MATLAB: Finding distance of distinct value

distance

Hi, suppose I have a matrix as follows:
I =
     1     1     5     1     1     1     8
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     2     1     1     1
     1     1     1     1     1     6     1
     1     1     3     1     1     1     1
I(3,4) is 1 . I need to know the distance of this one from the distinct value of this matrix.i.e distances of 2,3,5,6,8. How to do this easily? and also need the matrix position of that value.Thanks in advance.

Best Answer

variant
o34 = zeros(size(I));
o34(3,4)=1;
o34d = bwdist(o34);
distato34 = [I(I~=1) o34d(I~=1)]
more variant
o = [3 4];
dC = arrayfun(@(x)(cumsum(ones(size(I)),x)-o(x)).^2,1:2,'un',0);
d = sqrt(dC{1} + dC{2});
l = I~=1;
out = [I(l) d(l)]
more more variant
[Hi Hj] = find(I~=1);
out = [I(I~=1) sqrt(sum(bsxfun(@minus,[Hi Hj],[3 4]).^2,2))]
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