How to interpolate/grid logical data?

Hello All,

I did not find answers for my question, so I post it here:

I have a matrix of logical gridded data (0 or 1), how could I interpolate them to finer scale gridded data?

E.g., originally, it is X=[1:3:22];Y=[1:3:10]; DATA=[0 0 0 0; 0 0 0 0; 0 1 1 0; 0 1 1 0; 0 1 1 0; 0 1 1 0; 0 0 0 0; 0 0 0 0]; Now I want to interpolate DATA to a new data (also a logical matrix), with X=[1:22];Y=[1:10];

Since I use these data to describe the shape of something. If I use interp2 or griddata, the shape of the matrix will be distorted. I could, of course, write a for loop to check point by point. But I really wish there is another elegant way to deal with this simple problem!!!

Thanks a lot,

Laura

[Matt J]

Clarify what you mean by "If I use interp2 or griddata, the shape of the matrix will be distorted."

If you do interp2(DATA,(1:22),(1:10).') then the resulting matrix will be 10x22. In what way is this a distorted shape? What is the shape that you do want?