How to open file, clear content, rewrite conent and close.

Question

Wesser 2022-8-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1791845-how-to-open-file-clear-content-rewrite-conent-and-close

评论： Wesser 2022-9-1

Hi,

I'm trying to open a .dir file (same as a .txt file) clear the content, rewrite the content and then close. The content is different paths to files, which are a combination of numbers and letters. As currently scripted, the .dir file gets rewritten with a series of numbers ...so there is something wrong with the notation, but I'm not sure what. Also, this script creates another level_01 file, but I don't need it to...

for i=1:num_sim
    % Rewrite level_01.dir with new file path for each MC iteration
    DIR_working = sprintf('%s%d','C:\Users\jessi\Desktop\HydrusMC\Simulations\MC_',i);
    
    % Print the file path of HYDRUS-1D input files in LEVEL_01.dir
    DIR=fopen('C:\Users\jessi\Desktop\HydrusMC\LEVEL_01.dir','wt+');
    fprintf(DIR,'%f',DIR_working);
    fclose(DIR);
end

thanks for any suggestions!!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2022-8-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1791845-how-to-open-file-clear-content-rewrite-conent-and-close#answer_1038910

在 MATLAB Online 中打开

DIR=fopen('C:\Users\jessi\Desktop\HydrusMC\LEVEL_01.dir','wt+');

That looks for a file named C:\Users\jessi\Desktop\HydrusMC\LEVEL_01.dir . If it does not find it, it creates the file and opens it for reading and writing. If it does find the file, it opens the file for reading and writing and discards all existing content in the file.

    DIR_working = sprintf('%s%d','C:\Users\jessi\Desktop\HydrusMC\Simulations\MC_',i);
    

That is a character vector

fprintf(DIR,'%f',DIR_working);

%f format is "floating point", but what you are passing in is a character vector. The individual characters in the vector will be treated as numbers (using their Unicode code point), and the resulting integers will be output as floating point numbers. You did not specify any space or commas or other delimiters, so the numbers will all run together in the file.

If you want to output a character string use '%s\n' format.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Wesser 2022-9-1

Thanks!

请先登录，再进行评论。

Answer 2

dpb 2022-8-31

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1791845-how-to-open-file-clear-content-rewrite-conent-and-close#answer_1038915

在 MATLAB Online 中打开

DIR_working="C:\Users\jessi\Desktop\HydrusMC\Simulations\MC_"+[1:num_sim].';
writematrix(DIR_working,'C:\Users\jessi\Desktop\HydrusMC\LEVEL_01.dir','FileType','text')