How to read data from a file into cell array keeping indents undisturbed

Question

Shankar Santhosh 2020-9-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/600835-how-to-read-data-from-a-file-into-cell-array-keeping-indents-undisturbed

评论： Shankar Santhosh 2020-9-28

I am trying to read a data from a file, modify it and write to a same file which I did using,

fid  = fopen('file.ext','r');
fclose(fid);
lines = textscan(fid,'%s','Delimiter','\n');
...
fid  = fopen('file.ext','w');
for row = 1:length(lines{1})
    fprintf(fid,'%s\n',lines{1}{row});
end
fclose(fid);

But I could not reproduce the indents which were in the original file. So any suggestions to achieve this and make the above process easier?

Note: the file extension is not .txt but similar to text format. The data which I try to read has html tag elements and attributes.

I would also like to know whether there is any way to directly modify a file without reading it?

Thanks in advance!

2 个评论
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Jan 2020-9-27

If you close the file by fclose before running textscan, the code should fail with an error message.

Shankar Santhosh 2020-9-28

You are right! I just misplaced the lines in this query. But I had it right in my code.

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Answer 1

Jan 2020-9-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/600835-how-to-read-data-from-a-file-into-cell-array-keeping-indents-undisturbed#answer_501376

编辑：Jan 2020-9-27

在 MATLAB Online 中打开

% Import file:
Str = fileread('file.ext');
% Remove trailing line break to avoid appending an additional empty line:
if ~isempty(Str) && Str(numel(Str)) == char(10)
    Str(numel(Str)) = [];
end
% Split lines:
% lines = strsplit(Str, char(10));
% Faster but uglier (this is what happens inside STRSPLIT):
lines = regexp(Str, ['(?:', char(10), ')+'], 'split');
...
% Write output:
fid = fopen('file.ext', 'w');
fprintf(fid, '%s\n', lines{:});
fclose(fid);