make dot and count them

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Rahma Yeni 2012-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/35280-make-dot-and-count-them

采纳的回答： Thomas

how to make dots (points) in an axes and count them.. may I use "ginput".. how i can make it..?? thank you.. ^^

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Rahma Yeni 2012-4-12

I would prefer to explain it in pictures

http://www.flickr.com/photos/rye_ni/7070715047/

thank you before.. ^^

Jan 2012-4-12

How do you "make some dots in an axes"? Isn't it possible to count the dots during creation already?

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采纳的回答

Thomas 2012-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/35280-make-dot-and-count-them#answer_44217

在 MATLAB Online 中打开

Is this what you want

E.G.

close all
  clear variables %changed from clear all on Jan's suggestion
   disp('Hit return (enter) to stop entering points');
    [x,y]=ginput;  % hit return(enter) to stop entering points
    plot(x,y,'MarkerFaceColor',[0 0 0],'MarkerEdgeColor',[0 0 0],'Marker','o','LineStyle','none');
  num_points=(length(x))

@Thomas, I would not have mentioned the problems of "clear all", if this appears less frequently in this forum. It does not cause any problems in your example. But I see it in so many examples, even as first line inside functions -where it is even weird-, that I suggest repeatedly to avoid it. A lot of FEX submissions contain "clear all, close all" and testing them can destroy my current work.

Rahma Yeni 2012-4-13