finding nearest label distance

Hi I have the following matrix

I =

     0     1     0     0     1     0
     0     0     0     1     0     0
     0     0     0     0     0     0
     0     0     1     1     0     0
     0     1     0     0     1     0
     1     0     0     0     0     1

and

L=bwlabel(I)

L =

     0     2     0     0     3     0
     0     0     0     3     0     0
     0     0     0     0     0     0
     0     0     1     1     0     0
     0     1     0     0     1     0
     1     0     0     0     0     1

and I know a position say (4,1). How to find the nearest label from the position (4,1)

the follwoing code determines the nearest label, I need to know what is the distance of this label from that pixel?

M = zeros(size(L));

M(4,1) = 1;

Md = bwdist(M);

Ll = logical(L);

mmn = min(Md(Ll));

[ii jj] = find((Md == mmn)&Ll);

out = L(ii,jj)

also need to know what is going on with the following code:

mmn = min(Md(Ll));

Answer 1

[Andrei Bobrov]

1. coordinates of the nearest pixel

[ii jj] = find((Md == mmn)&Ll);

2. number of labels nearest pixel

 out = L(ii,jj);

3. the minimum distance from the center pixel (4,1) to nearest pixel which belongs to a nearest label

mmn = min(Md(Ll));

[Mohammad Golam Kibria]

Thanks