在线性代数中，一个的矩阵的迹（或迹数），是指的主对角线（从左上方至右下方的对角线）上各个元素的总和，一般记作或： 其中代表矩阵的第i行j列上的元素的值。一个矩阵的迹是其特征值的总和（按代数重数计算）。 迹的英文为trace，是来自德文中的Spur这个单字（与英文中的Spoor是同源词），在数学中，通常简写为“Sp”或“tr”
对自由振动圆柱后尾迹中的湍流普朗特数进行了实验研究，并与刚性柱体尾迹的结果作了比较。
Turbulent Prandtl number of wakes generated by a free vibrating cylinder were investigated experimentally, and results were compared with those of rigid cylinder wakes.
定义了四元数矩阵的范数，并利用范数的性质，建立了几个四元数矩阵之迹的不等式。
The definition of norm of quaternion matrices is given, and several inequalities on the traces of quaternion matrices are proved by using properties on the norm of quaternion matrices.
证明了几个与四元数矩阵迹有关的弱控制不等式，推广、改进了有关文献的相应结果。
Several weakly controled inequalities with relation to trace of quaternions matrices are proved, and relevant results in some references are generalized and improved.
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