I want t write a number to a file

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Jonas Müller
Jonas Müller on 2 Apr 2022
Commented: Voss on 2 Apr 2022
I want to do this:
fOutput = fopen('test.txt','wt');
fprintf(fOutput,'%5.2d',22.56);
fclose(fOutput);
but the txt file is empty after doing this

Accepted Answer

Voss
Voss on 2 Apr 2022
It seems to work ok here:
fOutput = fopen('test.txt','wt');
fprintf(fOutput,'%5.2d',22.56);
fclose(fOutput);
ls *.txt
test.txt
type test.txt
2.26e+01
It could be that too many files are open already, e.g., because of code that has previously been run.
You can do fclose all to close all open files and then try to write to test.txt again.
  2 Comments
Jonas Müller
Jonas Müller on 2 Apr 2022
Ok thanks. What means '%5.2d' ? With '%s' it works but i want a float number
Voss
Voss on 2 Apr 2022
%5.2d
% ^ beginning of formatted text signifier
% ^ 5 characters wide (total width)
% ^^ 2 characters after the decimal point (precision)
% ^ decimal number
%5.2f
% ^ floating-point number
fprintf(1,'%5.2d',22.56)
2.26e+01
fprintf(1,'%5.2f',22.56)
22.56

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