添加高斯分布函数.

Signed-off-by: lion.chan <cy187lion@sina.com>
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lion.chan 2022-08-24 19:46:01 +08:00
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# 高斯分布
## 一维高斯分布
$$G(x)=\frac{1}{\sigma\sqrt{2\pi}}e^{-\frac{(x-\mu)^2}{2\sigma^2}}$$
Matlab 图像绘制程序:
```m
sig=1;
mu=0;
x=-5:0.1:5;
gx=e.^(-(x-mu).^2/(2*sig^2))/(sig*sqrt(2*pi));
plot(x, gx)
```
## 二维高斯分布
$$G(x,y)=Ae^{(-\frac{(x-x_0)^2}{2\sigma_x^2}+\frac{(y-y_0)^2}{2\sigma_y^2})}$$
Matlab 图像绘制程序:
```m
x1 = [0:0.1:10];
y1 = [0:0.1:10];
[x,y] = meshgrid(x1,y1);
gxy = exp(-((x-5).*(x-5)+(y-5).*(y-5))/18);
surf(x, y, gxy);
```