Question

matlab函数的问题

有个关于函数定义跟函数调用的问题想请教一下大家
function [x1 x2] = equation_solve(a,b,c)
delt = b*b - 4*a*c;
if delt < 0
'there is no answer!!!'
elseif delt == 0
'there is one answer!!!'
x1 = (-a+sqrt(delt))/2;
x2 = x1
ans = x1
else
'there is two answers!!!'
x1 = (-a+sqrt(delt))/2;
x2 = (-a-sqrt(delt))/2;
ans = [x1 x2]
end
这个是我自己定义的函数，存为equation_solve.m
[x1 x2] = equation_solve(1,2,4);
[x1 x2] = equation_solve(1,2,1);
[x1 x2] = equation_solve(1,2,-1);
这个是我调用定义的函数的脚本，但是运行以后显示
ans =

there is no answer!!!

出错 equation_solve (line 2)
delt = b*b - 4*a*c;

调用 "D:\Documents\MATLAB\equation_solve.m>equation_solve" 时，未对输出参数 "x1" (可能还包括其他参数)赋值。

出错 ex4_16 (line 1)
[x1 x2] = equation_solve(1,2,4);
请问这个是什么意思，应该怎么修改呢？

Answer 1

你的程序解不出来这样的方程啊,你的程序停留在初中生的水平,一元二次方程组可以有复数解啊,如果你不要复数解,你可以这样改
if delt < 0
'there is no answer!!!'
后面加上x1='无实数解';x2='无实数解';