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中最干净的方法是什么?
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?
推荐答案有两种方法可以执行此操作，具体取决于您要如何处理重复值.这是一个使用 sort :
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这是一个解决方案，它找到5个最大的 unique 值，然后找到等于这些值的 all 元素(如果有重复的值，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