matlab 函数傅里叶变换代码
时间: 2023-09-14 20:13:39 浏览: 122
以下是MATLAB中计算傅里叶变换的代码示例:
1. 使用MATLAB符号运算求解法求单边指数信号f(t)=e^(-2t)u(t)的傅里叶变换(FT):
```matlab
ft = sym('exp(-2*t)*heaviside(t)');
fw = fourier(ft);
```
结果为:
```
fw = 1/(2 + w*1i)
```
2. 使用MATLAB符号运算求解法求F(jw)=1/(1+w^2)的逆傅里叶变换(IFT):
```matlab
syms t;
Fw = sym('1/(1+w^2)');
ft = ifourier(Fw, t);
```
结果为:
```
ft = exp(-abs(t))/2
```
3. 使用MATLAB命令绘制单边指数信号f(t)=e^(-2t)u(t)的频谱图:
```matlab
ft = sym('exp(-2*t)*heaviside(t)');
Fw = fourier(ft);
subplot(211), ezplot(abs(Fw)), grid on, title('幅度谱')
phase = atan(imag(Fw)/real(Fw));
subplot(212), ezplot(phase), grid on, title('相位谱')
```
希望这些代码能够帮助你计算傅里叶变换。
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