  \begin{pspicture}*(-3.5,-3.5)(3.5,3.5)
      \psgrid[griddots=10, gridcolor=lightgray, subgriddiv =0](-5,-5)(5,5)

	  \psdot(0,0)
	  \uput[u](0,0){$O$}
	  \psdot(2,0)
	  \uput[u](2,0){$A$}
	  \psdot(-1,-1)
	  \uput[d](-1,-1){$B$}
	  \psdot(2,-2)
	  \uput[d](2,-2){$C$}
	  \psdot(-3,-3)
	  \uput[d](-3,-3){$D$}
	  \psdot(1,-3)
	  \uput[d](1,-3){$E$}

	  \psline{->}(-3,1)(-1,3)
	  \uput[u](-2,2){$\vec{u}$}
	  \psline{->}(-2,1)(1,2)
	  \uput[u](-0.5,1.5){$\vec{v}$}


  \end{pspicture}
