Is it correct to build a tree?

[slaythemall]

function choinka(n)
        if n > 0
                x = [];
                y = [];
                k = 0;
                for i = 1:n
                        for j = 1:i
                                k = k + 1;
                                x(k) = -j;
                                y(k) = i;
                        end
                end
                plot(x,y,'k*');
                axis([-(n+1) 0 0 n+1]);
                title("Choinka");
        end
 endfunction



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