使用Matlab在散点图中自动标记 [英] Auto-Label in scatter plot using matlab

问题描述

在继续我的问题前，有了这个建议的程序:

so in continuation of my problem a while ago, having this suggested program:

%// Input
A =[
    2   1   5
    1   3   10
    1   -2  5
    0   5   25
    5   0   25
    1   1   2
    -1  -1  2]

[unqcol3,unqidx,allidx] = unique(A(:,3),'stable')
counts = sum(bsxfun(@eq,A(:,3),unqcol3.'),1)  %//'
out =[A(unqidx,:) counts(:)]
scatter(out(:,3), out(:,4))

因此它将生成一个数组和一个像这样的图:

so it will generate an array and a plot like this:

     a     b     d     counts
     2     1     5     2
     1     3    10     1
     0     5    25     2
     1     1     2     2

d与计数

但是我想在每个散点上放置(a，b)作为标签，所以我想把这个图放出来:

but i want to put (a,b) as a labels on each scatter point, so this the plot out put i want:

如您所见，相应的a，b将在每个散点上自动标记，请帮助谢谢.

so as you can see the corresponding a,b will automatically labelled on each scatter points, please help thanks.

推荐答案

我会使用sprintf和一个简单的for循环来实现.

I would do it using sprintf and a simple for loop.

完整代码:

clear
clc


A =[
    2   1   5
    1   3   10
    1   -2  5
    0   5   25
    5   0   25
    1   1   2
    -1  -1  2]

[unqcol3,unqidx,allidx] = unique(A(:,3),'stable');
counts = sum(bsxfun(@eq,A(:,3),unqcol3.'),1);
out =[A(unqidx,:) counts(:)]
scatter(out(:,3), out(:,4));

    %// This step is not necessary but its easier to understand using it.
    a = out(:,1);
    b = out(:,2);
    x = out(:,3);
    y = out(:,4);

for k = 1:size(out,1)

    T{k} = sprintf('%i%i',a(k),b(k))

end
%// Determine x- and y-shift to place text relative to the scatter point
xshift = 0.03; yshift = 0.03;

%// Place the text
text(x+xshift, y+yshift, T);

输出:

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