diff armadillo-2.4.4/include/armadillo_bits/fn_sum.hpp @ 0:8b6102e2a9b0

Armadillo Library

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/armadillo-2.4.4/include/armadillo_bits/fn_sum.hpp	Wed Apr 11 09:27:06 2012 +0100
@@ -0,0 +1,152 @@
+// Copyright (C) 2008-2010 NICTA (www.nicta.com.au)
+// Copyright (C) 2008-2010 Conrad Sanderson
+// 
+// This file is part of the Armadillo C++ library.
+// It is provided without any warranty of fitness
+// for any purpose. You can redistribute this file
+// and/or modify it under the terms of the GNU
+// Lesser General Public License (LGPL) as published
+// by the Free Software Foundation, either version 3
+// of the License or (at your option) any later version.
+// (see http://www.opensource.org/licenses for more info)
+
+
+//! \addtogroup fn_sum
+//! @{
+
+
+//! \brief
+//! Delayed sum of elements of a matrix along a specified dimension (either rows or columns).
+//! The result is stored in a dense matrix that has either one column or one row.
+//! For dim = 0, find the sum of each column.
+//! For dim = 1, find the sum of each row.
+//! The default is dim = 0.
+//! NOTE: this function works differently than in Matlab/Octave.
+
+template<typename T1>
+arma_inline
+const Op<T1, op_sum>
+sum(const Base<typename T1::elem_type,T1>& X, const uword dim = 0)
+  {
+  arma_extra_debug_sigprint();
+  
+  return Op<T1, op_sum>(X.get_ref(), dim, 0);
+  }
+
+
+//! \brief
+//! Immediate 'sum all values' operation for a row vector
+template<typename eT>
+inline
+arma_warn_unused
+eT
+sum(const Row<eT>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return accu(X);
+  }
+
+
+
+//! \brief
+//! Immediate 'sum all values' operation for a column vector
+template<typename eT>
+inline
+arma_warn_unused
+eT
+sum(const Col<eT>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return accu(X);
+  }
+
+
+
+//! \brief
+//! Immediate 'sum all values' operation,
+//! invoked, for example, by: sum(sum(A))
+
+template<typename T1>
+inline
+arma_warn_unused
+typename T1::elem_type
+sum(const Op<T1, op_sum>& in)
+  {
+  arma_extra_debug_sigprint();
+  arma_extra_debug_print("sum(): two consecutive sum() calls detected");
+  
+  return accu(in.m);
+  }
+
+
+
+template<typename T1>
+arma_inline
+const Op<Op<T1, op_sum>, op_sum>
+sum(const Op<T1, op_sum>& in, const uword dim)
+  {
+  arma_extra_debug_sigprint();
+  
+  return Op<Op<T1, op_sum>, op_sum>(in, dim, 0);
+  }
+
+
+
+//! sum all values of a subview_row
+template<typename eT>
+inline
+arma_warn_unused
+eT
+sum(const subview_row<eT>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return accu(X);
+  }
+
+
+
+//! sum all values of a subview_col
+template<typename eT>
+inline
+arma_warn_unused
+eT
+sum(const subview_col<eT>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return accu(X);
+  }
+
+
+
+//! sum all values of a diagview
+template<typename eT>
+inline
+arma_warn_unused
+eT
+sum(const diagview<eT>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return accu(X);
+  }
+
+
+
+template<typename eT, typename T1>
+inline
+arma_warn_unused
+eT
+sum(const subview_elem1<eT,T1>& A)
+  {
+  arma_extra_debug_sigprint();
+  
+  return accu(A);
+  }
+
+
+
+//! @}