How to display coordinates of points in "contourf"?

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Ali Baig 2018-8-6

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https://ww2.mathworks.cn/matlabcentral/answers/413713-how-to-display-coordinates-of-points-in-contourf

回答： Afshin Aghayan 2019-10-8

采纳的回答： jonas

在 MATLAB Online 中打开

I have three matrices, X, Y, and Z. I am creating a filled contour plot using the command

contourf(X,Y,Z)

How can I display the coordinates of all points in the plot? I can use "Data Cursor" in figure environment to mark coordinates of points individually but this may take a lot of time depending on the number of points.

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jonas 2018-8-6

Still unclear. Do you want to overlay the contourf with a grid showing all coordinates, like [x1,y1]? All coordinates included?

Ali Baig 2018-8-6

Yes! this is exactly what I want to do. Thank you!

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jonas 2018-8-6

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编辑：jonas 2018-8-6

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It's going to look real messy when you have high resolution x and y data.

%%Some data
[x,y,z]=peaks(20);
[~,c]=contourf(x,y,z);hold on
set(gca,'XTick',[],'YTick',[]);
%%Create cell array with coordinates
C = reshape([x(:)'; y(:)'], [], 1)';
str=sprintf('[%.2g;%.2g],',C);
str=strsplit(str,',')
str(end) = [];
%%Plot labels
text(x(:),y(:),str(:),'fontsize',6,'horizontalalignment','center','verticalalignment','mid')

Or alternatively, with the undocumented sprintfc (courtesy Walter Roberson)

%%Same code as above, until:
str=sprintfc('[%.2g;%.2g]',C);
text(x(:),y(:),str(:),'fontsize',6,'horizontalalignment','center','verticalalignment','mid')