In case anyone ever needs it:
slice_bw = zeros(pix, pix);
for n = 1:length(in1(:,1))
xy = in1(n,:);
slice_bw(xy(1),xy(2)) = 1;
end
Create a matrix of zeros that is the dimension you want. in1 is my data in xy coordinate form. You iterate through your data to find the location in the zero matrix that corresponds to the coordinates and if the coordinate exists, the location in the matrix is set to 1.