在Matlab中对向量进行排序 [英] sort vector in matlab

问题描述

我有以下代码来计算峰及其指数并显示它们，但是我想对峰值进行排序并显示出来，所以我的代码正在跟踪

i have following code which calculates peaks and their indexes and also display them,but i want to sort peaks value and display so,so my code is following

function [peaks,peak_indices] = find_peaks(row_vector)
    A = [0 row_vector 0];
    j = 1;
    for i=1:length(A)-2
        temp=A(i:i+2);
        if(max(temp)==temp(2))
            peaks(j) = row_vector(i);

            peak_indices(j) = i;
            j = j+1;
        end
    end
end

通过以下方式实现后，会向我显示输出

which after implementing it by following way,it shows me output

A = [2 1 3 5 4 7 6 8 9];
>> [peaks, peak_indices] = find_peaks(A)

peaks =

     2     5     7     9


peak_indices =

     1     4     6     9

但是我不想直接显示峰，而是想按降序显示峰，或者像这样 9 7 5 2，我知道在matlab中存在函数排序，就像下面的方式

but instead of display peaks directly,i want to display peaks in decreasing order ,or like this 9 7 5 2,i know that there exist function sort in matlab,like following way

b=[2 1 3 4 6 5];
>> sort(b)

ans =

     1     2     3     4     5     6

但是有两个问题，首先是按升序排序，还有如何在我的第一个函数中使用sort函数以降序形式返回峰?

but there is two issues,first it sort in increasing order,also how to use sort function in my first function to return peaks in decreasing sorted form?

推荐答案

您可以这样做:

peaks = sort(peaks, 'descend')

要分别对peak_indices重新排序，还可以从sort获取排序的索引:

To re-order peak_indices respectively, obtain the sorted indices from sort as well:

[peaks, idx] = sort(peaks, 'descend');  %// Sort peaks
peak_indices = peak_indices(idx);       %// Reorder peak indices accordingly

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