Function conservativeResize

include/Eigen/Eigen/src/SparseCore/SparseVector.h:272–281

Resizes the sparse vector to \a newSize, while leaving old values untouched. * * If the size of the vector is decreased, then the storage of the out-of bounds coefficients is kept and reserved. * Call .data().squeeze() to free extra memory. * * \sa reserve(), setZero() */

      * \sa reserve(), setZero()
      */
    void conservativeResize(Index newSize)
    {
      if (newSize < m_size)
      {
        Index i = 0;
        while (i<m_data.size() && m_data.index(i)<newSize) ++i;
        m_data.resize(i);
      }
      m_size = newSize;
    }

    void resizeNonZeros(Index size) { m_data.resize(size); }