Labeling points of plot()

I have the following code using eigenshuffle.

%% 2a)
a=-2:0.01:6;
A2=zeros(2,2,length(a));

for i=1:length(a)
  A2(:,:,i)= ([0 1; -a(1,i) -1]);
end

[V,E]=eigenshuffle(A2)

Unrecognized function or variable 'eigenshuffle'.

E_real=squeeze(real(E))
E_imag=squeeze(imag(E))

hold on
grid on
axis equal
plot(E_real(1,:),E_imag(1,:))
plot(E_real(2,:),E_imag(2,:))

I want to label each point of the data such that when I click on the line i can also see the value of a. Sort of how nyquist works:

Thanks in advance!

Answer 1

[Cameron]

For a regular plot, you can use the Data Tips icon on the axtoolbar to manually select the points you want to view. To do it programatically, you would need to use the function datatip.

x = 0:20;
y = x.^2;
p = plot(x,y);
datatip(p,x(10),y(10));

or if you want to add custom information, you can use dataTipTextRow

x = 0:20;
y = x.^2;
str = "Value #" + (0:20)';
p = plot(x,y);
row = dataTipTextRow('ID',str);
p.DataTipTemplate.DataTipRows(end+1) = row;
datatip(p,x(10),y(10));