration script searches for a C header file
<a name="index-header-file-790"></a><samp><span class="file">minpack.h</span></samp> on the host system in order to build an interface to
this library. This file is specific to the Debian <code>minpack-dev</code>
package and is not part of the upstream Fortran source. Configuring
<code>avram</code> with an interface to the <code>minpack</code> library on a
<a name="index-Debian-791"></a>non-Debian system may require the administrator to retrieve the header
file manually from the Debian archive and place it under
<samp><span class="file">/usr/include</span></samp> before running the configuration script (in
addition to installing the <code>minpack</code> library itself, of course).

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