How can I display a 2D binary matrix as a black & white plot?

 I have a 2D binary matrix that I want to display as a black and white plot. For example, let's say I have a 4-by-4 matrix as follows: 

1 1 0 1
0 0 1 0
1 1 0 1
1 0 0 0

How can this be plotted as a black and white matrix? Some of my input binary matrices are of size 100-by-9, so I would ideally need a solution that generalizes to different sized matrices. 

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Answers: 

If you want to make a crossword-type plot as shown here (with grid lines and black and white squares) you can use the imagesc function, a gray colormap, and modify the axes properties like so: 

 

mat = [1 1 0 1; 0 0 1 0; 1 1 0 1; 1 0 0 0];  % Your sample matrix
[r, c] = size(mat);                          % Get the matrix size   

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