如何找到与其他向量的最大值对应的向量的索引? [英] How to find the index of vector that corresponds with highest value of other vector?

问题描述

我有一个向量，例如

A=[0.2 0.5 0.4 0.6] 

标记为

的

A_labels=[1 2 3 4]

其他向量B等于

B=[30 10 20]

我假设向量B的最大值将分配给A中的最高标签，并按顺序减小.那是

30 will assign for 4
10 will assign for 2
20 will assign for 3

我将扫描向量B的所有元素，并希望根据上述规则找到与之对应的标签.您能帮我在MATLAB中实现该方案吗?谢谢

A=[0.2 0.5 0.4 0.6]
A_lables=1:1:size(A,2);
B=[30 10 20];
for i=1:size(B,2)
    //Find label of A_labels corresponds with B(i)
    // Result will be [4 2 3]
end

解决方案

我认为这可以满足您的需求.如您的示例所示，我假设对A_labels进行了排序.

[~, ind] = sort(B); %// sort B and get *indices* of the sorting
[~, ind] = sort(ind); %// get *rank* of each element of B
result = A_labels(end-numel(ind)+ind);

I have a vector such as

A=[0.2 0.5 0.4 0.6] 

that labels as the

A_labels=[1 2 3 4]

and other vector B equals

B=[30 10 20]

I assume that the highest values of vector B will be assigned for highest label in A, and reduces by order. That means

30 will assign for 4
10 will assign for 2
20 will assign for 3

I will scan all element of vector B and I want to find which labels corresponding with its based on above rule. Could you help me implement that scheme in MATLAB? Thanks

A=[0.2 0.5 0.4 0.6]
A_lables=1:1:size(A,2);
B=[30 10 20];
for i=1:size(B,2)
    //Find label of A_labels corresponds with B(i)
    // Result will be [4 2 3]
end

解决方案

I think this does what you want. I'm assuming A_labels is sorted, as in your example.

[~, ind] = sort(B); %// sort B and get *indices* of the sorting
[~, ind] = sort(ind); %// get *rank* of each element of B
result = A_labels(end-numel(ind)+ind);

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