Labeling points of plot()

Question

naga240 2023-1-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1888412-labeling-points-of-plot

回答： Cameron 2023-1-4

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!

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Answer 1

Cameron 2023-1-4

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1888412-labeling-points-of-plot#answer_1141467

在 MATLAB Online 中打开

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));