matlab 极坐标曲线拟合方程怎么求?答:;R = [320,321,341,375,420,450,460,466,474,468,466,466,466,466,466,466,466,461,443,420,400,383,360,337,320];plot(theta,R,'o');将数据标准化 theta1 = (theta-mean(theta))./std(theta);p=polyfit(theta1,R,8);pval=polyval(p,theta1);hold on;plot(theta,pval);...
利用MATLAB求解这样一个非线性自回归模型,y=ax^2+bx+c ,求系数a,b,c...答:x=[100 105 96 102] ;y=[105 96 102 101];fun=inline('a(1)*x^2+a(2)*x+a(3)','a','x');a=lsqcurvefit(fun,[1, 1, 1],x,y);c=a(3),b=a(2),a=a(1)c = -2.2001e+003 >> b=a(2)b = 46.5663 >> a=a(1)a = -0.2353 ...