Pie Chart in MATLAB
A Pie chart is a circular graph that is divided into sections and each section represents the proportionate part of the whole. In MATLAB we have a function named pie() which allows us to plot a bar graph.
Syntax:
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.
Now let’s move to some examples.
Example 1: A simple pie chart:
MATLAB
% data b= [20 30 40 30] % pie function to draw pie chart pie(b) |
Output :
Example 2: Pie chart with offset:
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) |
Output :
Example 3: Pie chart with labels:
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) |
Output :
Example 4: Partial Pie chart:
MATLAB
% create vector whose sum is less than 1 b= [0.2 0.4 0.1] % pie function to draw pie chart pie(b) |
Output :
Example 5: Compare 2 pie charts:
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' ; |
Output :