Placing annotations at specific xy coordinates
152 views (last 30 days)
Show older comments
Just wondering but I wanted to put annotations/text boxes at specific coordinates but when I read up on the page I saw that the values of x and y in the 'dim' vector must be between 0 and 1. Im just looking for a way to place 'X's at specific xy coordinates to signify that those points are no longer being considered for my calculations?? I figured annotations would be good way to accomplish that because I wanted to avoid matlab cconsidering a plotted X as an active point and therefore valid for my calculations. If you have any work arounds or suggestions Im all ears. Thanks for the help
0 Comments
Accepted Answer
Adam Danz
on 13 Sep 2019
Edited: Adam Danz
on 13 Sep 2019
Annotations are a pain to use unless the axes are normalized to 0:1. I see no reason why Matlab cannot allow users to specify the units in annotations which would make the tool a lot more useful.
"Im just looking for a way to place 'X's at specific xy coordinates to signify that those points are no longer being considered for my calculations"
That's much easier than anything annotation can do. Simply use the xy coordinates to plot "X"'s
hold on
plot(x,y,'rx')
If you wanted rectangles for whatever reason,
widthHeight = [.1,.1];
rectangle('Position', [x-widthHeight(1)/2, y-widthHeight(2)/2, widthHeight])
More Answers (3)
Olle Trollberg
on 29 Aug 2023
I recently ran into this and here is a simple way to get around it using some anonymous functions to do rescaling.
Works at least in 2022b
plot(x,y) % Create whatever plot
ax = gca;
% Define helper funcitons to normalize from axis coordinates to normalized position in figure.
xnorm = @(x)((x-ax.XLim(1))./(ax.XLim(2)-ax.XLim(1))).*ax.InnerPosition(3)+ax.InnerPosition(1)
ynorm = @(y)((y-ax.YLim(1))./(ax.YLim(2)-ax.YLim(1))).*ax.InnerPosition(4)+ax.InnerPosition(2)
annotation('textarrow',xnorm(x_in_axis_coordinates),ynorm(y_in_axis_coordinates),'string','Arrow Text');
0 Comments
Image Analyst
on 13 Sep 2019
No, not true. If you want to place annotation text onto a plot you can use text() using the x,y that's used for that plot, whatever range it might have, which can be more than 1.
Have you tried
badIndexes = .......whatever you need to do to identify "points are no longer being considered for my calculations"
hold on
plot(x(badIndexes), y(badIndexes), 'rx', 'MarkerSize', 15, 'LineWidth', 2) % Overlay big red X's
0 Comments
See Also
Categories
Find more on Annotations in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!