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function y=f3(x,a)
T=[1 2 3];
[Tx,Ty]=size(T);
for i=1:Ty
    y(i)=T(i)*a*x;%»ñµÃÒ»¸ö¾ØÕó¡¾a*x, 2*a*x,3*a*x¡¿
end
------------------------------------
function y=f4(x,a)
T=[1 2 3];
[Tx,Ty]=size(T);
sum=0;
for i=1:Ty
    sum=sum+f3(x,a)(i);%Ä¿µÄÊǽ«f3(x,a)º¯ÊýµÃµ½µÄ¾ØÕóÖеÄÔªËØÇóºÍ£¬f3(x,a)(i)µÄÐÎʽ¶ÔÂð£¿
end
y=sum;
-------------------
function y=f5(x,a)
f=@(a) f4(x,a)£»
y=quad(f,0,1)£»%½«a*x+2*a*x+3*a*x=6*a*xÔÚ¡¾0£¬1¡¿É϶ÔaÇó»ý·ÖµÃµ½º¯Êý3*x£¬ÎªÁËÔÚģʽËÑËØ³ÌÐòÖÐÇó×îСֵ
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