假设我有以下矩阵:
01 02 03 06 03 05 07 02 13 10 11 12 32 01 08 03我想要前 5 个元素的索引(在本例中为 32、13、12、11、10).在 MATLAB 中执行此操作的最简洁方法是什么?
And I want the indices of the top 5 elements (in this case, 32, 13, 12, 11, 10). What is the cleanest way to do this in MATLAB?
推荐答案根据您希望如何处理重复值,有几种方法可以做到这一点.这是一个使用 排序:
There are a couple ways you can do this depending on how you want to deal with repeated values. Here's a solution that finds indices for the 5 largest values (which could include repeated values) using sort:
[~, sortIndex] = sort(A(:), 'descend'); % Sort the values in descending order maxIndex = sortIndex(1:5); % Get a linear index into A of the 5 largest values这里有一个解决方案,它找到 5 个最大的 unique 值,然后找到等于这些值的 所有 元素(如果有重复值,则可能超过 5 个),使用 unique 和 ismember:
Here's a solution that finds the 5 largest unique values, then finds all elements equal to those values (which could be more than 5 if there are repeated values), using unique and ismember:
sortedValues = unique(A(:)); % Unique sorted values maxValues = sortedValues(end-4:end); % Get the 5 largest values maxIndex = ismember(A, maxValues); % Get a logical index of all values % equal to the 5 largest values更多推荐
获取矩阵中 n 个最大元素的索引
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