在一个n阶方阵(或是n阶行列式)中，从左上角到右下角这一斜线上的n 个元素的位置，叫做n 阶方阵(或行列式)的主对角线。
然后构造了在预给极点情况下求主对角线和副对角线上向量值有理插值的矩阵算法。
In addition this paper constructs a matrix algorithm for computing bivariate diagonal vector valued rational interpolants with preassigned poles.
我们取特殊的矩阵结构，矩阵每行，每列都有一个矩阵元，并且矩阵元位置是关于主对角线对称的。
A special matrix structure was adopted, that is, each row and each column has one matrix element, and the matrix elements are on the main diagonal symmetry.
安装前要对起重机安装跨度，金属结构主梁的拱度、水平旁弯，小车轨道高低差、轨距偏差，桥架对角线等进行测量。
To install the crane span before installation, camber, level of metal structure of main girder bending, trolley rail height difference, gauge deviation, diagonal bridge survey.
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