Question

我想把一条曲线回归成函数 请问有什么好软件么?

Answer 1

数学问题就应该用Matlab下面有代码和图像x=[0,50,100,150,200,250,300,350,400,450,500,550,600];y=[1094,1100,1088,1076,1058,1023,976,895,782,638,464,282,111];>> [P,I]=polyfit(x,y,4);>> x1=0:1:600;>> y1=polyval(P,x1);>> plot(x1,y1,x,y,'*')>> title(['y=' num2str(P(1)) 'x^4+' num2str(P(2)) 'x^3+' num2str(P(3)) 'x^2+' num2str(P(4)) 'x+' num2str(P(5))]);>> format long>> PP =1.0e+003 *0.000000000015784-0.0000000215534070.000005336312217-0.0005146723374661.101936974789915四次多项式的的每项系数就是P的元看图片就更明白了.若满意请采纳 ^.^