matlab 求两个数组中重复的数值及数量
时间: 2024-10-03 11:02:15 浏览: 53
在MATLAB中,你可以使用` intersect `函数以及` ismember `函数结合` histcounts `来找到两个数组中重复的元素及其出现的次数。以下是基本步骤:
1. 首先,使用` intersect `函数找出两个数组的交集,得到重复的元素集合:
```matlab
common_elements = intersect(array1, array2);
```
2. 然后,使用` ismember `函数检查每个数组中的元素是否在交集中,可以得到一个布尔向量,表示哪些位置的元素是重复的:
```matlab
match_matrix = ismember(array1, common_elements) | ismember(array2, common_elements);
```
3. 接着,对这个布尔矩阵应用` sum `函数,按列求和,即可得到每个重复元素出现的次数:
```matlab
counts = sum(match_matrix, 'all');
```
4. 最后,将元素和对应的计数组合成结构体数组,方便查看:
```matlab
duplicates = containers.Map(common_elements, counts);
```
如果你想看到重复元素及其在原数组中的索引,可以这样做:
```matlab
[unique_elements, ~, idx] = unique(array1, 'stable'); % 使用 stable 参数保持顺序
[~, count] = histc(idx, find(common_elements)); % 获取元素在原数组中的索引计数
```
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