MATLAB中的饼图

饼图是分为多个部分的圆形图，每个部分代表整体的比例部分。在MATLAB中，我们有一个名为pie()的函数，该函数使我们能够绘制条形图。

句法：

pie(X)

pie(X) draws a pie chart using the data in X. Each slice of the pie chart represents an element in X.

• Where the sum(X) ≤ 1, then the areas of the pie slices directly specify the values in X pie draws only a partial pie if sum(X) < 1.
• Where the sum(X) > 1, then the area of each slice of the pie is determined by pie normalizes the values by X/sum(X)
• Here let X be a categorical data type, the slices correspond to categories. The number of elements in the category divided by the number of elements in X becomes The area of each slice.

现在让我们来看一些例子。

示例1：一个简单的饼图：

MATLAB

% data 
b= [20 30 40 30]
  
% pie function to draw pie chart
pie(b)

输出 ：

图1：饼图

示例2：具有偏移量的饼图：

的MATLAB

% data
b= [20 30 40 30]
% offset first and third by using 1 at explode 
explode = [1 0 1 0]
  
% pie function to draw pie chart with
% explode 1st and 3rd position data
pie(b,explode)

输出 ：

无花果2：带有偏移量的饼图

示例3：带有标签的饼图：

的MATLAB

% data
b= [20 30 40 30]
  
% labelling on Pie chart
labels={'a','b','c','d'}
  
% pie function to draw pie chart with labels
pie(b,labels)

输出 ：

图3：带有标签的饼图

示例4：部分饼图：

的MATLAB

% create vector whose sum is less than 1
b= [0.2 0.4 0.1]
  
% pie function to draw pie chart
pie(b)

输出 ：

图4：局部饼图

示例5：比较2个饼图：

的MATLAB

% data
b= [20 30 40 30]
a= [10 40 20 20]
  
% labelling on pie chart
labels={'a','b','c','d'}
  
% to add more than 1 plot in same figure
t = tiledlayout(1,2,'TileSpacing','compact');
  
% create pie charts
ax1 = nexttile;
pie(ax1,a)
title('Pie chart 1')
ax2 = nexttile;
pie(ax2,b)
title('Pie chart 2')
  
% create legend and put labels as arguments
lgd = legend(labels);
% position of legend there are 4 positions
%'north','south','east','west'
lgd.Layout.Tile = 'north';

输出 ：

图5：两个饼图的比较