matlab 欧氏距离
时间: 2023-10-19 17:33:07 浏览: 42
在Matlab中,可以使用不同的方法来计算欧式距离。其中三种常用的方法如下:
方法1:通过对输入向量进行逐元素的计算,然后求和并开方。具体实现程序如下:
```matlab
function dist = dist_E(x,y)
dist = [];
if(length(x)~=length(y))
disp('length of input vectors must agree')
else
z = (x-y).*(x-y);
dist = sqrt(sum(z));
end
end
```
方法2:通过使用公式计算欧式距离。具体实现程序如下:
```matlab
function dist = dist_E(x,y)
[m,n = size(x);
dist = 0;
for i=1:max(m,n)
dist = dist + (x(i)-y(i))^2;
end
dist = sqrt(dist);
end
```
方法3:使用Matlab的pdist函数计算欧式距离。具体实现程序如下:
```matlab
function dist = dist_E(x,y)
dist = [x;y];
dist = pdist(dist);
end
```
测试代码如下:
```matlab
x = [1,3,0,2];
y = [2,3,2,0];
dist = dist_E(x,y);
```
你可以根据需求选择其中一种方法来计算欧式距离。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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