Hello! How can i delete a line from my figure?

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Stany Stone 2019-12-28

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https://ww2.mathworks.cn/matlabcentral/answers/498317-hello-how-can-i-delete-a-line-from-my-figure

评论： Stany Stone 2019-12-30

Hello! I have an image from which i would like to delete a line. How can i do that? When i use the delete() function it does not work. There is no error mentioned nor is the image changing.

Please help!

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Image Analyst 2019-12-28

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https://ww2.mathworks.cn/matlabcentral/answers/498317-hello-how-can-i-delete-a-line-from-my-figure#answer_407998

在 MATLAB Online 中打开

This should work

hLine = line(x, y, 'Color', 'r', 'LineWidth', 2);
% Now delete it.
delete(hLine);

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Stany Stone 2019-12-29

在 MATLAB Online 中打开

Thank you! But if my code is like this:

                     xKnown - halfLineLength*cos(perTheta)];
yPerKnown = [yKnown + halfLineLength*
sin(perTheta), ...
                   yKnown - halfLineLength*sin(perTheta)];
% calculate the ends points of another newL based on the Unknown points of oldL
xPerUnknown = [xUnknown + halfLineLength*cos(perTheta), ...
                      xUnknown - halfLineLength*cos(perTheta)];
yPerUnknown = [yUnknown + halfLineLength*sin(perTheta), ...
                      yUnknown - halfLineLength*sin(perTheta)];
% draw these two newL
plot([xPerKnown(1), xPerKnown(2)], [yPerKnown(1), yPerKnown(2)], 'o-', ...
  'Color', darkGreen, 'MarkerSize', 24, 'LineWidth', 3);
plot([xPerUnknown(1), xPerUnknown(2)], [yPerUnknown(1), yPerUnknown(2)], 'o-', ...
  'Color', darkGreen, 'MarkerSize', 24, 'LineWidth', 3)

Then it means that i have to use the hLine=findobj() immediately after the plot of the line i want to delete? And, in this case, the thing that makes the line unique isn't about the width or the color. What should i put in the parantheses to differentiate the one i want?

Walter Roberson 2019-12-29

Yes, recording the handle will always be a better solution rather than findobj when it can be done. Sometimes though you are wanting to delete a line from a plot created by code you do not have control of, or from a stored fig that you cannot change the generation code for, and in those cases you would use findobj or findall

Stany Stone 2019-12-30