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Help with NDSolve`FiniteDifferenceDerivative function

Posted 20 days ago
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Hello, please I need your help to understand two commands, I'm trying to understand the method of line to solve heat equation using line method, this is the beginning of the my code:

np = 5;
ugrid = 1/np Range[0, np]
fd1 = NDSolve`FiniteDifferenceDerivative[Derivative[1], ugrid];
m1 = fd1["DifferentiationMatrix"];

If I'm not wrong " fd1 " is the approximation of the first derivative in each point of the grid, my problem is in "m1" what is this command? What does "DifferentiationMatrix" present?

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