Hi Ferry,
You can use the built-in Data Cursor tool in MATLAB to display custom information when hovering over data points on a plot.
Here's an example for the same,
% First, create a sample plot with multiple data series
figure;
x = linspace(0, 2*pi, 100);
y1 = sin(x);
plot(x, y1, 'r', 'DisplayName', 'sin(x)');
hold on
y2 = cos(x);
plot(x, y2, 'b', 'DisplayName', 'cos(x)');
hold off
legend('show')
% Next, create a data cursor object and update its properties
dcm = datacursormode(gcf);
set(dcm, 'UpdateFcn', @myupdatefcn)
% Define a custom update function that displays the legend name
function output_txt = myupdatefcn(~, event)
% Extract the data index and the x and y values
idx = event.DataIndex;
x = event.Position(1);
y = event.Position(2);
% Extract the legend name for the corresponding series
leg = event.Target.DisplayName;
% Create a cell array with custom display text
output_txt = {['Series:', leg], ['X:', num2str(x)], ['Y:', num2str(y)]};
end
Here, I have used sin and cosine plot for demonstration. This code first creates a sample plot with two data series and a legend. It then creates a Data Cursor object on the figure and defines a custom UpdateFcn function that will be executed whenever you hover over a data point on the plot.
The UpdateFcn function takes two arguments: the Data Cursor object and an event object containing information about the current data point. The function uses event.DataIndex to extract the index of the current data point, and event.Position(1) and event.Position(2) to extract the x and y values. It then uses event.Target.DisplayName to extract the legend name of the corresponding data series.
Finally, the function creates a cell array output_txt containing the custom display text, which is displayed when you hover over a data point on the plot.
Hope this helps!
