matlab - Understanding the output of of convhull -

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can please explain me values stored in kk for

a=[2 0 0;     0 2 0;     0 0 2;    1 1 sqrt(2)];  kk= convhull(a);

values in kk:

1   2   4 1   3   2 1   4   3 2   3   4

have read documentation of convhull?

it explains (for 3d case):

k = convhull(x,y,z) returns 3-d convex hull of points (x,y,z), x, y, , z column vectors.
k triangulation representing boundary of convex hull. k of size mtri-by-3, mtri number of triangular facets. is, each row of k triangle defined in terms of point indices.

in example convex hull of the 4 points in a defined 4 triangular facets

[1 2 4] --> [ (2,0,0), (0,2,0), (1,1,sqrt(2)) ] %// first triangle [1 3 2] --> [ (2,0,0), (0,0,2), (0,2,0) ] %// second triangle ...

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