Question

我试图在我的m文件中使用此函数但是我收到错误（提到了问题）。一切似乎都正确，a，b和c在我的m文件中定义。有什么想法吗？错误： Error in modal2 (line 8) [v,an]=eig(a); Output argument "am" (and maybe others) not assigned during call to "C:\Users\Cena\Desktop\Thesis\My Codes\SMC\modal2.m>modal2".

function [r,am,bm,cm] = modal2(a,b,c)
% this function determines the modal representation 2(am,bm,cm)
%given a generic state-space representation (a,b,c)
%and the transformation r to the modal representation
%such that am=inv(r)*a*r, bm=inv(r)*b and cm=c*r

%transformation to complex-diagonal form:
[v,an]=eig(a);
bn=inv(v)*b;
cn=c*v;

%transformation to modal form 2:
i = find(imag(diag(an))');
index = i(1:2:length(i));
   j=sqrt(-1);
   t = eye(length(an));

if isempty(index)
   am=an;bm=bn;cm=cn;

else
   for i=index
        t(i:i+1,i:i+1)=[j 1;-j 1];
end
%Modal transformation
    r=v*t;
end

Answer 1

问题可能在

if isempty(index)
   am=an;bm=bn;cm=cn;

只有在条件通过时才会对这些变量进行赋值。如果没有，则没有任务。

如果它们将成为输出参数，您需要修改代码以在所有条件下分配这些变量。

输出参数＆＃34; am＆＃34; （也许是其他人）在通话期间未分配

1 个答案: