Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/count.h

@@ -0,0 +1,46 @@
+// 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_COUNT_H
+#define IGL_COUNT_H
+#include "igl_inline.h"
+#include <Eigen/Sparse>
+
+namespace igl
+{
+  // Note: If your looking for dense matrix matlab like sum for eigen matrics
+  // just use:
+  //   M.colwise().count() or M.rowwise().count()
+  // 
+
+  // Count the number of non-zeros in the columns or rows of a sparse matrix
+  //
+  // Inputs:
+  //   X  m by n sparse matrix
+  //   dim  dimension along which to sum (1 or 2)
+  // Output:
+  //   S  n-long sparse vector (if dim == 1) 
+  //   or
+  //   S  m-long sparse vector (if dim == 2)
+  template <typename XType, typename SType>
+  IGL_INLINE void count(
+    const Eigen::SparseMatrix<XType>& X, 
+    const int dim,
+    Eigen::SparseVector<SType>& S);
+  template <typename XType, typename DerivedS>
+  IGL_INLINE void count(
+    const Eigen::SparseMatrix<XType>& X, 
+    const int dim,
+    Eigen::PlainObjectBase<DerivedS>& S);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "count.cpp"
+#endif
+
+#endif
+