使用迭代法求解方程 (e^x + 10x - 2 = 0) 的近似根,给定初始值 (x_0 = 0) 和迭代公式 (x_{k+1} = \frac{2 - e^{x_k}}{10})。要达到误差不超过 10^-8,显示每次迭代的结果和迭代次数
时间: 2024-10-17 11:04:14 浏览: 62
当然,我们可以使用迭代法(例如牛顿迭代法或更直接的方法)来逼近方程 \( e^x + 10x - 2 = 0 \) 的根。给定初始值 \( x_0 = 0 \) 和迭代公式 \( x_{k+1} = \frac{2 - e^{x_k}}{10} \),我们将执行以下步骤:
1. 定义一个函数 `f` 表示方程 \( f(x) = e^x + 10x - 2 \)。
2. 创建一个函数 `iterate` 来计算新的估计值并检查误差。
3. 设置迭代停止条件(当绝对误差小于 \( 10^{-8} \) 时)。
4. 迭代直到满足停止条件,同时记录每次迭代的结果和次数。
下面是相关的Matlab代码实现:
```matlab
% 函数定义
function result = f(x)
result = exp(x) + 10*x - 2;
end
% 初始值和迭代函数
x0 = 0;
tol = 1e-8; % 误差阈值
max_iter = 1000; % 最大迭代次数
% 迭代过程
iter_count = 0;
previous_x = x0;
current_x = x0;
while abs(current_x - previous_x) > tol && iter_count < max_iter
iter_count = iter_count + 1;
% 计算新的估计值
current_x = (2 - f(previous_x)) / 10;
% 显示当前迭代结果
fprintf('Iteration %d: x = %.16f\n', iter_count, current_x);
% 更新先前值
previous_x = current_x;
end
% 结果输出
if iter_count == max_iter
error('Maximum number of iterations reached without convergence.');
else
fprintf('Converged after %d iterations.\n', iter_count);
end
```
运行这段代码后,你会看到每一步迭代以及何时达到误差要求或达到最大迭代次数。如果迭代过程中没有达到误差阈值,则会提示未收敛。
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