MATLAB: How to plot reference arrow in quiver plot arrowquiver Hi all, I have a quiver plot that I want to plot a reference arrow on it? as the attachment shows. could anyone help? thank you Best Answer I would just add an extra arrow of given length to the vector field:% random array of vectorsx=[1:6]; y=[1:5];u = rand(numel(y),numel(x));v = rand(numel(y),numel(x));% create an extra entry for the reference arrowx = [x max(x)+1];u = [u NaN(numel(y),1)]; u(1,end) = 1;v = [v NaN(numel(y),1)]; v(1,end) = 0;figurequiver(x,y,u,v)text(max(x),1,'1 m/s','verticalalignment','bottom') Related SolutionsMATLAB: No Arrows showing in plot When using quiver As the grid starts from 0 and you have used this zero in the reciprocal to get (u,v) you will get inf in the u,v.; quiver uses maximum value of u and v to scale the arrows and plot. Try to repalce inf with some other value or avoid zero. [x,y] = meshgrid(1:0.2:5,1:0.2:5);u = 2./x;v = 2.*y./(x.^2);figurequiver(x,y,u,v,1,'r') MATLAB: Quiver plotting arrow length Two things:(1) It looks like you swapped the u and v arguments compared to how you actually want them, so I think you actually wantquiver(x,y,u,v)(2) There is an automatic scaling that occurs to the arrow (which is described in the documentation). You can turn off that scaling:quiver(x,y,u,v,0)I believe that will result in the plot you expect. Related QuestionHow to increase Quiver_tri arrow length
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