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

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)

[Rik]

Looks like a continuation from here.

Without looking into the details of your background, one issue is immediately apparent: you are overwritting your output data on every iterarion.

[phdcomputer Eng]

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)

[Rik]

Use the debugger to step through your code line by line and see what happens. That's how I would find out.

The debugging tools are one of the points where Matlab crushed the competition by GNU Octave, so you should really learn to use them.