Hi, I have a doubt in plotting the vector field. In the post https://www.physicsforums.com/showthread.php?t=155579 it is mentioned that a vector field could be plotted for F (x,y) by, marking the (x,y) as the tail and F(x,y) as the head portion. If so, then consider the function, F(x,y)=(x,y) The, if the input is (2,4) then output is (2,4) Then, if it plotted, there will be only points everywhere right? Because, the head and the tail portion is marked at the same point. But, when I tried the same using a online plotter (http://cose.math.bas.bg/webMathematica/MSP/Sci_Visualization/VectorField [Broken]) , I got a different result, which I have attached.