Write Data to Text Files in MATLAB
Writing data to a text file means creating a file with data that will be saved on a computer’s secondary memory such as a hard disk, CD-ROM, network drive, etc. fprintf() function is used to write data to a text file in MATLAB. It writes formatted text to a file exactly as specified. The different escape sequences used with fprintf() function are:
\n : create a new line
\t : horizontal tab space
\v : Vertical tab space
\r : carriage return
\\ : single backslash
\b : backspace
%% : percent character
The format of the output is specified by formatting operators. The formatSpec is used to format ordinary text and special characters. A formatting operator starts with a percent sign% and ends with a conversion sign. The different format specifiers used with fprintf() function are:
%d or %i: Display the value as an integer
%e : Display the value in exponential format
%f : Display floating point number
%g : Display the value with no trailing zeros
%s : Display string array (Unicode characters)
%c : Display single character(Unicode character)
Now let’s start writing data to a text file. Before writing to a file, we need to open the text file using fopen() function. To open a file, the syntax is:
f=fopen(File_name, Access_mode)
Here,
fopen() function accepts two arguments:
- name of the file or File_identifier.
- type of access mode in which the file is to be open. We need to write data, so the access mode can be ‘w’, ‘w+’, ‘a’, ‘a+’.
Let’s see different ways to write data to text files are:
Example 1:
Matlab
a= [1,2,3,4; 5,6,7,8; 9,10,11,12;13,14,15,16];
file=fopen( 'GfG.txt' , 'w' );
fprintf(file, '%3d %3d %3d %3d \n' ,a);
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Output:
Note: If the file name is not specified then the result will be displayed on the screen.
Example 2:
Matlab
a = [1.500,2.500, 3.500,4.500];
formatSpec = 'a is %4.2f \n' ;
file=fopen( 'Gfg.txt' , 'w' );
fprintf(file,formatSpec,a);
fclose(file);
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Output:
Example 3:
Matlab
x = 1:10;
A = x.^2;
fileID = fopen( 'power.txt' , 'w' );
fprintf(fileID, '%4s %4s\n' , 'x' , 'power^2' );
fprintf(fileID, '%4.2f %5.2f\n' ,A);
fclose(fileID);
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Output:
Example 4:
Matlab
sitename = 'Web Site for geeks' ;
f=fopen( 'gfg.txt' , 'w' );
fprintf(f, '<a href = "%s">%s</a>\n' ,url,sitename);
fclose(f);
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Output:
Last Updated :
04 Jul, 2022
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