Quiver vector length difficulty

Question

David Arnold 2018-1-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378151-quiver-vector-length-difficulty

回答： Star Strider 2018-1-20

I've written this:

[T,Y]=meshgrid(-4:0.5:4,-4:0.5:4);
S=-(2-Y).*Y;
L=sqrt(1+S.^2);
quiver(T,Y,1./L,S./L)
axis tight
shg

And all the arrows are the same length. But when I try this:

t=linspace(-2,2,16);
y=linspace(-4,4,16);
[T,Y]=meshgrid(t,y);
S=Y./T+3*T;
L=sqrt(1+S.^2);
quiver(T,Y,1./L,S./L,0.5)
axis tight

The arrows are not all the same length. Am I doing something wrong or are there suggestions? I am using Matlab R2017b.

Thanks

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2018-1-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378151-quiver-vector-length-difficulty#answer_301034

Specifying 0.5 as the scale factor simply halves their lengths. it does not remove scaling. If you want them not scaled, use 0 for the scaling factor. (I do not know what effect that would have in your plot, because it apparently requires that you interact with the GUI to adjust their lengths afterwards.)

See the documentation for quiver (link) and Quiver Properties (link) for details.