How to determine if a point lies on the diagonal of a square?
如何确定一个点在一个正方形的对角线？
Floating point representation, Gaussian elimination with partial pivoting, scaling of computations with matrix size, banded and tri-diagonal systems, LU decomposition.
浮点数表示法，含部份换轴之高斯消去法，使用矩阵大小之计算尺度调整，带状及三角对角系统，LU分解。
A new kind of method to put the theodolite on the crossing point of axes directly and use diagonal ocular to ca.
作者提出用经纬仪直接置于轴线交点上，利用弯管目镜垂直投点到各层轴线交点上。
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