I want to write data at the end of every nth line of a text file

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Radu Mihail 2024-7-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2139116-i-want-to-write-data-at-the-end-of-every-nth-line-of-a-text-file

评论： Voss 2024-7-21

采纳的回答： Voss

I have a long text file which contains several thousands of the following type of data

a0 =

333222

323312

310132

a1=

33222

323312

310132

a2=

133222

323312

310132

a3=

233222

323312

310132

a4=

303222

323312

310132

a5=

313222

323312

310132

a6=

323222

323312

310132

a2776=...

And I want to add at the end of evry 4th line a letter c and save back that modified file in txt format. After modification it should look like that

a0 =

333222

323312

310132c

a1=

33222

323312

310132c

a2=

133222

323312

310132c

a3=

233222

323312

310132c

a4=

303222

323312

310132c

a5=

313222

323312

310132c

a6=

323222

323312

310132c

a2776=...

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采纳的回答

Voss 2024-7-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2139116-i-want-to-write-data-at-the-end-of-every-nth-line-of-a-text-file#answer_1488531

str = readlines(filename);
str(4:4:end) = str(4:4:end) + "c";
writelines(str,filename)

where "filename" is the absolute or relative path to your text file, e.g., filename = 'C:\work\files\my_file.txt'.

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Radu Mihail 2024-7-21

Thank you Voss!

Voss 2024-7-21

You're welcome!

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