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<a name="Additional-minpack-notes"></a>
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<a name="Additional-minpack-notes-1"></a>
<h3 class="subsection">D.13.3 Additional <code>minpack</code> notes</h3>

<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>
<p>The <code>lmstr</code> function is more memory efficient than the others
because it doesn&rsquo;t compute the whole Jacobian matrix at once. Any
<a name="index-Jacobian-3"></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>
<p>Unlike <code>kinsol</code>, there is no provision in <code>minpack</code> for
<a name="index-constrained-optimization"></a>
constrained optimization.
</p>
<p>The <code>minpack</code> documentation doesn&rsquo;t state whether it&rsquo;s
<a name="index-re_002dentrancy"></a>
re-entrant, but the odds are against it unless it uses no storage
outside the user provided work areas. If it isn&rsquo;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>
<p>The <code>avram</code> configuration script searches for a C header file
<a name="index-header-file-1"></a>
&lsquo;<tt>minpack.h</tt>&rsquo; 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-1"></a>
non-Debian system may require the administrator to retrieve the header
file manually from the Debian archive and place it under
&lsquo;<tt>/usr/include</tt>&rsquo; before running the configuration script (in
addition to installing the <code>minpack</code> library itself, of course).
</p>
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