Squashed 'third_party/eigen/' content from commit 61d72f6
Change-Id: Iccc90fa0b55ab44037f018046d2fcffd90d9d025
git-subtree-dir: third_party/eigen
git-subtree-split: 61d72f6383cfa842868c53e30e087b0258177257
diff --git a/Eigen/src/SparseLU/SparseLU_Utils.h b/Eigen/src/SparseLU/SparseLU_Utils.h
new file mode 100644
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+++ b/Eigen/src/SparseLU/SparseLU_Utils.h
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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2012 Désiré Nuentsa-Wakam <desire.nuentsa_wakam@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+#ifndef EIGEN_SPARSELU_UTILS_H
+#define EIGEN_SPARSELU_UTILS_H
+
+namespace Eigen {
+namespace internal {
+
+/**
+ * \brief Count Nonzero elements in the factors
+ */
+template <typename Scalar, typename Index>
+void SparseLUImpl<Scalar,Index>::countnz(const Index n, Index& nnzL, Index& nnzU, GlobalLU_t& glu)
+{
+ nnzL = 0;
+ nnzU = (glu.xusub)(n);
+ Index nsuper = (glu.supno)(n);
+ Index jlen;
+ Index i, j, fsupc;
+ if (n <= 0 ) return;
+ // For each supernode
+ for (i = 0; i <= nsuper; i++)
+ {
+ fsupc = glu.xsup(i);
+ jlen = glu.xlsub(fsupc+1) - glu.xlsub(fsupc);
+
+ for (j = fsupc; j < glu.xsup(i+1); j++)
+ {
+ nnzL += jlen;
+ nnzU += j - fsupc + 1;
+ jlen--;
+ }
+ }
+}
+
+/**
+ * \brief Fix up the data storage lsub for L-subscripts.
+ *
+ * It removes the subscripts sets for structural pruning,
+ * and applies permutation to the remaining subscripts
+ *
+ */
+template <typename Scalar, typename Index>
+void SparseLUImpl<Scalar,Index>::fixupL(const Index n, const IndexVector& perm_r, GlobalLU_t& glu)
+{
+ Index fsupc, i, j, k, jstart;
+
+ Index nextl = 0;
+ Index nsuper = (glu.supno)(n);
+
+ // For each supernode
+ for (i = 0; i <= nsuper; i++)
+ {
+ fsupc = glu.xsup(i);
+ jstart = glu.xlsub(fsupc);
+ glu.xlsub(fsupc) = nextl;
+ for (j = jstart; j < glu.xlsub(fsupc + 1); j++)
+ {
+ glu.lsub(nextl) = perm_r(glu.lsub(j)); // Now indexed into P*A
+ nextl++;
+ }
+ for (k = fsupc+1; k < glu.xsup(i+1); k++)
+ glu.xlsub(k) = nextl; // other columns in supernode i
+ }
+
+ glu.xlsub(n) = nextl;
+}
+
+} // end namespace internal
+
+} // end namespace Eigen
+#endif // EIGEN_SPARSELU_UTILS_H