From XY array data in pixels to BW image

Hi, I have a XY array matrix called A , the first column are the X values (column of the image) and the second Y values (rows of the image) and I need to create a BW image in which the points of the A matrix get color white in the image.

As an example, the A data could be:

A = randi(20,[10 2])

And the image size should be , is that correct?

A = randi(20,[10 2]);
idx = sub2ind([20 20],A(:,2),A(:,1));
BW = false(20,20);
BW(idx) = true;

Answer 1

[Ameer Hamza]

A little mistake in the calculation of idx

idx = sub2ind([20 20],A(:,2),A(:,1)); % Last input shoule be A(:,1)

Rest is correct.

[Alejandro Fernández]

Thank you :D