这是什么原因啊？急求！。

syms a b c d e f g;

>> [a,b,c,d,e,f,g]=solve('-62.747*d*cosd(b)*cosd(c)+10.193*d*cosd(b)*sind(c)-46.134*d*sind(b)+e=-4.02','-62.747*d*(-cosd(a)*sind(c)+sind(a)*sind(b)*cosd(c))+10.193*d*(cosd(a)cosd(c)+sind(a)*sind(b)*sind(c))-46.134*d*sind(a)*cosd(b)+f=7.194','-62.747*d*(sind(a)*sind(c)+cosd(a)*sind(b)*cosd(c))+10.193*d*(-sind(a)*cosd(c))-46.134*d*cosd(a)*cosd(b)+g=-21.626','-62.119*d*cosd(b)*cosd(c)+14.046*d*cosd(b)*sind(c)-41.856*d*sind(b)+e=-1.862','-62.119*d*(-cosd(a)*sind(c)+sind(a)*sind(b)*cosd(c))+14.046*d*(cosd(a)cosd(c)+sind(a)*sind(b)*sind(c))-41.856*d*sind(a)*cosd(b)+f=0.76','-62.119*d*(sind(a)*sind(c)+cosd(a)*sind(b)*cosd(c))+14.046*d*(-sind(a)*cosd(c))-41.856*d*cosd(a)*cosd(b)+g=-14.435','-67.441*d*cosd(b)*cosd(c)+13.575*d*cosd(b)*sind(c)-46.126*d*sind(b)+e=-5.776','-67.441*d*(-cosd(a)*sind(c)+sind(a)*sind(b)*cosd(c))+13.575*d*(cosd(a)cosd(c)+sind(a)*sind(b)*sind(c))-46.126*d*sind(a)*cosd(b)+f=5.986','-67.441*d*(sind(a)*sind(c)+cosd(a)*sind(b)*cosd(c))+13.575*d*(-sind(a)*cosd(c))-46.126*d*cosd(a)*cosd(b)+g=-21.559');

错误使用 solve>getEqns (line 418)

List of equations must not be empty.

出错 solve (line 226)

[eqns,vars,options] = getEqns(varargin{:});

Answer 1

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方程两边用两个等号连接而不是一个,此外cosd(a)cosd(c)这种写法也不行,如果是乘积就老老实实写成cosd(a)*cosd(c)

然后,solve函数调用格式怕是有问题,doc solve参考示例,比较新的版本的写法都是

[a,b,c,d,e,f,g]=solve([-62.747*d*cosd(b)*cosd(c)+10.193*d*cosd(b)*sind(c)-46.134*d*sind(b)+e==-4.02,...
    -62.747*d*(-cosd(a)*sind(c)+sind(a)*sind(b)*cosd(c))+10.193*d*(cosd(a)*cosd(c)+sind(a)*sind(b)*sind(c))-46.134*d*sind(a)*cosd(b)+f==7.194,...
    -62.747*d*(sind(a)*sind(c)+cosd(a)*sind(b)*cosd(c))+10.193*d*(-sind(a)*cosd(c))-46.134*d*cosd(a)*cosd(b)+g==-21.626,...
    -62.119*d*cosd(b)*cosd(c)+14.046*d*cosd(b)*sind(c)-41.856*d*sind(b)+e==-1.862,...
    -62.119*d*(-cosd(a)*sind(c)+sind(a)*sind(b)*cosd(c))+14.046*d*(cosd(a)*cosd(c)+sind(a)*sind(b)*sind(c))-41.856*d*sind(a)*cosd(b)+f==0.76,...
    -62.119*d*(sind(a)*sind(c)+cosd(a)*sind(b)*cosd(c))+14.046*d*(-sind(a)*cosd(c))-41.856*d*cosd(a)*cosd(b)+g==-14.435,...
    -67.441*d*cosd(b)*cosd(c)+13.575*d*cosd(b)*sind(c)-46.126*d*sind(b)+e==-5.776,...
    -67.441*d*(-cosd(a)*sind(c)+sind(a)*sind(b)*cosd(c))+13.575*d*(cosd(a)*cosd(c)+sind(a)*sind(b)*sind(c))-46.126*d*sind(a)*cosd(b)+f==5.986,...
    -67.441*d*(sind(a)*sind(c)+cosd(a)*sind(b)*cosd(c))+13.575*d*(-sind(a)*cosd(c))-46.126*d*cosd(a)*cosd(b)+g==-21.559],[a,b,c,d,e,f,g]);

最后,9个方程求7个未知数,超定了,无解太正常了