How to put the values into the specific area and put color

A = zeros(70);

I have 168 values is 1-4

Ex Values = { 1, 2, 3, 1, 2, 1, 1, 1, .....}

location is (15,15),(16,15),(17,15), ......... (27,15)

(15,16),(16,16),(17,16),............... (27,16)

(15,17),(16,17),(17,17),.................(27,17)

.

.

.

(15,27),(16,27),(17,27),............... (27,27)

and I want to input color on this location

1 = red

2 = green

3 = blue

4 = black

How to make this in loop?

Thank you.

Answer 1

[Akira Agata]

You don't need to use for-loop. The following is one possible solution.

A = zeros(70);

% Sample 168-by-1 random array with 1-4.
Values = randi(4,168,1);

% Sample 168-by-2 random array of location
[row,col] = ind2sub(size(A),randperm(numel(A),168));
Location = [row',col'];

% Create label matrix
Label = A;
Label(sub2ind(size(A),Location(:,1),Location(:,2))) = Values;

% Create RGB image
cmap = [...
  1 0 0;... % red
  0 1 0;... % green
  0 0 1;... % blue
  0 0 0];   % black
RGB = label2rgb(Label,cmap);