Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/nchoosek.h

@@ -0,0 +1,46 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+//
+// Copyright (C) 2015 Olga Diamanti, Alec Jacobson
+//
+// 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_NCHOOSEK
+#define IGL_NCHOOSEK
+#include "igl_inline.h"
+#include "deprecated.h"
+#include <vector>
+
+#include <Eigen/Core>
+
+namespace igl 
+{
+  // NCHOOSEK  Like matlab's nchoosek.
+  //
+  // Inputs:
+  //   n  total number elements
+  //   k  size of sub-set to consider
+  // Returns number of k-size combinations out of the set [1,...,n]
+  IGL_INLINE double nchoosek(const int n, const int k);
+  // 
+  // Inputs:
+  //   V  n-long vector of elements
+  //   k  size of sub-set to consider
+  // Outputs:
+  //   U  nchoosek by k long matrix where each row is a unique k-size
+  //     combination
+  template < typename DerivedV, typename DerivedU>
+  IGL_INLINE void nchoosek(
+    const Eigen::MatrixBase<DerivedV> & V,
+    const int k,
+    Eigen::PlainObjectBase<DerivedU> & U);
+}
+
+
+#ifndef IGL_STATIC_LIBRARY
+#include "nchoosek.cpp"
+#endif
+
+
+#endif /* defined(IGL_NCHOOSEK) */