I can't understand a piece of code

I am extremely new to Matlab and I can't understand a basic thing I guess. I downloaded an available code of a basic active contour model(snake) and in the function, I don't understand what variable P is. Can anybody explain for me?

[Jan]

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Answer 1

[Reen]

It looks like P is a matrix that stores the x and y coordinates of the snake contour at N different points. The matrix has N rows, (so N different x and y values) and 2 columns (first is x position, second is y position). If you had the P matrix and wanted to look at the first set of coordinates, you could access them by typing:

 P(1,:); % This means: P(first row, every entry) and we would get [x1 y1] as an answer

[Arn Raj]

@Reen Thanks a lot for your help.