确定向量中每个唯一元素的出现次数 [英] Determining the number of occurrences of each unique element in a vector

问题描述

如何确定MATLAB向量中某个值的相对频率?

How can I determine the relative frequency of a value in a MATLAB vector?

vector = [ 2 2 2 2 1 1 1 2 2 1 1 1 2 2 2 2 1 2 ];

哪个函数将返回每个唯一元素的出现次数?

What function will return the number of occurrences of each unique element?

推荐答案

您可以将unique与histc结合使用以获得相对频率.

You can use unique in combination with histc to get the relative frequency.

A=[1,2,3,1,2,4,2,1]; %#an example vector
unqA=unique(A);

这将唯一元素表示为unqA=[1,2,3,4].要获取发生次数，

This gives the unique elements as unqA=[1,2,3,4]. To get the number of occurances,

countElA=histc(A,unqA); %# get the count of elements
relFreq=countElA/numel(A);

这给出了countElA=[3,3,1,1]和relFreq=[0.3750, 0.3750, 0.1250, 0.1250]，这是唯一元素的相对频率.这将适用于整数和浮点数.

This gives countElA=[3,3,1,1] and relFreq=[0.3750, 0.3750, 0.1250, 0.1250], which is the relative frequency of the unique elements. This will work for both integers and floating points.

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