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Random matrix with density.

I have a little question of comprehension

random_matrix(ZZ, 5, 4, x=0,y=11, density = 0.33)

generate a result like

[0 6 0 0]
[0 5 0 0]
[5 0 0 0]
[0 0 0 4]

but this gives 5 non zero enters which correspond, as I undeerstand it, to a density of 5/25 which is very far from .33 ? As always I suppose I have not clearly understood the meaning of density.

Should somebody explain this ?