Make a point move up and down

Question

SS 2020-8-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/576700-make-a-point-move-up-and-down

评论： SS 2020-8-8

I am trying to code for a point inserted on an image that is stationary on the x direction but is moving up and down in the y direction. I have set px = 0 but I am not sure what to do about py.

Here is what I have:

x = 0:.01:20; %linspace of x
y = sin(x); %wave equation
px = 0; %initial x plot 
py = 0; %initial y plot
img =imread('AvgBscan.tiff'); %read in image 
for i=1:100 %loop
    imshow(img);
    set(gcf,'DoubleBuffer', 'on');
    h = patch([0 1 0 1], [0 1 1 0], 'r');
    hold on
    figure(100); %so code will replot over the previous figure, and not make a new one.
    hold off
    plot(x,y, px, py,'o'); %circle point
    pause(0.02); %speed of moving point
    px = 0; 
    py = sin(px); %get that point to move
end

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Answer 1

Walter Roberson 2020-8-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/576700-make-a-point-move-up-and-down#answer_476782

在 MATLAB Online 中打开

x = 0:.01:20; %linspace of x
y = sin(x); %wave equation
px = 0; %initial x plot 
py = 0; %initial y plot
img =imread('AvgBscan.tiff'); %read in image 
for i=1:100 %loop
    imshow(img);
    set(gcf,'DoubleBuffer', 'on');
    h = patch([0 1 0 1], [0 1 1 0], 'r');
    hold on
    figure(100); %so code will replot over the previous figure, and not make a new one.
    hold off
    py = y(i);
    plot(x,y, px, py,'o'); %circle point
    pause(0.02); %speed of moving point
end