MATLAB: How to select data from a quiver plot

brushMATLABplotquivervariable

I have position (x,y) and velocity (u,x) data plotted as a quiver plot. I would like to select only a subset of the data to analyze. Ideally, this would be done with the brush and then saving the brushed data to a variable. However, the brush tool does not work with quiver. What's a useful workaround?

Best Answer

quiver(x,y,u,v), hold on
plot(x,y,'*'), brush on

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MATLAB: Quiver plot

'unode' is not a defined quiver group property, it's a vector of u-velocities that you're feeding into quiver. quiver properties are available here:

docsearch quivergroup properties

From that document it appears you want 'udata'

a = get(hQ,'udata');

MATLAB: How to track the vector magnitude in quiver plot

If you use quiver(x,y,u,v), the data cursor mode will show the (x,y,u,v) value for every point that is plotted. I guess you want the value of sqrt(u^2+v^2). That is not available in the plot. If you want to have that, you need to plot it somewhere in the figure.

use quiver(x,y,u,v,scale) to adjust the length of the arrow line.

Follow Doug's video tutorial to create a customized data cursor function. http://blogs.mathworks.com/videos/2011/02/25/creating-a-custom-data-cursor/

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MATLAB: How to track the vector magnitude in quiver plot

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