I want t write a number to a file

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

Answer 1

[Voss]

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.

[Jonas Müller]

Ok thanks. What means '%5.2d' ? With '%s' it works but i want a float number

[Voss]

    %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

More information about formatted text: https://www.mathworks.com/help/matlab/matlab_prog/formatting-strings.html