How to read data from a file into cell array keeping indents undisturbed
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Shankar Santhosh
il 27 Set 2020
Commentato: Shankar Santhosh
il 28 Set 2020
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 Commenti
Jan
il 27 Set 2020
If you close the file by fclose before running textscan, the code should fail with an error message.
Risposta accettata
Jan
il 27 Set 2020
Modificato: Jan
il 27 Set 2020
% 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);
Più risposte (1)
Rik
il 27 Set 2020
It will read a file to a cell array, one cell element per line, and it will preserve all leading and trailing spaces.
One of the advantages of a cell array is that you can trivially write out the modified file: fprintf(fid,'%s\n',txt{:}).
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