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<div class="title">SparseLU_panel_dfs.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// This file is part of Eigen, a lightweight C++ template library</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// for linear algebra.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Copyright (C) 2012 Désiré Nuentsa-Wakam <desire.nuentsa_wakam@inria.fr></span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// This Source Code Form is subject to the terms of the Mozilla</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// Public License v. 2.0. If a copy of the MPL was not distributed</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">/* </span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> </span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * NOTE: This file is the modified version of [s,d,c,z]panel_dfs.c file in SuperLU </span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> </span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * -- SuperLU routine (version 2.0) --</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * Univ. of California Berkeley, Xerox Palo Alto Research Center,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * and Lawrence Berkeley National Lab.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * November 15, 1997</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * Copyright (c) 1994 by Xerox Corporation. All rights reserved.</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * Permission is hereby granted to use or copy this program for any</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * purpose, provided the above notices are retained on all copies.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * Permission to modify the code and to distribute modified code is</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * granted, provided the above notices are retained, and a notice that</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * the code was modified is included with the above copyright notice.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#ifndef SPARSELU_PANEL_DFS_H</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor"></span><span class="preprocessor">#define SPARSELU_PANEL_DFS_H</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">namespace </span>Eigen {</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">namespace </span>internal {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">template</span><<span class="keyword">typename</span> IndexVector></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">struct </span>panel_dfs_traits</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> {</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> IndexVector::Scalar Index;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  panel_dfs_traits(Index jcol, Index* marker)</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  : m_jcol(jcol), m_marker(marker)</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  {}</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">bool</span> update_segrep(Index krep, Index jj)</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  {</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">if</span>(m_marker[krep]<m_jcol)</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  m_marker[krep] = jj; </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  }</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">void</span> mem_expand(IndexVector& <span class="comment">/*glu.lsub*/</span>, Index <span class="comment">/*nextl*/</span>, Index <span class="comment">/*chmark*/</span>) {}</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">enum</span> { ExpandMem = <span class="keyword">false</span> };</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  Index m_jcol;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  Index* m_marker;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> };</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> Index></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Traits></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="keywordtype">void</span> SparseLUImpl<Scalar,Index>::dfs_kernel(<span class="keyword">const</span> Index jj, IndexVector& perm_r,</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  Index& nseg, IndexVector& panel_lsub, IndexVector& segrep,</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  Ref<IndexVector> repfnz_col, IndexVector& xprune, Ref<IndexVector> marker, IndexVector& parent,</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  IndexVector& xplore, GlobalLU_t& glu,</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  Index& nextl_col, Index krow, Traits& traits</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  )</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  Index kmark = marker(krow);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="comment">// For each unmarked krow of jj</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  marker(krow) = jj; </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  Index kperm = perm_r(krow); </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">if</span> (kperm == emptyIdxLU ) {</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// krow is in L : place it in structure of L(*, jj)</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  panel_lsub(nextl_col++) = krow; <span class="comment">// krow is indexed into A</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  traits.mem_expand(panel_lsub, nextl_col, kmark);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">else</span> </div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// krow is in U : if its supernode-representative krep</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">// has been explored, update repfnz(*)</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="comment">// krep = supernode representative of the current row</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  Index krep = glu.xsup(glu.supno(kperm)+1) - 1; </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">// First nonzero element in the current column:</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  Index myfnz = repfnz_col(krep); </div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">if</span> (myfnz != emptyIdxLU )</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// Representative visited before</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">if</span> (myfnz > kperm ) repfnz_col(krep) = kperm; </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  }</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">else</span> </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  {</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// Otherwise, perform dfs starting at krep</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  Index oldrep = emptyIdxLU; </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  parent(krep) = oldrep; </div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  repfnz_col(krep) = kperm; </div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  Index xdfs = glu.xlsub(krep); </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  Index maxdfs = xprune(krep); </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  Index kpar;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">do</span> </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// For each unmarked kchild of krep</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">while</span> (xdfs < maxdfs) </div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  {</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  Index kchild = glu.lsub(xdfs); </div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  xdfs++; </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  Index chmark = marker(kchild); </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">if</span> (chmark != jj ) </div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  {</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  marker(kchild) = jj; </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  Index chperm = perm_r(kchild); </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">if</span> (chperm == emptyIdxLU) </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// case kchild is in L: place it in L(*, j)</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  panel_lsub(nextl_col++) = kchild;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  traits.mem_expand(panel_lsub, nextl_col, chmark);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  }</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  {</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="comment">// case kchild is in U :</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">// chrep = its supernode-rep. If its rep has been explored, </span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="comment">// update its repfnz(*)</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  Index chrep = glu.xsup(glu.supno(chperm)+1) - 1; </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  myfnz = repfnz_col(chrep); </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  </div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">if</span> (myfnz != emptyIdxLU) </div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  { <span class="comment">// Visited before </span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">if</span> (myfnz > chperm) </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  repfnz_col(chrep) = chperm; </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  }</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">else</span> </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  { <span class="comment">// Cont. dfs at snode-rep of kchild</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  xplore(krep) = xdfs; </div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  oldrep = krep; </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  krep = chrep; <span class="comment">// Go deeper down G(L)</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  parent(krep) = oldrep; </div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  repfnz_col(krep) = chperm; </div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  xdfs = glu.xlsub(krep); </div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  maxdfs = xprune(krep); </div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  </div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  } <span class="comment">// end if myfnz != -1</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  } <span class="comment">// end if chperm == -1 </span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  </div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  } <span class="comment">// end if chmark !=jj</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  } <span class="comment">// end while xdfs < maxdfs</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="comment">// krow has no more unexplored nbrs :</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">// Place snode-rep krep in postorder DFS, if this </span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="comment">// segment is seen for the first time. (Note that </span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="comment">// "repfnz(krep)" may change later.)</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">// Baktrack dfs to its parent</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">if</span>(traits.update_segrep(krep,jj))</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="comment">//if (marker1(krep) < jcol )</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  {</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  segrep(nseg) = krep; </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  ++nseg; </div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="comment">//marker1(krep) = jj; </span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  }</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  </div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  kpar = parent(krep); <span class="comment">// Pop recursion, mimic recursion </span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">if</span> (kpar == emptyIdxLU) </div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">break</span>; <span class="comment">// dfs done </span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  krep = kpar; </div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  xdfs = xplore(krep); </div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  maxdfs = xprune(krep); </div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  } <span class="keywordflow">while</span> (kpar != emptyIdxLU); <span class="comment">// Do until empty stack </span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  </div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  } <span class="comment">// end if (myfnz = -1)</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  } <span class="comment">// end if (kperm == -1) </span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> }</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> Index></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="keywordtype">void</span> SparseLUImpl<Scalar,Index>::panel_dfs(<span class="keyword">const</span> Index m, <span class="keyword">const</span> Index w, <span class="keyword">const</span> Index jcol, MatrixType& A, IndexVector& perm_r, Index& nseg, ScalarVector& dense, IndexVector& panel_lsub, IndexVector& segrep, IndexVector& repfnz, IndexVector& xprune, IndexVector& marker, IndexVector& parent, IndexVector& xplore, GlobalLU_t& glu)</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> {</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  Index nextl_col; <span class="comment">// Next available position in panel_lsub[*,jj] </span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  </div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="comment">// Initialize pointers </span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  VectorBlock<IndexVector> marker1(marker, m, m); </div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  nseg = 0; </div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  </div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  panel_dfs_traits<IndexVector> traits(jcol, marker1.data());</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  </div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="comment">// For each column in the panel </span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordflow">for</span> (Index jj = jcol; jj < jcol + w; jj++) </div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  {</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  nextl_col = (jj - jcol) * m; </div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  </div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  VectorBlock<IndexVector> repfnz_col(repfnz, nextl_col, m); <span class="comment">// First nonzero location in each row</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  VectorBlock<ScalarVector> dense_col(dense,nextl_col, m); <span class="comment">// Accumulate a column vector here</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  </div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  </div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="comment">// For each nnz in A[*, jj] do depth first search</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">for</span> (<span class="keyword">typename</span> MatrixType::InnerIterator it(A, jj); it; ++it)</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  {</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  Index krow = it.row(); </div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  dense_col(krow) = it.value();</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  </div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  Index kmark = marker(krow); </div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">if</span> (kmark == jj) </div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordflow">continue</span>; <span class="comment">// krow visited before, go to the next nonzero</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  </div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  dfs_kernel(jj, perm_r, nseg, panel_lsub, segrep, repfnz_col, xprune, marker, parent,</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  xplore, glu, nextl_col, krow, traits);</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  }<span class="comment">// end for nonzeros in column jj</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  } <span class="comment">// end for column jj</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> }</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> </div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> } <span class="comment">// end namespace internal</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> } <span class="comment">// end namespace Eigen</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="preprocessor">#endif // SPARSELU_PANEL_DFS_H</span></div>
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