add xy coordinates to a graph

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maryam 2013-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/88795-add-xy-coordinates-to-a-graph

评论： Image Analyst 2019-8-22

hi, i have a graph like this picture, local maxmimus are shown with red points, but i also would like to show the related xy coordinates on graph by adding commands to existing code,not with data curser. please help me if you can

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Image Analyst 2013-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/88795-add-xy-coordinates-to-a-graph#answer_98371

在 MATLAB Online 中打开

Do you mean you just want to put a text label near it?

indexToLabel = 42; % or whatever.
textString = sprintf('x = %.2f, y = %.2f', x(indexToLabel), y(indexToLabel));
text(x(indexToLabel), y(indexToLabel), textString);

Adjust the x, and y as necessary in text() to move the location of the label.

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Sean Haines 2019-8-22

how would you add a \r to this label?

Image Analyst 2019-8-22

在 MATLAB Online 中打开

Put \n into the string:

numPoints = 20;
x = sort(rand(1, numPoints));
y = rand(1, numPoints);
plot(x, y, 'b.-', 'MarkerSize', 25);
grid on;
[~, indexToLabel] = max(y); % label the highest point, or whatever you want.
textString = sprintf('x = %.2f\ny = %.2f', x(indexToLabel), y(indexToLabel));
text(x(indexToLabel), y(indexToLabel), textString, 'FontSize', 20, 'Color', 'r');