# Which Graph Type Represents Plotted Data in the Form of Percentage in Matlab?

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Larry Thompson

Which Graph Type Represents Plotted Data in the Form of Percentage in Matlab?

When it comes to visualizing data in Matlab, there are various graph types that can be used depending on the nature of the data and the message you want to convey. If you have data that represents percentages, it is important to choose a graph type that accurately represents this information. In this tutorial, we will explore different graph types in Matlab that are suitable for plotting percentage data.

## 1. Pie Chart

A pie chart is a circular graph divided into sectors, where each sector represents a different category or variable. The size of each sector is proportional to its corresponding percentage value. Pie charts are ideal for displaying relative proportions or percentages of a whole.

To create a pie chart in Matlab, you can use the pie function. Here’s an example:

``````
data = [30 20 50]; % example percentage values
labels = {'Category A', 'Category B', 'Category C'}; % example labels

figure;
pie(data, labels);
title('Percentage Distribution');
```
```

This code will generate a pie chart with three sectors representing the percentages 30%, 20%, and 50% for Category A, Category B, and Category C respectively.

## 2. Bar Chart

A bar chart is another effective way to represent percentage data. Bar charts use rectangular bars where the length of each bar is proportional to its corresponding value or percentage. They are particularly useful when comparing multiple categories or variables.

To create a bar chart in Matlab, you can use the bar function. Here’s an example:

``````
data = [30 20 50]; % example percentage values
categories = {'Category A', 'Category B', 'Category C'}; % example categories

figure;
bar(data);
set(gca, 'XTickLabel', categories);
xlabel('Categories');
ylabel('Percentage');
title('Percentage Distribution');
```
```

This code will generate a bar chart with three bars representing the percentages 30%, 20%, and 50% for Category A, Category B, and Category C respectively.

## 3. Stacked Bar Chart

A stacked bar chart is an extension of the bar chart where multiple bars are stacked on top of each other to represent the cumulative total of different variables or categories. Each segment of a stacked bar represents the percentage contribution of a specific category to the total.

To create a stacked bar chart in Matlab, you can use the bar function with additional settings. Here’s an example:

``````
data = [30 20 50; 10 5 15]; % example percentage values for two groups
categories = {'Group A', 'Group B'}; % example group labels

figure;
bar(data, 'stacked');
set(gca, 'XTickLabel', categories);
xlabel('Groups');
ylabel('Percentage');
title('Percentage Distribution by Groups');
legend({'Category A', 'Category B', 'Category C'});
```
```

This code will generate a stacked bar chart with two groups (Group A and Group B) and three categories (Category A, Category B, and Category C). Each group will have stacked bars representing the percentages for each category.

## 4. Area Chart

An area chart is similar to a line chart, but the area between the line and the x-axis is filled with color. Area charts are useful for showing the cumulative percentage or total distribution of different variables over time or categories.

To create an area chart in Matlab, you can use the area function. Here’s an example:

``````
x = 1:10; % example x-axis values
data = [30 20 50]; % example percentage values

figure;
area(x, data);
xlabel('Time');
ylabel('Percentage');
title('Percentage Distribution over Time');
```
```

This code will generate an area chart with the x-axis representing time and the y-axis representing percentages. The areas below the line will be filled to represent the percentage distribution over time.

### In Conclusion

When working with percentage data in Matlab, it is important to choose a graph type that effectively communicates your message. Pie charts, bar charts, stacked bar charts, and area charts are all powerful visualization tools that can accurately represent percentage data. Experiment with these graph types to find the most suitable one for your specific data set and analytical needs.