return value of the iterator

\returns the number of rows */

\brief Give the number of columns. */

\returns a vector expression of the \a i -th column, * only the meaningful part is returned. * \warning the internal storage must be column majo

\returns the stored value at index \a key * If the value does not exist, then the value \a defaultValue is returned without any insertion. */

! @brief get next character from the input This function provides the interface to the used input adapter. It does not throw in case the

\returns the value of the current coefficient.

\returns the row index of the current coefficient.

Insert a point into kd-tree @note external point-buffer is used to reduce kd-tree's memory footprint @param iPoint index of point in external point-bu

\returns a const pointer to the array of the starting positions of the inner vectors. * This function is aimed at interoperability with other libra

return iterator end (needed for range-based for)

@brief returns the number of elements @sa https://json.nlohmann.me/api/basic_json/size/

Gets value of node. Interpretation of value depends on type of node. Note that value will not be zero-terminated if rapidxml::parse_no_string_terminat

\returns the value of the matrix at position \a i, \a j * This function returns Scalar(0) if the element is an explicit \em zero */