// Copyright (C) 2015 National ICT Australia (NICTA)
// 
// 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/.
// -------------------------------------------------------------------
// 
// Written by Conrad Sanderson - http://conradsanderson.id.au


#include <armadillo>
#include "catch.hpp"

using namespace arma;


TEST_CASE("fn_cumsum_1")
  {
  colvec a = linspace<colvec>(1,5,6);
  rowvec b = linspace<rowvec>(1,5,6);
  
  colvec c = { 1.0000, 2.8000, 5.4000, 8.8000, 13.0000, 18.0000 };
  
  REQUIRE( accu(abs(cumsum(a) - c    )) == Approx(0.0) );
  REQUIRE( accu(abs(cumsum(b) - c.t())) == Approx(0.0) );
  
  REQUIRE_THROWS( b = cumsum(a) );
  }



TEST_CASE("fn_cumsum_2")
  {
  mat A =
    {
    { -0.78838,  0.69298,  0.41084,  0.90142 },
    {  0.49345, -0.12020,  0.78987,  0.53124 },
    {  0.73573,  0.52104, -0.22263,  0.40163 }
    };
  
  mat B =
    {
    { -0.78838,  0.69298,  0.41084,  0.90142 },
    { -0.29493,  0.57278,  1.20071,  1.43266 },
    {  0.44080,  1.09382,  0.97808,  1.83429 }
    };
  
  mat C =
    {
    {-0.78838, -0.09540,  0.31544,  1.21686 },
    { 0.49345,  0.37325,  1.16312,  1.69436 },
    { 0.73573,  1.25677,  1.03414,  1.43577 }
    };
  
  REQUIRE( accu(abs(cumsum(A)   - B)) == Approx(0.0) );
  REQUIRE( accu(abs(cumsum(A,0) - B)) == Approx(0.0) );
  REQUIRE( accu(abs(cumsum(A,1) - C)) == Approx(0.0) );
  }



