how to solve this error: "Subscript indices must either be real positive integers or logicals"?

[poster]

I wrote this program for computing the average of the distance between each feature and the rest of the features in the colon dataset. I defined a function for computing Chebyshev distance.

close all;

clc

load colon.mat 

data=colon; 

[n,m]=size(data);

for i=1:m-1

     for j=i+1:m

           t(i,j)=fChebyshevDist(data(:,i),data(:,j));

              b=sum(t)/(m-1);

     end

   end





 function [ fchd ] = fChebyshevDist(p,q)

 fchd=max(abs(p-q));

 end

I found this error "Subscript indices must either be real positive integers or logicals" for this line:

 t(i,j)=fChebyshevDist(data(:,i),data(:,j));

that I really haven't got any idea to solve. I'll be very grateful to have your opinions. Thanks

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