matlab 解方程組系數(shù)問(wèn)題
如下：我先算出系數(shù),然后求解可以得到解：
[t,x,y]=solve('(x-2193.82160000000)^2+(y-1478.25070000000)^2=25',...
'-7.47648319531258*t^3+0*t^2+151.200383195313*t+2193.82160000000=x',...
'3.30035879077234*t^3+0*t^2+87.7309412092275*t+1478.25070000000=y')
但是我將系數(shù)用符號(hào)代替就會(huì)出問(wèn)題,其中ex(1)對(duì)應(yīng)上面的：-7.47648319531258
[t,p,q]=solve('(p-x(1))^2+(q-y(1))^2=25',...
'ex(1)*t^3+ex(2)*t^2+ex(3)*t+ex(4)=p',...
'ey(1)*t^3+ey(2)*t^2+ey(3)*t+ey(4)=q')
是什么原因,望高手解答,不勝感激!