legend('Sample Points','pchip','spline','Location','SouthEast') In this case, pchip is favorable since it does not oscillate as freely between the sample points. Perform a second comparison using an oscillatory sample function. x = 0:25; y = besselj(1,x); xq2 = 0:0.01:25; p = pc...
legend('Sample Points','pchip','spline','Location','SouthEast') In this case, pchip is favorable since it does not oscillate as freely between the sample points. Perform a second comparison using an oscillatory sample function. x = 0:25; y = besselj(1,x); xq2 = 0:0.01:25; p = pc...
这样所有的 u\in[u_{min},u_{max}] 都会被分到一个有长度的区间。前后n个区间不会被分配。 至此,所有相关理论介绍完毕,下面来看实现: classdef BSpline < handle properties CVs nCV umin umax knots order end methods (Access = protected) function idx = span_index(this,u) if u == this.umax ...
spmak(1:6,0:2)constructs a spline function with basic interval [1. .6], with 6 knots and 3 coefficients, hence of order 6 - 3 = 3. spmak(t,1)provides the B-splineB(·|t) in B-form. The coefficients may bed-vectors (e.g., 2-vectors or 3-vectors), in which case the resu...
spline是样条，是一种分段光滑的多项式，MATLAB里面spline函数是三次样条插值，也就是用分段光滑的曲线去插值，每一段都是三次多项式。要知道原理的话得找本书好好看看，虽然不难但也不是几句话就能讲清楚的。参考
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The 3rd input argument of the "spline" function can be used to evaluate specific query points: https://www.mathworks.com/help/matlab/ref/spline.html#bvjdpi3-xq 댓글 수: 0 댓글을 달려면 로그인하십시오.
In other words, for the coefficients [a,b,c,d] on the interval [x1,x2], the corresponding polynomial is f(x)=a(x−x1)3+b(x−x1)2+c(x−x1)+d .Tips You also can perform spline interpolation using the interp1 function with the command interp1(x,y,xq,'spline'). While ...
三、北太天元 or matlab实现 Ⅰ型 function [s,M] = spline1_interp(x0,y0,df0,dfn,x) % I型三次样条插值 % Input: 节点向量x0,y0,两个端点的一阶导 df0,df1 % 目标点 x % Output: 插值结果 s , M % 子函数:divided_differences,tridiag_chase % Version: 1.0 % last modified: 04/14/202...
节点 ，用三次样条插值求 及在某些点处的近似值.MATLAB实现:yi=interp1(x,y,xi) %根据数据(x,y)给出分段线性插值函数的xi的值yi.yi=interp1(x,y,xi,’spline’) %使用三次样条插值.yi=interp1(x,y,xi,’cubic’) %使用分段三次插值.Yi=spline(x,y,xi) %同yi=interp1(x,y,xi,’spline’)