Select 100 points either side from mouse click cooradinates

x = linspace(0,1) ; 
y = sqrt(x) ; 
% Mid point
M = [mean(x) mean(y)] ; 
% points left side 
idx1 = x<M(1) ; 
% % points right side 
idx2 = x>M(1) ;
figure
hold on
plot(x,y,'r') ; 
plot(x(idx1),y(idx1),'.b')
plot(x(idx2),y(idx2),'.g')
legend('data','left points','right points')

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Answer 2

Rik 2019-6-13

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/466893-select-100-points-either-side-from-mouse-click-cooradinates#answer_379021

在 MATLAB Online 中打开

Use the x-coordinate returned by getpts to select the data.

x=linspace(0,10,1000);
%generate a smooth random curve
y=sin(x)+polyval([0.01 0.1 1 10].*rand(1,4),x);
figure(1),clf(1)%only use clf during debugging
plot(x,y,'b','DisplayName','Data')
[xp,yp]=getpts;
if numel(xp)<1
    clc,error('no points selected')
else
    xp=xp(1);
end
pos_left=find(x<xp,100,'last');%might not return 100 points
pos_right=find(x>xp,100,'first');%might not return 100 points
hold on
plot(x(pos_left),y(pos_left),'.r','DisplayName','Left of click')
plot(x(pos_right),y(pos_right),'.g','DisplayName','Left of click')
hold off
legend