Quiver vector length difficulty

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David Arnold
David Arnold 2018-1-20
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

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回答（1 个）

Star Strider
Star Strider 2018-1-20
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.

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