Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/repdiag.h

@@ -0,0 +1,54 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
+// 
+// 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 IGL_REPDIAG_H
+#define IGL_REPDIAG_H
+#include "igl_inline.h"
+
+#define EIGEN_YES_I_KNOW_SPARSE_MODULE_IS_NOT_STABLE_YET
+#include <Eigen/Dense>
+#include <Eigen/Sparse>
+
+namespace igl
+{
+  // REPDIAG repeat a matrix along the diagonal a certain number of times, so
+  // that if A is a m by n matrix and we want to repeat along the diagonal d
+  // times, we get a m*d by n*d matrix B such that:
+  // B( (k*m+1):(k*m+1+m-1), (k*n+1):(k*n+1+n-1)) = A 
+  // for k from 0 to d-1
+  //
+  // Inputs:
+  //   A  m by n matrix we are repeating along the diagonal. May be dense or
+  //     sparse
+  //   d  number of times to repeat A along the diagonal
+  // Outputs:
+  //   B  m*d by n*d matrix with A repeated d times along the diagonal,
+  //     will be dense or sparse to match A
+  //
+
+  // Sparse version
+  template <typename T>
+  IGL_INLINE void repdiag(
+    const Eigen::SparseMatrix<T>& A,
+    const int d,
+    Eigen::SparseMatrix<T>& B);
+  // Dense version
+  template <typename T>
+  IGL_INLINE void repdiag(
+    const Eigen::Matrix<T,Eigen::Dynamic,Eigen::Dynamic> & A,
+    const int d,
+    Eigen::Matrix<T,Eigen::Dynamic,Eigen::Dynamic> & B);
+  // Wrapper with B as output
+  template <class Mat>
+  IGL_INLINE Mat repdiag(const Mat & A, const int d);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "repdiag.cpp"
+#endif
+
+#endif