Plot 2D vector field

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Emerson De Souza
Emerson De Souza 2011-5-31
编辑： Dyuman Joshi 2023-12-6
Hi
I have a table T of four columns x,y,u,v,
where x and y are the coordinates
and u and v are the values of the x and y components, respectively.
Thus, T represents a two-dimensional vector field.
For example, let
T=
1 3 -1 -1
1 4 0.500000000000000 -0.500000000000000
2 3 -0.250000000000000 0.250000000000000
2 4 0.100000000000000 0.100000000000000
I want to plot a 2-D vector field from this table!!!
I tried using the function:
coneplot(T)
but became the following error message:
??? Error using ==> coneplot>parseargs at 365
Wrong number of input arguments.
Error in ==> coneplot at 64
[x y z u v w cx cy cz s color quiv method nointerp] =
parseargs(nargs,args);
It seems that coneplot works only for 3-D.
Can someone tell me how to change this command line?
Thank you
Emerson
  1 个评论
Qiujie Meng
Qiujie Meng 2019-4-2
移动：Dyuman Joshi 2023-12-6
Hello , Emerson De Souza:
This is my code:
%%%%%%%%%%%%%%%%%%
close all;clc;clear all;
velocity=load('velocity100POINTS.txt');
x=velocity(:,1);
y=velocity(:,2);
u=velocity(:,3);
v=velocity(:,4);
figure
quiver(x,y,u,v)
%%%%%%%%%%%%%%%%%%%%%
Although my file has vectors,why the figure is like that......?
QQ截图20190402211109.png
QQ截图20190402211333.png

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采纳的回答

Walter Roberson
Walter Roberson 2011-5-31
Sounds like you are looking for quiver
  3 个评论
显示 1更早的评论
Walter Roberson
Walter Roberson 2011-5-31
quiver(T(:,1),T(:,2),T(:,3),T(:,4))
Emerson De Souza
Emerson De Souza 2011-6-2
Thank you Walter
Wish you a nice night
Emerson

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更多回答（1 个）

Brijesh
Brijesh 2023-12-6
Ran in:
clc
clear all
syms x y
f = input('Enter:');
Unable to run the 'fevalJSON' function because it calls the 'input' function, which is not supported for this product offering.
p = inline(vectorize(f(1)),x,y);
q = inline(vectorize(f(2)),x,y);
x = linspace(-1,1,10);
y = x;
[X, Y] = meshgrid(x,y);
U = p(X,Y)
V = q(X,Y)
quivert(X,Y,U,V,1)
axis on;
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-12-6
编辑：Dyuman Joshi 2023-12-6
@Brijesh, how exactly does your answer answers the question asked, that too 12 years ago and with an accepted answer.
There is no function as quivert and using inline and vectorize is not recommended.

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