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fprintf


Writes data to a file.


Syntax


fprintf(format, v1, ... , vn)
fprintf(fid, format, v1, ... , vn)
R = fprintf(fid, format, v1, ... , vn)

Input argument


fid

a file descriptor

format

a string describing the format to used_function.

v1, ... , vn

data to convert and print according to the previous format parameter.

Output argument


R

an integer value: number of bytes that fprintf write.

Description


Write data in text form to the file specified by the file descriptor fid.

characters encoding uses fopen parameter.

If fid equals 1 redirection in stdout.

If fid equals 2 redirection in stderr.

The format follows C fprintf syntax.

Value type format comment
Integer %i base 10
Integer signed %d base 10
Integer unsigned %u base 10
Integer %o Octal (base 8)
Integer %x Hexadecimal (lowercase)
Integer %X Hexadecimal (uppercase)
Floating-point number %f Fixed-point notation
Floating-point number %e Exponential notation (lowercase)
Floating-point number %E Exponential notation (uppercase)
Floating-point number %g Exponential notation (compact format, lowercase)
Floating-point number %G Exponential notation (compact format, uppercase)
Character %c Single character
String %s Character vector.

Examples


fileID = fopen([tempdir(), 'fprintf.txt'],'wt');
fprintf(fileID, 'an example of %s.', 'text');
fclose(fileID);

R = fileread([tempdir(), 'fprintf.txt'])

fprintf(1, 'an value %g.', pi);
fprintf(2, "an value %g.", pi);

How to use backspace

reverseStr = '';
for idx = 1 : 100
 percentDone = idx;
 msg = sprintf('Percent done: %3.1f', percentDone);
 fprintf([reverseStr, msg]);
 reverseStr = repmat(sprintf('\b'), 1, length(msg));
end

See also


fopen, fclose, fread.

History


Version Description
1.0.0 initial version

Author


Allan CORNET

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