make dot and count them
显示 更早的评论
how to make dots (points) in an axes and count them.. may I use "ginput".. how i can make it..?? thank you.. ^^
4 个评论
Jan
2012-4-12
The question is not clear yet. How do you define where the dots appear? If you draw the plots in a program, there is no reason to count them afterwards, because the number of dots is known already.
Rahma Yeni
2012-4-12
Rahma Yeni
2012-4-12
Jan
2012-4-12
How do you "make some dots in an axes"? Isn't it possible to count the dots during creation already?
采纳的回答
Thomas
2012-4-12
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))
6 个评论
Jan
2012-4-12
Is "close all; clear all" really helpful here?! Is it ever?!
Thomas
2012-4-12
not really helpful, but try, running this code twice without the 'close all' , you'll come to know, why I put it in..
Jan
2012-4-12
I'd rather create the AXES explicitely than letting GINPUT do this implicitely and force colosing of all open figures.
"clear all" removes all loaded functions from the memory. Reading and parsing them again wastes a lot of time. Perhaps you want "clear variables".
Thomas
2012-4-12
I agree, that clear all removes all functions loaded from memory, but it is easier to type 'clear all' than 'clear variables' for small snipets of code :) .. As for the question of creating axes explicitly rather than have GINPUT create it, I would leave that up to the user.. I was just demonstrating a proof of concept based on an ambiguous question.
Jan
2012-4-12
@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
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Data Exploration 的更多信息
2012-4-12
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
