function res=marche2(N)
	e=[0 1 ; 0 -1 ; 1 0 ; -1 0];
	alea=floor(4.*rand(1,N-1))+1;
	aux=[0 0];
		for j=1:N-1
		aux=[aux ; aux($,:)+e(alea(j),:)];
	end
	res=aux;
	//xmin=min(aux(:,1)); xmax=max(aux(:,1)); ymin=min(aux(:,2)) ; ymax=max(aux(:,2));
	//isoview(xmin,xmax,ymin,ymax);
	//plot(aux(:,1),aux(:,2))
	//x=0:0.1:8;
	//plot(sqrt(N)*cos(x),sqrt(N)*sin(x))
endfunction