I want t write a number to a file

Question

Jonas Müller 2022-4-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1686984-i-want-t-write-a-number-to-a-file

评论： Voss 2022-4-2

采纳的回答： Voss

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

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Answer 1

Voss 2022-4-2

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1686984-i-want-t-write-a-number-to-a-file#answer_932934

在 MATLAB Online 中打开

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.

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Jonas Müller 2022-4-2

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

Voss 2022-4-2

在 MATLAB Online 中打开

    %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