Quiver scale variables differently?

Question

JEC PsiCom 2011-5-23

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评论： Francois Clemens 2019-4-21

Hello. I have this problem.

I have two different types of flux/velocity variables (in u and v) that I want to compare using a quiver plot. The problem is that one of the variables is scaled a LOT bigger than the other variable, no matter the actual physical values it has. For examplem, if I force it smaller by multiplying by 0.001 or something, it STILL shows these huge arrows. That is, variable 2 has longer quiver arrows than variable 1 even though the values it has is smaller.

ps; I've tried to set 'autoscaling','off', but it doesn't help.

What's going on? :/

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Oleg Komarov 2011-5-23

Post code and input examples: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

and format the code: http://www.mathworks.com/matlabcentral/answers/7885-tutorial-how-to-format-your-question

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Answer 1

Sean de Wolski 2011-5-23

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Two ideas:

Use the scale input to quiver

doc quiver

Normalize the arrows to be the exact same range:

u2 = u2./(max(u2(:))).*max(u1(:));

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Answer 2

Tim Whiteley 2017-11-13

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Hello. I am having the same problem as JEC PsiCom. Here is an example of some toy code where x and y are different scales. When plotted, the y scale of the arrowheads is hugely disproportional (the vertical lines being the arrowheads). Any help would be much appreciated.

x=-10:10;

y=0.00001:0.00001:0.00010;

[X,Y]=meshgrid(x,y);

quiver(x,y,X,Y);

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Francois Clemens 2019-4-19

Hi I have something similar, although in my case he variabale on th y-axis is scaled:

when I give the command:

quiver(r,dr,vradiaal,dvrad);

I get the graph with the blue arrows:

WhenI I plot using the command:

p1=[r,r+dr];

p2=[vradiaal,vradiaal+dvrad];

plot(p1,p2,'-k');

I get the graph in black, Tthe numerical values correspond with the graph in black so clearly the y axis is scaled down by quiver by a factor of approx 100. Anybody an idea????

thanks in advance

Francois Clemens

P.S. I'm using Matlab R 2017b