- Adjust the 'VerticalAlignment' and 'HorizontalAlignment' properties in the text command to better position your annotations relative to the extrema points.
- Use sprintf to format the text string with the coordinates.
- If dealing with complex functions or large datasets, consider using numerical methods or built-in functions like findpeaks for more sophisticated extrema detection.
How to write a point's coordinates
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How can I write coordinates of my extrema on a figure?
I tried using "text" command but I stiil can't deal with the problem
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Answers (1)
Nihal
on 12 Jun 2024
To write the coordinates of extrema (maximum and minimum points) on a figure in MATLAB, you can indeed use the text command effectively. Here's a step-by-step guide on how to identify the extrema of a given dataset or function and then annotate these points on a figure.
Let's assume you have a simple dataset or a function for which you want to find and annotate the extrema. I'll provide examples for both scenarios.
For a Dataset
Assuming you have x and y vectors representing your data.
x = 1:10; % Example x data
y = [2 3 1 5 6 4 7 8 6 9]; % Example y data
% Find the indices of the min and max
[ymax, imax] = max(y);
[ymin, imin] = min(y);
% Plot the data
plot(x, y, '-o'); % Plot with markers at each data point
hold on; % Keep the plot for further plotting
% Annotate the max
text(x(imax), ymax, sprintf('Max: (%d, %d)', x(imax), ymax), 'VerticalAlignment', 'bottom', 'HorizontalAlignment', 'right');
% Annotate the min
text(x(imin), ymin, sprintf('Min: (%d, %d)', x(imin), ymin), 'VerticalAlignment', 'top', 'HorizontalAlignment', 'right');
hold off; % Release the plot
Tips
This should help you annotate the extrema on your figures effectively. If you encounter any specific issues, please provide more details about the problem you're facing. I hope it helps.
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