Plane fit (z=ax+by+c) to 3D point data - MATLAB Answers - MATLAB Central

I have step plot (attached) and I want to fit a plane on the lower terrace of it. Excel file of point cloud is attached as well. Data represent in file is N-by-3 numeric data and each column corresponds to x, y and z. Could anyone please help me out how to fit the plane to the lower terrace?

[dynamicsoar]

簡潔…！しかし [yourData(:,1:2), ones(N,1)] にすれば a=B(1), b=B(2), c=B(3) になってこっちの方が直感的なような（どっちでもいいが）