How do I change the colors of a matrix image?

I have a script that will generate a 12x12 matrix of ones and zeros. When I create an image from this the default colours are yellow for one and blue for zero. I want to change this to white for zero and red for one.

Can anyone help me?

Thanks,

Joe

m = zeros(12, 12);
numIterations = 1800;
row = ones(1, numIterations);
col = ones(1, numIterations);
m(row(1), col(1)) = 1;
imagesc(m);
axis('on', 'image');
percentage = 0.40; % 20% of time will be the same
for k = 2 : numIterations
	if rand(1) < percentage
		% 20% of the time it will stay in the same place.
		row(k) = row(k-1);
		col(k) = col(k-1);
	else
		% 80% of the time it will select a new place.
		% First get a tentative new location.
		row(k) = row(k-1) + randi([-1,1], 1);
		col(k) = col(k-1) + randi([-1,1], 1);
		while row(k) == row(k-1) && col(k) == col(k-1) || row(k) <= 0 || row(k) > size(m, 1) || col(k) <= 0 || col(k) > size(m, 2)
			% Get a new location.
			row(k) = row(k-1) + randi([-1,1], 1);
			col(k) = col(k-1) + randi([-1,1], 1);
			while row(k) <= 0 || row(k) > size(m, 1)
				row(k) = row(k-1) + randi([-1,1], 1);
			end
			while col(k) <= 0 || col(k) > size(m, 2)
				col(k) = col(k-1) + randi([-1,1], 1);
			end
		end
	end
	m(row(k-1), col(k-1)) = 0; % Clear old location
	m(row(k), col(k)) = 1;	% Set new location
	imagesc(m);
	grid on;
	caption = sprintf('At Iteration %d, Row = %d, Column = %d', k, row(k), col(k));
	title(caption, 'FontSize', 15);
	drawnow;
	pause(0.8)
end

Answer 1

[Ameer Hamza]

Use colormap

imagesc(m);
colormap([1 1 1; 1 0 0])
grid on;

[Image Analyst]

How does this give white background with a red square?

[Ameer Hamza]

Oh! That was a mistake. Thanks for pointing out.