How to compute the average of distances between a column and other columns of a matrix?

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phdcomputer Eng 2018-12-29

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https://ww2.mathworks.cn/matlabcentral/answers/437588-how-to-compute-the-average-of-distances-between-a-column-and-other-columns-of-a-matrix

评论： Rik 2019-1-2

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I want to compute the average of distances between a column and other columns in a matrix except itself.

I'm not sure that the if section is true or not.

the data matrix is nXm size

I'll be grateful to have your opinion.

for i=1:m 
    for j=1:m-1
        if(i==j)  
            t=0
        else
            t=pdist2(data(:,i),data(:,j),'jaccard');
            b=sum(t)/(m-1);
        end  
    end
end
plot(b)

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phdcomputer Eng 2019-1-2

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Thank you

This point you mentioned is my question too, in this code , how to define a vector of values for saving all of the distances in iterations? Are t and b two vectors or just variables?

for i=1:m 
    for j=1:m-1
        if(i==j)  
            t=0
        else
            t=pdist2(data(:,i),data(:,j),'jaccard');
            b=sum(t)/(m-1);
        end  
    end
end
plot(b)