1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Doubt in plotting Vector Fields !

  1. Dec 6, 2012 #1
    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.
     

    Attached Files:

    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Dec 6, 2012 #2

    Mark44

    Staff: Mentor

    Right.
    It might be that the online graphing software doesn't handle zero vectors correctly.
     
    Last edited by a moderator: May 6, 2017
  4. Dec 6, 2012 #3

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    No, that's not what I said. I said:
    You are confusing points and vectors. If you use (x, y) to mean both the point (x,y) and the vector from point (0,0) to (x,y) then you are going to be confused! Since you learned to use (x, y) to mean a point way back in "pre-Calculus", it is better to use either <x, y> or xi+ yj to denote the vector. Then F(x, y)= <x, y> or, better, F(x, y)= xi+ yj. F(2, 4)= 2i+ 4j. With its "tail" at (2, 4), its head would be at (2+2, 4+ 4)= (4, 8).

     
    Last edited by a moderator: May 6, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Doubt in plotting Vector Fields !
  1. A doubt (Replies: 3)

  2. Normal vector fields (Replies: 2)

Loading...