上面代码求出来的解是这样的 root(z^4 - (8*z^3)/5 + (247*z^2)/450 + (18*z)/125 - 36/625, z, 1) root(z^4 - (8*z^3)/5 + (247*z^2)/450 + (18*z)/125 - 36/625, z, 2) root(z^4 - (8*z^3)/5 + (247*z^2)/450 + (18*z)/125 - 36/625, z, 3) root(z^4 - (8*z^3)/5 + (247*z^2)/450 + (18*z)/125 - 36/625, z, 4) >> 为什么不能得到两个解
时间: 2024-02-21 12:01:03 浏览: 26
这段代码求解的方程是一个四次方程,因此可能存在4个不同的解。在MATLAB中,solve函数默认返回所有的解,因此你看到的结果是四个解,分别对应于根号下方程中的四个解。你可以通过指定输出变量的个数来获取其中任意一个解。例如,如果你只想获取第一个解,可以将代码修改为:
```
syms x;
eqn = x^2/(30*x-24)^2+0.3^2-x^2 == 0;
y = solve(eqn,x);
y = y(1)
```
这样就只会输出第一个解。如果你想获取另一个解,只需要将y的索引值修改即可。
相关问题
disp(sol) root(z^3 - 3*z - 1, z, 1) root(z^3 - 3*z - 1, z, 2) root(z^3 - 3*z - 1, z, 3)
The output of the given code snippet depends on the symbolic toolbox used by MATLAB. Here is the explanation of each function call:
- `disp(sol)` prints the value of the variable `sol` to the command window. The variable `sol` is not defined in the given code snippet, so this function call will result in an error.
- `root(z^3 - 3*z - 1, z, 1)` computes the first root of the polynomial `z^3 - 3*z - 1`. The output of this function call depends on the symbolic toolbox used by MATLAB. If the toolbox is installed and loaded, the output will be a symbolic expression representing the first root of the polynomial. Otherwise, this function call will result in an error.
- `root(z^3 - 3*z - 1, z, 2)` computes the second root of the polynomial `z^3 - 3*z - 1`. Similar to the previous function call, the output of this function depends on the availability of the symbolic toolbox.
- `root(z^3 - 3*z - 1, z, 3)` computes the third root of the polynomial `z^3 - 3*z - 1`. Similar to the previous function calls, the output of this function depends on the availability of the symbolic toolbox.
为什么输出是disp(sol) root(z^3 - 3*z - 1, z, 1) root(z^3 - 3*z - 1, z, 2) root(z^3 - 3*z - 1, z, 3)
这个输出是因为你使用了MATLAB中的solve函数来求解方程z^3 - 3*z - 1 = 0,并将结果存储在变量sol中。然后,使用disp函数来显示sol的值,即方程的三个根。
root(z^3 - 3*z - 1, z, 1)表示方程z^3 - 3*z - 1 = 0的第一个根,root(z^3 - 3*z - 1, z, 2)表示方程的第二个根,root(z^3 - 3*z - 1, z, 3)表示方程的第三个根。