用MATLAB编写函数求y=1/1²+1/2²+……+1/n²
时间: 2023-11-22 09:05:25 浏览: 519
以下是MATLAB编写函数求y=1/1²+1/2²+……+1/n²的代码:
```matlab
function y = sum_of_squares(n)
y = 0;
for i = 1:n
y = y + 1/i^2;
end
end
```
在MATLAB中,可以使用for循环来实现累加求和。在这个函数中,我们首先将y初始化为0,然后使用for循环从1到n遍历每个数,将1/i²加到y中。最后,返回y作为函数的输出。
相关问题
1.Matlab计算根据 π²/6=1/1²+1/2²+1/3²+……+1/n².求π的近似值。当n分别取100、1000、10000时,结果是多少要求:分别用循环结构和向量运算(使用sum函数)来实现。 2.Matlab计算a=1+2+3+……+100。
1. 使用循环结构实现:
```matlab
n = 100;
sum1 = 0;
for i = 1:n
sum1 = sum1 + 1/i^2;
end
approx_pi1 = sqrt(6 * sum1);
n = 1000;
sum2 = 0;
for i = 1:n
sum2 = sum2 + 1/i^2;
end
approx_pi2 = sqrt(6 * sum2);
n = 10000;
sum3 = 0;
for i = 1:n
sum3 = sum3 + 1/i^2;
end
approx_pi3 = sqrt(6 * sum3);
```
使用向量运算(使用sum函数)实现:
```matlab
n = 100;
sum1 = sum(1./(1:n).^2);
approx_pi1 = sqrt(6 * sum1);
n = 1000;
sum2 = sum(1./(1:n).^2);
approx_pi2 = sqrt(6 * sum2);
n = 10000;
sum3 = sum(1./(1:n).^2);
approx_pi3 = sqrt(6 * sum3);
```
2. Matlab计算a=1+2+3+……+100的结果可以使用等差数列求和公式来计算,也可以使用循环结构实现:
```matlab
% 使用等差数列求和公式
n = 100;
a = n * (n + 1) / 2;
% 使用循环结构
n = 100;
sum_a = 0;
for i = 1:n
sum_a = sum_a + i;
end
```
帮我写一个用matlab设计模拟滤波器系统函数为Ha(s)=3/(s²+4s+3)的AF的幅度特性的程序
好的,以下是用 MATLAB 设计模拟滤波器系统函数为 Ha(s) = 3/(s²+4s+3) 的 AF 幅度特性的程序:
```matlab
% 定义系统函数 Ha(s)
num = [3];
den = [1 4 3];
Ha = tf(num, den);
% 绘制幅度特性曲线
w = logspace(-2, 2, 1000); % 频率范围
[mag, phase] = bode(Ha, w); % 计算幅度和相位
magdB = 20*log10(mag); % 将幅度转换为 dB
semilogx(w, magdB); % 绘制幅度特性曲线
grid on; % 添加网格线
title('AF幅度特性曲线'); % 添加标题
xlabel('频率 (rad/s)'); % 添加横坐标标签
ylabel('幅度 (dB)'); % 添加纵坐标标签
```
执行以上程序,即可得到 AF 幅度特性曲线。
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