MATLAB: How i can have 2 points joining with quiver

quiver

Hello.I want to make a velocity vector from a point (i,j) to a point(k,z) on an image.How i can use quiver for it? Thanks

annotate()

'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');

Run this code:

figure 
plot(1:100,(1:100).^2,'b')
axes('pos',[.3 .5 .3 .3])
I = imread('eight.tif');
imshow(I)