Method resize

include/Eigen/Eigen/src/SparseCore/SparseMatrix.h:739–754

Resizes the matrix to a \a rows x \a cols matrix and initializes it to zero. * * This function does not free the currently allocated memory. To release as much as memory as possible, * call \code mat.data().squeeze(); \endcode after resizing it. * * \sa reserve(), setZero() */

      * \sa reserve(), setZero()
      */
    void resize(Index rows, Index cols)
    {
      const Index outerSize = IsRowMajor ? rows : cols;
      m_innerSize = IsRowMajor ? cols : rows;
      m_data.clear();

      if ((m_outerIndex == 0) || (m_outerSize != outerSize)) {
        m_outerIndex = internal::conditional_aligned_realloc_new_auto<StorageIndex, true>(m_outerIndex, outerSize + 1, m_outerSize + 1);
        m_outerSize = outerSize;
      }

      internal::conditional_aligned_delete_auto<StorageIndex, true>(m_innerNonZeros, m_outerSize);
      m_innerNonZeros = 0;

      std::fill_n(m_outerIndex, m_outerSize + 1, StorageIndex(0));
    }

    /** \internal
      * Resize the nonzero vector to \a size */