Read a Special Text File
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I was wondering if there is a quick way to read the following text file sample where the first data line starts with a bracket. I would like to avoid the hassle of manually removing the bracket from every file I obtain. I use the following command for now after I remove the bracket.
Thanks.
data = textscan(Fopen, '%d %f %d %d %d;', 'HeaderLines',2)
file.txt
1 个评论
Stephen23
2022-4-23
A simple and very efficient approach would be to simply define the square bracket as whitespace, which you can do using TEXTSCAN's WHITESPACE option. Another good approach would be to use a fixed-width import via READTABLE.
Using STR2NUM is not very efficient.
采纳的回答
Here are two much more efficient approaches.
The first is exactly like you are doing now, just adding the WHITESPACE option to efficiently ignore the square bracket:
fnm = 'textfile.txt';
fmt = '%d%f%d%d%d;';
opt = {'HeaderLines',2, 'Whitespace',' \t['};
fid = fopen(fnm,'rt');
data = textscan(fid, fmt, opt{:})
fclose(fid);
The second is to import the file as table, which has headers and may be more convenient to access:
opt = detectImportOptions(fnm, 'FileType','fixedwidth', ...
'VariableWidths',[6,9,16,16,16], 'VariableNamesLine',1, ...
'VariableNamingRule','preserve', 'Range',3, 'Whitespace',' [', ...
'ExtraColumnsRule','ignore');
tbl = readtable(fnm,opt)
更多回答（2 个）
% read file into character vector data
data = fileread('textfile.txt');
% remove the first two lines
idx = find(data == newline(),2);
data(1:idx(end)) = [];
% convert to numeric
M = str2num(data);
% show some results
format long
disp(M(1:10,:));
disp(M(end-9:end,:));
David Hill
2022-4-22
r=readmatrix('file.txt');%see if this will work
3 个评论
AEW
2022-4-22
Thank you for the answer.
Unfortunately, it does not work. I get the following:
David Hill
2022-4-22
If you attach the text file, I would be able to help better.
AEW
2022-4-22
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