Creating a vector field

Hello everybody,

I am trying to create a vector field. The vector at each point is combined out of two others.

I tried

[x,y] = meshgrid(-2:.2:2,-2:.2:2) ; to create the points I want to take a look at

VectorX = [x./(2*pi*(x.^2+y.^2)),0]; is the Vector in the "x" direction

VectorY = [0,y./(2*pi*(x.^2+y.^2))]; is the Vector in the "y" direction

Vectortoplot = [(x./(2*pi*(x.^2+y.^2))),(y./(2*pi*(x.^2+y.^2)))];

quiver(x,y,Vectortoplot)

But all I get is an empty coordinat system form 0 to 1 in 0.1 steps in each direction. I am a little confused.

If you could help me, I would be very thankful.

[Jan]

Please learn how to format code in the forum. Inserting white lines does not look fancy.

[Johannes]

I know, i am new in matlab, and this was the fastest way for me.

I will try to do that in the future, however i would be thankful for some help

Answer 1

[Babak]

I don't know why you put a zero at the end of VectorX and a zero at the beginning of VectorY which makes those lines incorrect.

Your usage of quiver doesn't seem to be proper either. quiver needs 4 inputs. See

 doc quiver

on that.

Here's what I ran:

 [x,y] = meshgrid(-2:.2:2,-2:.2:2) ; %to create the points I want to take a look at

 VectorX = [x./(2*pi*(x.^2+y.^2))]; %is the Vector in the "x" direction

 VectorY = [y./(2*pi*(x.^2+y.^2))]; %is the Vector in the "y" direction

 Vectortoplot = [(x./(2*pi*(x.^2+y.^2))),(y./(2*pi*(x.^2+y.^2)))];

 % size(x)
 % size(y)
 % size(VectorX)
 % size(VectorY)

 quiver(x,y,VectorX,VectorY)

[Sara]

Hi, I want to ask you about the answer,

why you used

(2*pi*(x.^2+y.^2))

this is the circumference of the circle.

[Rupchand Sutradhar]

how can I set the length of arrow ?

[Nitin Phadkule]

quiver(x,y,VectorX,VectorY,0)

add 0