How to use matlab function to fill or label the previous or next column cells with respect to certain column of of a matrix with a number (3)

As clear from figure, this is my M-matrix.

With respect to 2nd colum, in first colum, the 3rd row or 4th row i.e horizentally, i want to fill with 3 i.e. horizentally or diagonally.

similarly in 3rd column, i want to fill 3rd row or 4th rows same like above procedure.

% i want in each colum to have closing ie. startring 3 and then closing 3 i.e. the last one. Thanks for all coopeation. Warm regrads

Answer 1

[Image Analyst]

Try imdilate() -- it's a local max filter.

se = [0,0,0;1,1,1;1,1,1]
outputMatrix = imdilate(inputMatrix, se);

[M.S. Khan]

Thanks!! so nice of you for helping

[M.S. Khan]

@image analyist, if i want only introduce 3 diagonally, then how can we proceed. plz guide

[M.S. Khan]

Outputmatrix = [ 0 0 0

0 0 0

0 3 0

3 <-- 0 0 0 --> 3

0 0 0

3 3 3]

Hope you got my point, right. If i want to introduce 3 diagnonally only, ignorning the horizental 3s.then how should we proceed. Thanks for all cooperation. Regards

[Image Analyst]

This will work:

% Create sample data.
m =  zeros(11, 3);
% Set a few locations (7) to 3
randomLocations = randperm(numel(m), 7);
m(randomLocations) = 3

% Now we have our matrix and we can begin.
[rows, columns] = size(m);
mOut = m; % Initialize
for row = 2 : rows
	% Check column 1
	if m(row-1, 2) == 3
		mOut(row, 1) = 3;
	end
	% Check column 2
	if m(row-1, 1) == 3 || m(row-1, 3) == 3
		mOut(row, 2) = 3;
	end
	% Check column 3
	if m(row-1, 2) == 3
		mOut(row, 3) = 3;
	end
end
mOut % Print to command window

[M.S. Khan]

Image Analyst, thanks for giving idea. i want this coding as dynamic. i dont apply or metion colums 1 or 2 or 3. i want to handle it as general rows and columns.

plz help me how to apply it on a matrix.

i applied it but its giving me problem ie. out of bounds.

could you plz help how to sort it out.

% Create sample data.
m =  zeros(11, 3);
% Set a few locations (7) to 3
randomLocations = randperm(numel(m), 7);
m(randomLocations) = 3
% Now we have our matrix and we can begin.
[rows, colms] = size(m);
mOut = m; % Initialize
for row = 2 : rows
    for colm = 1:colms
	% Check column 1
        if m(row-1, colm+1) == 3
		mOut(row, colm) = 3
        end
	% Check column 2
        if m(row-1, colm) == 3 || m(row-1, colm+2) == 3
		mOut(row, colm+1) = 3
        end
	% Check column 3
        if m(row-1, colm+1) == 3
		mOut(row, colm+2) = 3
        end
    end     
end
mOut % Print to command window

[M.S. Khan]

Hello Dear Image Analyst, could u plz reply. Thanks for all cooperation