a real diagonal matrix实对角矩阵
real alternating matrix[数] 实交错矩阵
real square matrix实方阵
real symmetric matrix[数] 实对称矩阵
real symmetrical matrix实对称矩阵
especial real-matrix特殊实矩阵
real diagonal matrix实对角矩阵
real symmetry matrix实对称矩阵
real positive matrix实正定矩阵