逼近函数

yaoyuan4102

function f = Legendre(y,k,x0)
5 o5 P6 G/ u4 [, rsyms t;
: B6 J) i4 I7 tP(1:k+1) = t;
6 m  Z( e" d" X* f. ZP(1) = 1;
6 J- f" R1 z" t( f5 g; q: NP(2) = t;
c(1:k+1) = 0.0;
c(1)=int(subs(y,findsym(sym(y)),sym('t'))*P(1),t,-1,1)/2;
c(2)=int(subs(y,findsym(sym(y)),sym('t'))*P(2),t,-1,1)/2;
f = c(1)+c(2)*t;
for i=3:k+1
) A! Y! ~  N# o. X    P(i) = ((2*i-3)*P(i-1)*t-(i-2)*P(i-2))/(i-1);
    c(i) = int(subs(y,findsym(sym(y)),t)*P(i),t,-1,1)/2;
7 G' V$ a, u% Y) }    f = f + c(i)*P(i);
   
2 q$ k3 `8 l9 q; g1 f5 ]' b    if(i==k+1)
        if(nargin == 3)
            f = subs(f,'t',x0);
        else
            f = vpa(f,6);
        end
    end
end

Kadyniost

？？？？？

coolistone

顶顶顶顶顶顶顶顶顶顶顶顶的

hjl19890710

lihan厉害厉害厉害厉害厉害

hjl19890710

好 dwadedcsargtg

昝斌

这是什么哦？

zqyzixin

呵呵，非常感谢，很好很强大