返回信息流抄的一段代码：
disp('This program solves for the roots of a quadratic ');
disp('equation of the form A*X^2+B*X+C=0.');
a=input('Enter the coefficient A:');
b=input('Enter the coefficient B:');
c=input('Enter the coefficient C:');
discriminant=b^2-4*a*c;
if discriminant >0
x1=(-b+sqrt(discriminant))/(2*a);
x2=(-b-sqrt(discriminant))/(2*a);
disp('This equation has two real roots:');
fprintf('x1=%f\n',x1);
fprintf('x2=%f\n',x2);
elseif discriminant==0
x1=(-b)/(2*a);
disp('This equation has two identical real roots:');
fprintf('x1=x2=%f\n',x1);
else
real_part=(-b)/(2*a);
imag_part=sqrt(abs(discriminant))/(2*a);
disp('This equation has two complex roots');
fprintf('x1=%f+i%f\n',real_part,imag_part);
fprintf('x2=%f-i%f\n',real_part.imag_part);
end
但是matlab运行后显示：
This program solves for the roots of a quadratic
equation of the form A*X^2+B*X+C=0.
Mex file entry point is missing. Please check the (case-sensitive)
spelling of mexFunction (for C MEX-files), or the (case-insensitive)
spelling of MEXFUNCTION (for FORTRAN MEX-files).
??? Invalid MEX-file 'C:\Windows\system32\input.dll': .
Error in ==> calc_root at 3
a=input('Enter the coefficient A:');
不知道这是怎么回事，应该怎么解决？
这是一条镜像帖。来源：北邮人论坛 / matlab / #7886同步于 2011/2/27
该镜像源已超过 30 天没有更新，可能在源站已被删除。
Matlab机器人发帖
求解决办法：Mex file entry point is missing.
xingkongyue
2011/2/27镜像同步2 回复
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