I need to add a hash (#) at the first position of a text file which is created by writetable. Rename of VariableNames does not work.

Question

BA 2017-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/335074-i-need-to-add-a-hash-at-the-first-position-of-a-text-file-which-is-created-by-writetable-rename

回答： BA 2017-4-26

I created a table with two columns and derived a tab-delimited txt-file. I Need to add a hash (#) at the very first Position of the txt-file. Thought about renaming the table.properties but doesn´t with #. Any tips?

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Answer 1

BA 2017-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/335074-i-need-to-add-a-hash-at-the-first-position-of-a-text-file-which-is-created-by-writetable-rename#answer_264604

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Solved on my own.

Create temporay text files containing the hash (#)
Merge temporay file and data file
Delete temporary file.

hash='#';
hashtxt=fopen('Hash.txt', 'w+');
fprintf(hashtxt, hash);
fclose(hashtxt);
system('copy/b Hash.txt+datafile.txt finalfile.txt');
delete Hash.txt;
delete datafile.txt;

Link to copy/b

"If it looks stupid but it works it ain´t stupid"

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Answer 2

Fei Deng 2017-4-17

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https://ww2.mathworks.cn/matlabcentral/answers/335074-i-need-to-add-a-hash-at-the-first-position-of-a-text-file-which-is-created-by-writetable-rename#answer_263323

There is a similar question about adding lines to top of text files, take a look of the posted answers there. https://www.mathworks.com/matlabcentral/newsreader/view_thread/243389

"You can't put it before the original first character of the file, as that could result in overwriting the tail part of another file. You can't create new locations on the disk (at least not without deforming the disk and transforming a lot of energy into matter to create the new disk material.)"