本文整理汇总了C++中ivector::begin方法的典型用法代码示例。如果您正苦于以下问题：C++ ivector::begin方法的具体用法？C++ ivector::begin怎么用？C++ ivector::begin使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ivector的用法示例。
在下文中一共展示了ivector::begin方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: tmp
inline void hom8DofHelper<T,U>::initialize(const matrix<tpoint<U> >& src,
const ivector& indices,
const int numCorrespondences,
vector<T>& AtA11,
matrix<T>& AtA31,
matrix<T>& AtA32,
vector<T>& AtA33,
vector<T>& dest) const {
//------ least squares problem: A * dest = b
//---------------------------------------------------
//references for fast access of the vector's elements
//---------------------------------------------------
//----------------
//A_transponed * b
//----------------
dest.resize(8, T(0), false, true);
typename vector<T>::iterator vit ( dest.begin() );
T& d0 = *vit;
T& d1 = *(++vit);
T& d2 = *(++vit);
T& d3 = *(++vit);
T& d4 = *(++vit);
T& d5 = *(++vit);
T& d6 = *(++vit);
T& d7 = *(++vit);
//-------------
//submatrix 1.1, 3x3, symectric, only triagonal part is computed
//-------------
AtA11.resize ( 6, T(0), false, true );
vit = AtA11.begin();
T& a11_0 = *vit;
T& a11_1 = *(++vit);
T& a11_2 = *(++vit);
T& a11_3 = *(++vit);
T& a11_4 = *(++vit);
*(++vit) = static_cast<T>(src.columns());
//-------------
//submatrix 3.1, 2x3
//-------------
AtA31.resize ( 2, 3, T(0), false, true );
typename matrix<T>::iterator mit ( AtA31.begin() );
T& a31_0 = *mit;
T& a31_1 = *(++mit);
T& a31_2 = *(++mit);
T& a31_3 = *(++mit);
T& a31_4 = *(++mit);
T& a31_5 = *(++mit);
//-------------
//submatrix 3.2, 2x3
//-------------
AtA32.resize( 2, 3, T(0), false, true );
mit = AtA32.begin();
T& a32_0 = *mit;
T& a32_1 = *(++mit);
T& a32_2 = *(++mit);
T& a32_3 = *(++mit);
T& a32_4 = *(++mit);
T& a32_5 = *(++mit);
//-------------
//submatrix 3.3, 2x2
//-------------
AtA33.resize( 3, T(0), false, true );
vit = AtA33.begin();
T& a33_0 = *vit;
T& a33_1 = *(++vit);
T& a33_2 = *(++vit);
//--------------------
//init all submatrices
//--------------------
const vector<tpoint<U> >& pts1 = src.getRow(0);
const vector<tpoint<U> >& pts2 = src.getRow(1);
typename ivector::const_iterator it ( indices.begin() );
typename ivector::const_iterator end ( it + numCorrespondences );
for (; it!=end; ++it) {
const tpoint<U>& pt1 = pts1.at(*it);
const T x1 ( static_cast<T>(pt1.x) );
const T y1 ( static_cast<T>(pt1.y) );
const T sqX1 ( x1*x1 );
const T sqY1 ( y1*y1 );
const T x1Y1 ( x1*y1 );
a11_0 += sqX1;
a11_1 += x1Y1;
a11_2 += x1;
a11_3 += sqY1;
a11_4 += y1;
const tpoint<U>& pt2 = pts2.at(*it);
const T x2 ( static_cast<T>(pt2.x) );
const T y2 ( static_cast<T>(pt2.y) );
a31_0 -= sqX1 * x2;
a31_1 -= x1Y1 * x2;
a31_2 -= x1 * x2;
a31_4 -= sqY1 * x2;
//.........这里部分代码省略.........