connect lines on scatter plot showing arrows

Hi,

I am plotting 2 scatter plots on the same figure with corresponding points. I would like to connect each pair of points with an arrow towards the second. Here is my code so far

figure; scatter(xpre,ypre,'filled','SizeData',100,'MarkerEdgeColor',[0 0 0],'MarkerFaceColor',[.4940 .1840 .5560]);hold on;scatter(xpost,ypost,'filled','SizeData',100,'MarkerEdgeColor',[.9290 .6940 .1250],'MarkerFaceColor',[.9290 .6940 .1250]);hold on

for i = 1:22

plot([xpre(i,:) xpost(i,:)],[ypre(i,:) ypost(i,:)],'-->','Color',[0 0 0],'LineWidth',2);

end

However I get the attached figure. Grateful for any assistance. Thank you!

Answer 1

[Bruno Luong]

Try this

quiver(xpre, ypre, xpost-xpre, ypost-ypre, 'off')

[bsriv]

Thanks- I'm getting this error

Error using quiver (line 44)

Uneven parameter-value pairs.

Not sure why... Thanks

[Bruno Luong]

You might have an older MATLAB, replace 'off' with 0, or ..., 'AutoScale', 'off'). In any case check the doc of your quiver command.

[bsriv]

Thanks- it works but i can't reshape the arrows/arrowheads. It's not really clear from the documentation how do I narrow the arrowheads and make them so they don't overlap with the points?

[Bruno Luong]

Make thr arrow 10% shorter

quiver(xpre, ypre, 0.9*(xpost-xpre), 0.9*(ypost-ypre), 'Autoscale', 'off')

[bsriv]

Thanks- but I can't figure out how to reshape the arrowheads themselves (i.e., make them smaller )

[Bruno Luong]

This is beyond the question you ask, but I'll be nice to do somethibg you could figure out on your own that there is somethig call 'MaxHeadSize'

https://fr.mathworks.com/help/matlab/ref/matlab.graphics.chart.primitive.quiver-properties.html

[bsriv]

thanks!