PS_Method_CCS_test/Armadillo_example/fn_diagvec.cpp

// Copyright 2015 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2015 National ICT Australia (NICTA)
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------


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

using namespace arma;


TEST_CASE("fn_diagvec_1")
  {
  mat A = 
    "\
     0.061198   0.201990   0.019678  -0.493936  -0.126745;\
     0.437242   0.058956  -0.149362  -0.045465   0.296153;\
    -0.492474  -0.031309   0.314156   0.419733   0.068317;\
     0.336352   0.411541   0.458476  -0.393139  -0.135040;\
     0.239585  -0.428913  -0.406953  -0.291020  -0.353768;\
    ";
  
  vec A_main1 = diagvec(A);
  vec A_main2 = diagvec(A,0);
  
  vec A_p1 = diagvec(A, 1);
  vec A_m1 = diagvec(A,-1);
  
  vec a =
    {
     0.061198,
     0.058956,
     0.314156,
    -0.393139,
    -0.353768
    };
  
  vec b =
    {
     0.20199,
    -0.14936,
     0.41973,
    -0.13504
    };
  
  vec c =
    {
     0.437242,
    -0.031309,
     0.458476,
    -0.291020
    };
  
  REQUIRE( accu(abs(A_main1 - a)) == Approx(0.0) );
  REQUIRE( accu(abs(A_main2 - a)) == Approx(0.0) );
  
  REQUIRE( accu(abs(A_p1 - b)) == Approx(0.0) );
  REQUIRE( accu(abs(A_m1 - c)) == Approx(0.0) );
  }