ginput and plot data

Hi, i have a question:

When i click near of a pointF (pointF is a point that belongs to the function plotted on the graph), is there a way that "ginput" gives me that pointF?

Example: "ginput" gives me (37.8, 251.3), but the point that belongs to the function plotted is (38, 250), i need that "ginput" gives me (38,250) when i click on (37.8, 251.3)

Regards, and sorry for my Tarzan english xD

Answer 1

[Sean de Wolski]

minimum absolute differences kick in again:

xx = 1:10; %xdata
yy = exp(xx);

plot(xx,yy);
[xm ym] = ginput(1); %xmouse, ymouse

%Engine
[~, xidx] = min(abs(xx-xm)); %closest index
[~, yidx] = min(abs(yy-ym));
x_closest = xx(xidx) %extract
y_closest = yy(yidx)

[Pablo]

*.*, you're my hero! xD

Thanks a lot ;)

[Yunus]

Hello Mr .Sean de Wolski ;

i have a problem about this topic please help me. so my problem is how can i obtain selected points pixels index .for example i have rgb picture and i want to selecet particular place with mause and i want to get picture's pixel values.

Thans for helping.

[Chad Greene]

Yunus: clickz do what you want?

[Sean de Wolski]

Or impoint

Answer 2

[Stefano Dalla Gasperina]

% plot x,y
plot(x,y)

% ginput 10 points
plot(y)
[index,~] = ginput(10);

% plot again
figure();
plot(x(round(index)),y(round(index)));