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我有两个向量 c 和 d，我需要在 matlab 的同一个图中并排绘制其直方图。当我做 hist(c) 时；坚持，稍等; hist(d) 比例发生变化，我看不到 c 向量的直方图。我哪里错了？任何帮助将不胜感激。

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4 回答 4

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If you want the two to be in the same figure, you could try adjusting the X and Y limits to suit your needs (try help xlim and help ylim). However plotting them in the same figure might not always suit your needs, as a particular plot has to of course maintain a certain limit for X and Y.

If displaying them side by side in different figures would suffice however, you could consider using subplot():

>> A=[1 1 1 2 2];
>> B=[1 2 2 2 2];
>> figure(1);
>> hold on;
>> subplot(1,2,1);
>> hist(A);
>> subplot(1,2,2);
>> hist(B);

Resultant figure:

Notice how the different axis limits are maintained.

于 2013-03-25T13:50:36.100 回答
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您可以使用axis([xmin xmax ymin ymax])来控制 x 和 y 轴并选择将显示两个直方图的范围。根据您希望绘图的外观，您可能还想尝试使用nelements = hist(___)来获取每个 bin 中的元素数量，然后绘制它们bar(x,nelements)以控制每个条的位置。

于 2013-03-25T13:50:09.747 回答
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我经常使用 MATLAB 直方图，并编写了这个小的 matlab 脚本来在一个图中绘制两个直方图（第一个是红色的，第二个是蓝色的）。该脚本非常简单，但重要的是直方图应该具有可比性（即等间距的频率区间）。

function myhist(varargin)
% myhist function to plot the histograms of x1 and x2 in a single figure. 
% This function uses the same xvalue range and same bins to plot the
% histograms, which makes comparison possible. 
if nargin<2
    x1 = cell2mat(varargin(1));
    x2 = x1;
    res = 100;
elseif nargin==2
    x1 = cell2mat(varargin(1));
    if length(cell2mat(varargin(2)))==1
        res = cell2mat(varargin(2));
        x2 = x1;
    else
        x2 = cell2mat(varargin(2));
        res = 100;
    end
elseif nargin>2
    x1 = cell2mat(varargin(1));
    x2 = cell2mat(varargin(2));
    res = cell2mat(varargin(3));
end

if numel(x1)~=length(x1) || numel(x2)~=length(x2)
    error('Inputs must be vectors.')
    return
end

xrangel = max(min(x1),min(x2));
xrangeh = min(max(x1),max(x2));

x1_tmp = x1(x1>=xrangel & x1<=xrangeh);
x2_tmp = x2(x2>=xrangel & x2<=xrangeh);

xbins = xrangel:(xrangeh - xrangel)/res:xrangeh;

hist(x1_tmp,xbins)
hold on 
h = findobj(gca,'Type','patch');
set(h,'FaceColor','r','EdgeColor','w');
hist(x2_tmp,xbins)
于 2014-01-22T20:35:19.173 回答
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hist假设您希望默认将范围划分为 10 个大小相等的 bin。如果您想对两个直方图使用相同的 bin，首先找到您的值的范围并制作一组 bin 中心（例如binCenters = linspace(min(x), max(x), 15)'), then callhist(x, binCenters)`。

于 2013-03-25T14:47:19.683 回答