matlab中的csapi函数是指三次样条插值函数。其使用格式：pp=csapi(x,y) %三次样条插值函数pp结构体，x，y是向量组，例如 values = csapi(x,y,xx) %即返回x x指定位置处的插值三次样条曲线的值。
This command is essentially the MATLAB® function spline, which, in turn, is a stripped-down version of the Fortran routine CUBSPL in PGS, except that csapi (and now also spline) accepts vector-valued data and can handle gridded data. exampleExamples...
关于Matlabn=input('\n 请输入分点数n: n='); x=-1:2/(n-1):1; fx=1./(1.+25.*x.^2); plot(x,fx,'ko');hold on; y=polyfit(x,fx,n-1); cs=csapi(x,fx); x=-1:0.01:1; yy=polyval(y,x); fx='1/(1+25*x^2)'; fnplt(cs,'m-');hold on;fplot(fx,[-1,1],'b...
For this reason, you have to be cautious when you are plotting values of such a bivariate spline with the aid of the MATLAB mesh function, as shown here: Get xf = linspace(x(1),x(end),41); yf = linspace(y(1),y(end),41); mesh(xf,yf,fnval(bcs,{xf,yf}).') Note the use...
For this reason, you have to be cautious when you are plotting values of such a bivariate spline with the aid of the MATLAB mesh function, as shown here: xf = linspace(x(1),x(end),41); yf = linspace(y(1),y(end),41); mesh(xf, yf, fnval( bcs, {xf, yf}).') Note the us...