Additional-minpack-notes.html 6.7 KB

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  57. <a name="Additional-minpack-notes-1"></a>
  58. <h3 class="subsection">D.13.3 Additional <code>minpack</code> notes</h3>
  59. <p>The <code>lm</code>* functions are better suited to problems in which the
  60. system function <var>f</var> has more outputs than inputs, and the
  61. <code>hybr</code>* functions are better suited to the alternative. If either
  62. is called when the other is more appropriate, the job is handed off to
  63. the other automatically.
  64. </p>
  65. <p>The <code>lmstr</code> function is more memory efficient than the others
  66. because it doesn&rsquo;t compute the whole Jacobian matrix at once. Any
  67. <a name="index-Jacobian-3"></a>
  68. of the <code>lm</code>* functions is more memory efficient than
  69. the <code>kinsol</code> equivalent when the output list is sufficiently
  70. longer than the input list.
  71. </p>
  72. <p>Unlike <code>kinsol</code>, there is no provision in <code>minpack</code> for
  73. <a name="index-constrained-optimization"></a>
  74. constrained optimization.
  75. </p>
  76. <p>The <code>minpack</code> documentation doesn&rsquo;t state whether it&rsquo;s
  77. <a name="index-re_002dentrancy"></a>
  78. re-entrant, but the odds are against it unless it uses no storage
  79. outside the user provided work areas. If it isn&rsquo;t re-entrant,
  80. anomalous effects could occur when a virtual code function being
  81. optimized calls another <code>minpack</code> function. A workaround would
  82. be to use an equivalent <code>kinsol</code> function, which is re-entrant by
  83. design.
  84. </p>
  85. <p>The <code>avram</code> configuration script searches for a C header file
  86. <a name="index-header-file-1"></a>
  87. &lsquo;<tt>minpack.h</tt>&rsquo; on the host system in order to build an interface to
  88. this library. This file is specific to the Debian <code>minpack-dev</code>
  89. package and is not part of the upstream Fortran source. Configuring
  90. <code>avram</code> with an interface to the <code>minpack</code> library on a
  91. <a name="index-Debian-1"></a>
  92. non-Debian system may require the administrator to retrieve the header
  93. file manually from the Debian archive and place it under
  94. &lsquo;<tt>/usr/include</tt>&rsquo; before running the configuration script (in
  95. addition to installing the <code>minpack</code> library itself, of course).
  96. </p>
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