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Import Data from CSV File into MATLAB Workspace
CSV or Comma Separated Values is a file format that can store numeric and text values. The most important characteristic of a CSV file is that it allows to exchange the data among a variety of sources.
MATLAB is a powerful tool that provides a large number of built-in functions to perform various operations. It provides the following two functions that enable the users to import data with numeric and text values from a CSV file into the MATLAB workspace.
readtable()
importdata()
In this tutorial, I will show you the process of importing data from a CSV file into the MATLAB workspace using these functions.
Import Data Using the Readtable() Function
In MATLAB, the "readtable" function is a built-in function in its function library. This function is used to import data with text and numeric values into the MATLAB workspace.
Syntax
data = readtable(file_path);
The step-by-step process of importing data with numeric values and text from a CSV file into MATLAB workspace is explained below.
Step (1) Read the CSV file and store in a variable.
Step (2) Specify the variable names.
Step (3) Call the "readtable" function to import data from CSV file.
Step (4) Display the imported data.
We can follow these simple four steps to import data from a CSV file into the MATLAB workspace.
Example
Let us take an example to understand the implementation of these steps in MATLAB programming.
% MATLAB code to create a sample CSV file
% Create a sample table with numeric and text data
course_data = table([101; 102; 103; 104; 105; 106; 107;], {'Math'; 'Physics'; 'Chemistry'; 'MATLAB'; 'Electronics'; 'C++'; 'Java';}, [1000; 1500; 1200; 1500; 450; 700; 600], 'VariableNames', {'CourseID', 'CourseName', 'Fee'});
% Specify the name for the CSV file
file_name = 'course_data.csv';
% Write the table to the CSV file
writetable(course_data, file_name);
% Display the confirmation message and table
disp('The CSV file has been created successfully.');
disp(course_data);
Output
It will create a CSV file with the following data
The CSV file has been created successfully.
CourseID CourseName FeeÂ
________Â _______________Â ____
101 {'Math' } 1000
102 {'Physics' } 1500
103 {'Chemistry' } 1200
104 {'MATLAB' } 1500
105 {'Electronics'} 450
106 {'C++' } 700
107 {'Java' } 600
Now, let us implement the code to import the numeric values and text data from this CSV file into the workspace.
Example
% Import data from CSV file into workspace using readtable function
% Specify the file path to the CSV file
file_path = '/MATLAB Drive/course_data.csv'; % Replace with your CSV file path
% Call the readtable function to import data from the CSV file
data = readtable(file_path);
% Display the imported data
disp('This CSV file contains the following data.');
disp(data);
Output
When you run this code, it will produce the following output
This CSV file contains the following data.
CourseID CourseName FeeÂ
________Â _______________Â ____
101 {'Math' } 1000
102 {'Physics' } 1500
103 {'Chemistry' } 1200
104 {'MATLAB' } 1500
105 {'Electronics'} 450
106 {'C++' } 700
107 {'Java' } 600
This example shows how we can use the "readtable" function to import data from a CSV file into MATLAB workspace.
Let us see another method of importing data with numeric values and text from a CSV file into MATLAB workspace.
Import Data Using the Importdata() Function
In MATLAB, the "importdata" function is another built-in function in MATLAB function library. This can be used to import numeric values and text data from a CSV file into the MATLAB workspace.
Syntax
data = importdata(file_path, delimiter);
The steps involved in importing the numeric values and text data from a CSV file into the workspace using the "importdata" function are explained below.
Step (1) Read the CSV file and store in a variable.
Step (2) Call the "importdata" function to access the data in the CSV file.
Step (3) Read and display the column heaters.
Step (4) Read and display the text data in the CSV file.
Step (5) Read and display the numeric data in the CSV file.
Example
Let us see an example to implement these steps in MATLAB programming.
% Import data from CSV file into workspace using importdata function
% Specify the file path to the CSV file
file_path = '/MATLAB Drive/course_data.csv'; % Replace with your CSV file path
% Call the importdata function to read the CSV file
data = importdata(file_path);
% Read and display the text data
text_data = data.textdata;
disp('Text Data:');
disp(text_data);
% Read and display the numeric data
numeric_data = data.data;
disp('Numeric Data:');
disp(numeric_data);
Output
When you run this code, it will produce the following output
Text Data:
{'CourseID'} {'CourseName' } {'Fee' } Numeric Data:
{'101' } {'Math' } {0Ã0 char} 1000
{'102' } {'Physics' } {0Ã0 char} 1500
{'103' } {'Chemistry' } {0Ã0 char} 1200
{'104' } {'MATLAB' } {0Ã0 char} 1500
{'105' } {'Electronics'} {0Ã0 char} 450
{'106' } {'C++' } {0Ã0 char} 700
{'107' } {'Java' } {0Ã0 char} 600
In this example, I demonstrated the use of the "importdata" function to import numeric values and text data from a CSV file into the MATLAB workspace.
Conclusion
In conclusion, importing data with numeric values and text from a CSV file into the workspace is one of the basic and crucial operation in MATLAB. CSV files are used to store data comma-separated values.
In this tutorial, I explained the step-by-step process of importing numeric and text data from a CSV file into workspace using two built-in functions in MATLAB. These functions are "readtable" and "importdata". You can try these MATLAB codes with different CSV files by replacing the file path.
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