How do I label my data points with the corresponding index/x-co​ordinate/y​-coordinat​e?

How do I label my data points with the corresponding index/x-coordinate/y-coordinate?

Answer 1

[MathWorks Support Team]

The following pieces of code will demonstrate two examples of how this might be done.

This example labels the data points with their corresponding x-coordinate values.

% Define x and y

x = (5:30);

y = sin(x);

% Open a new figure

figure;

% Turn hold on so all the points can 

% be plotted individually

hold on;

% Calculation for the amount by which the

% label should be displaced in the 'y'

% direction

lbl_dwn = .1*max(y);

% plot and label the individual points

for i = 1:length(x)

     plot(x(i),y(i),'r+');

     % Label the points with the corresponding 'x' value

     text(x(i),y(i)+lbl_dwn,num2str(x(i)));

end

This example labels the data points with the corresponding index of the element.

% Define x and y

x = (5:30);

y = sin(x);

% Open a new figure

figure;

% Turn hold on so all the points can 

% be plotted individually

hold on;

% Calculation for the amount by which the

% label should be displaced in the 'y'

% direction

lbl_dwn = .1*max(y);

% plot and label the individual points

for i = 1:length(x)

     plot(x(i),y(i),'r+');

     % Label the points with the index

     text(x(i),y(i)+lbl_dwn,num2str(i));

end