一种流形学习算法，用于非线性降维，文章发表在2000年science杂志上，是一种非常经典的算法。-A manifold learning algorithm for nonlinear dimensionality reduction, articles published in science journal in 2000, is a very classic algorithms.

八叉树算法代码。八叉树算法在减少数值计算空间的应用广泛。在美国SEG等顶尖地球物理杂志上已经发表过相关文章-Octree algorithm code. Octree algorithm in reducing numerical calculation of the space wide application. In the United States such as SEG top geophysical magazine published related articles

面波射线追踪。基于Boschi 和 Woodhouse 2006年发表在GJI上的文章中的方法。更详细的介绍见英文描述。对于做波场模拟的同学很有参考价值。 -surface wave ray tracing as described by Boschi and Woodhouse GJI 2006 Authors: Lapo Boschi General: Wave propagation Code level: Research Language: Fortran