哪位大神帮我看看这条matlab程序错在哪里?clearr=0.3894;n5_min=1200;n5_max=4400;n5=[n5_min:200:n5_max];Te=xlsread('uamax-Te.xls');i0=5.286;ig5=1;eta=0.81;m=4290;G=m*9.8;Cd=0.65;A=6.406;f=0.015;ua5=0.377*r.*n5/ig5/i0;Ft5=Te*i0*ig5
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![哪位大神帮我看看这条matlab程序错在哪里?clearr=0.3894;n5_min=1200;n5_max=4400;n5=[n5_min:200:n5_max];Te=xlsread('uamax-Te.xls');i0=5.286;ig5=1;eta=0.81;m=4290;G=m*9.8;Cd=0.65;A=6.406;f=0.015;ua5=0.377*r.*n5/ig5/i0;Ft5=Te*i0*ig5](/uploads/image/z/1340343-63-3.jpg?t=%E5%93%AA%E4%BD%8D%E5%A4%A7%E7%A5%9E%E5%B8%AE%E6%88%91%E7%9C%8B%E7%9C%8B%E8%BF%99%E6%9D%A1matlab%E7%A8%8B%E5%BA%8F%E9%94%99%E5%9C%A8%E5%93%AA%E9%87%8C%3Fclearr%3D0.3894%3Bn5_min%3D1200%3Bn5_max%3D4400%3Bn5%3D%5Bn5_min%3A200%3An5_max%5D%3BTe%3Dxlsread%28%26%2339%3Buamax-Te.xls%26%2339%3B%29%3Bi0%3D5.286%3Big5%3D1%3Beta%3D0.81%3Bm%3D4290%3BG%3Dm%2A9.8%3BCd%3D0.65%3BA%3D6.406%3Bf%3D0.015%3Bua5%3D0.377%2Ar.%2An5%2Fig5%2Fi0%3BFt5%3DTe%2Ai0%2Aig5)
哪位大神帮我看看这条matlab程序错在哪里?clearr=0.3894;n5_min=1200;n5_max=4400;n5=[n5_min:200:n5_max];Te=xlsread('uamax-Te.xls');i0=5.286;ig5=1;eta=0.81;m=4290;G=m*9.8;Cd=0.65;A=6.406;f=0.015;ua5=0.377*r.*n5/ig5/i0;Ft5=Te*i0*ig5
哪位大神帮我看看这条matlab程序错在哪里?
clear
r=0.3894;
n5_min=1200;
n5_max=4400;
n5=[n5_min:200:n5_max];
Te=xlsread('uamax-Te.xls');
i0=5.286;
ig5=1;
eta=0.81;
m=4290;
G=m*9.8;
Cd=0.65;
A=6.406;
f=0.015;
ua5=0.377*r.*n5/ig5/i0;
Ft5=Te*i0*ig5*eta/r;
plot(ua5,Ft5);
hold on;
B=polyfit(Ft5,ua5,5);
disp('拟合多项式系数')
fprintf(1,'%.17f\n',B)
ua5=0.377*r.*n5/ig5/i0;
Fw=Cd.*A.*ua5.^2/21.15;
Ff=f*G;
Fz5=Fw+Ff;
plot(ua5,Fz5,'r-');
C=polyfit(Fz5,ua5,5);
disp('拟合多项式系数')
fprintf(1,'%.17f\n',C)
ua=80:0.1:90;
Ft=B(1,1)+B(1,2)*ua+B(1,3)*ua.^2+B(1,4)*ua.^3+B(1,5)*ua.^4+B(1,6)*ua.^5;
Fz=C(1,1)+C(1,2)*ua+C(1,3)*ua.^2+C(1,4)*ua.^3+C(1,5)*ua.^4+C(1,6)*ua.^5;
solve('Fz-Ft','ua')
最后运行结果,图可以出来,多项式系数可以拟合出来,唯独最后的solve函数无解……如下图:
这是什么原因啊?图线上明明在80~90的范围内有交点的.
哪位大神帮我看看这条matlab程序错在哪里?clearr=0.3894;n5_min=1200;n5_max=4400;n5=[n5_min:200:n5_max];Te=xlsread('uamax-Te.xls');i0=5.286;ig5=1;eta=0.81;m=4290;G=m*9.8;Cd=0.65;A=6.406;f=0.015;ua5=0.377*r.*n5/ig5/i0;Ft5=Te*i0*ig5
建议数值方法求解.
因为5次及以的上方程没有解析解.