how to graph vector fields containing scalar

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수정 이
수정 이 2020-11-14
评论： VBBV 2024-8-2
I'm trying to graph some vector fields .
F(x,y,z)-<1,2,z>
F(x,y)=<0.3, -0,4)
my code is look like this
>> [x,y,z]=meshgrid(-2:2,-2:2,-2:2);
>> u=1;
>> v=2;
>> s=z;
>> quiver(x,y,z,u,v,s)
Second one is similar.
>> [x,y,]=meshgrid(-2:2,-2:2);
>> u=0.3;
>> v=-0.4;
>> quiver(x,y, u,v )
I tried to use ones(size(v)) function but it doens't work.
Any help would be helpful. Thank you

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回答（1 个）

Monisha Nalluru
Monisha Nalluru 2020-11-17
quiver used to for vector plot
The input arguments X,Y,U,V all should be of same size
In the above problem u,v should be same size of x,y
As an example
[x,y,]=meshgrid(-2:2,-2:2);
u=ones(size(x));
v=ones(size(x)) * 2;
quiver(x,y,u,v)
And inorder to increase the arrow length use scale argument
quiver(x,y,u,v,2) % scale the arrow length to 2 units
  1 个评论
VBBV
VBBV 2024-8-2
Ran in:
@수정 이 In first case, it is a 3D plot , so you require quiver3 plot instead of 2D quiver function
[x,y,z]=meshgrid(-2:2,-2:2,-2:2);
u=ones(size(x));
v=ones(size(x)) * 2;
w = z;
s = 'r'; % color
quiver3(x,y,z,u,v,w,s)

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