putting space between string and double using fprintf

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sermet OGUTCU 2021-8-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/897862-putting-space-between-string-and-double-using-fprintf

编辑： Adam Danz 2021-8-13

fprintf(fid,'%*s %*s\n',10,'  G1',10,'   G2');
fprintf(fid,'%s  %.1f  %s   %.1f\n', 'Average_1:', data_1, 'Average_2:', data_2);

In the first code, 10 spaces were added before 'G1' and 'G2' string. In the second code, how I can add 10 spaces before "Average_1" and "Average_2"?

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Answer 1

Adam Danz 2021-8-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/897862-putting-space-between-string-and-double-using-fprintf#answer_766402

编辑：Adam Danz 2021-8-13

> In the first code, 10 spaces were added before 'G1'

That's incorrect. 8 spaces are added prior to 'G1'. From the documentation, the asterisk and number pair defines the minimum number of characters to print including the number of characters in the string. In this case, G1 contains 2 strings so there are 8 spaces added.

This solution uses an anonymous function addSpace(n,str) where n is a positive integer and str is a character row vector. Call the function within fprintf inputs to add n spaces prior to the string.

addSpace = @(n,str)[char(32*ones(1,n)),str]; 
fprintf('%s %.1f%s %.1f\n', ...
    addSpace(10,'Average_1:'), rand, ...
    addSpace(10,'Average_2:'), rand);
          Average_1: 0.4          Average_2: 0.5