Eigen學習——Eigen Matrix刪除矩陣某一行或某一列

Talk is cheap, show you the code：

刪除矩陣某一行：

void RemoveRow(Eigen::Matrix3Xd& matrix, unsigned int rowToRemove) {
  unsigned int numRows = matrix.rows() - 1;
  unsigned int numCols = matrix.cols();

  if( rowToRemove < numRows ) {
    matrix.block(rowToRemove,0,numRows-rowToRemove,numCols) =
      matrix.block(rowToRemove+1,0,numRows-rowToRemove,numCols);
  }

  matrix.conservativeResize(numRows,numCols);
}

刪除矩陣某一列：

void RemoveColumn(Eigen::Matrix3Xd& matrix, unsigned int colToRemove) {
  unsigned int numRows = matrix.rows();
  unsigned int numCols = matrix.cols() - 1;

  if( colToRemove < numCols ) {
    matrix.block(0, colToRemove, numRows, numCols - colToRemove) =
      matrix.block(0, colToRemove + 1, numRows, numCols - colToRemove);
  }

  matrix.conservativeResize(numRows,numCols);
}

參考方法：鏈接