二元三节点拉格朗日插值函数源代码，用于二位数据插值和科学计算，适合学习matlab者参考。-Two yuan three-node Lagrange interpolation function source code for the two data interpolation and scientific computing for learning matlab reference.

分数延迟FIR滤波器的实现，分别使用了最小二乘法，拉格朗日插值法以及优化加权最小二乘法。-Fractional delay FIR filter implementation, using the least square method, the Lagrange interpolation method and optimization of weighted least squares.