代入

研究始めた．
matlabで変数に複素数が代入できない．
なんてこった．

 >>pvar x
 >>subs(x,i)
??? Error using ==> polynomial.polynomial
Coefficient must be a real vector.

Error in ==> polynomial.combine at 42
  b = polynomial(coefficient,degmat,varname,matdim);

Error in ==> polynomial.subs at 218
b = combine(b);

Error in ==> polynomial.subs at 72
  b=subs(a,a.varname{1},old);

Real numberじゃないとだめ，とか怒られる．
えー．