Plot 2D vector field

Question

Emerson De Souza 2011-5-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/8474-plot-2d-vector-field

编辑： Dyuman Joshi 2023-12-6

采纳的回答： Walter Roberson

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

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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......?

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Answer 1

Walter Roberson 2011-5-31

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/8474-plot-2d-vector-field#answer_11674

Sounds like you are looking for quiver

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Walter Roberson 2011-5-31

quiver(T(:,1),T(:,2),T(:,3),T(:,4))

Emerson De Souza 2011-6-2

Thank you Walter

Wish you a nice night

Emerson

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Answer 2

Brijesh 2023-12-6

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/8474-plot-2d-vector-field#answer_1366519

在 MATLAB Online 中打开

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;