How can you get the x and y values from plotted points on a quiver plot?

I have quiver plots in which I used longitude and latitude for x and y and vectors that are u and v. I was wondering if there is anyway to extract all of these points in Matlab. I know code below gives me a range, but I want the specific x and y values and the corresponding u and v. I want these values so I can compare and receive more information from another data set

xLimits = get(gca,'Xlim');
yLimits = get(gca,'Ylim');

Answer 1

[Greg Dionne]

You'll want to get the line handle.

Something like:

>> hq = quiver([1 2 3],[3 1 2],[4 1 5],[2 1 2])

hq = 

    Quiver with properties:

        Color: [0 0.4470 0.7410]
    LineStyle: '-'
    LineWidth: 0.5000
        XData: [1 2 3]
        YData: [3 1 2]
        ZData: []
        UData: [4 1 5]
        VData: [2 1 2]
        WData: []

Once you have the handle, you can reference the properties either via "get" or direct property access:

>> get(hq, 'XData')

ans =

     1     2     3

In more recent versions of MATLAB you can use direct property access:

>> hq.XData

ans =

     1     2     3

Don't have the handle? You can search for it:

>> hq = findobj(gca,'Type','quiver')

hq = 

    Quiver with properties:
        Color: [0 0.4470 0.7410]
    LineStyle: '-'
    LineWidth: 0.5000
        XData: [1 2 3]
        YData: [3 1 2]
        ZData: []
        UData: [4 1 5]
        VData: [2 1 2]
        WData: []

[Sancheet Hoque]

This information is really helpful, but since there is a lot of NaN values not everything is plotted. I was thinking that maybe I could get the only ones that were plotted and avoid the NaN, but using this method still gives the values that weren't plotted (aka the NaN values)

Also I apologize for the late response.

[Greg Dionne]

If you want to find all the values that aren't NaN, you can do something like:

x = hq.XData;
y = hq.YData;
u = hq.UData;
v = hq.VData;

% get rid of any nan
idxgood = ~(isnan(x) | isnan(y) | isnan(u) | isnan(v));
x = x(idxgood);
y = y(idxgood);
u = u(idxgood);
v = v(idxgood);

Not sure if that's what you meant, but give it a whirl and let us know.

[Sancheet Hoque]

THANK YOU so much, I should've asked here from the beginning instead of straining my brain!

Answer 2

[Chad Greene]

If you can get a handle from when the quiver plot was created, it's easy:

[x,y] = meshgrid(0:0.2:2,0:0.2:2);
u = cos(x).*y;
v = sin(x).*y;
h = quiver(x,y,u,v);

then the x data can be obtained by

X = get(h,'Xdata');

and the y data is obtained by the same method. If you don't already have a handle for the quiver plot, you can try to find it by

get(gca,'Children')