Change direction of the Y-axis for a single figure

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Alberto Acri
Alberto Acri 2022-11-1
评论： Constantino Carlos Reyes-Aldasoro 2022-11-1
I have the following code:
figure();
% BLACK CURVE plot
open_jpg = imread('fig_01_JPG.jpg');
image(open_jpg);
axis equal
xlim([90 190]);
ylim([210 320]);
set(gca, 'YDir','normal')
hold on
% BLUE CURVE plot
Im = imread('fig_01_JPG.jpg');
CoordinateMatrix = pic2points(Im);
scatter(CoordinateMatrix (:,1), CoordinateMatrix (:,2),'.');
% ax = gca;
% ax.YDir = 'reverse'
% set(gca, 'YDir','normal')
hold off
I would like to change ONLY the direction of the Y axis of the figure with the black curve so that it overlaps exactly with the blue curve of the other figure.
I tried using the "reverse" or "normal" command but it only applies it to the global figure.
% ax = gca;
% ax.YDir = 'reverse'
% set(gca, 'YDir','normal')

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回答（1 个）

Constantino Carlos Reyes-Aldasoro
  2 个评论
Alberto Acri
Alberto Acri 2022-11-1
@Constantino Carlos Reyes-Aldasoro
I actually have to invert the image with the black curve (in this case flip along the x-axis) so that the image with the black curve is equal to the blue curve. By rotating the image with the black curve I do not get the desired result :)
Constantino Carlos Reyes-Aldasoro
Constantino Carlos Reyes-Aldasoro 2022-11-1
Have you tried
maxV = max(CoordinateMatrix (:,2));
scatter(CoordinateMatrix (:,1), maxV - CoordinateMatrix (:,2),'.');
This may work.

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