issue regarding reading .txt file with comments
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Akshat Shrivastava
on 1 Aug 2018
Commented: Walter Roberson
on 3 Aug 2018
Hello, I am trying to load a 'txt' file and plot it. It has just 2 columns and multiple rows. I also have few rows which have comments which i can not remove. But when i load the file and plot it. it just plot the data till the row which has the 1st comment. After that it is not acknowledging or reflecting the data. What can be done for this? Please help me out. I am using 2018 version Thanks in advance.
3 Comments
Accepted Answer
Adam Danz
on 1 Aug 2018
Edited: Adam Danz
on 1 Aug 2018
If you are using textscan() to read in the data, you can use the 'CommentStyle' property which will ignore any text on a single line following the comment character ('#').
A simple example
fid = fopen('test1.txt');
C = textscan(fid, %f, 1, 'CommentStyle', '#');
fclose(fid);
1 Comment
Walter Roberson
on 1 Aug 2018
You would probably want
C = cell2mat( textscan(fid, '%f%f', 'CommentStyle', '#', 'CollectOutput', true) );
More Answers (1)
Stephen23
on 2 Aug 2018
Edited: Stephen23
on 3 Aug 2018
More robust:
opt = {'CommentStyle','#', 'CollectOutput',true};
[fid,msg] = fopen('yourfile.txt','rt');
assert(fid>=3,msg)
C = textscan(fid, '%f%f', opt{:});
fclose(fid);
M = C{1};
Or use dlmread.
6 Comments
Stephen23
on 3 Aug 2018
Edited: Stephen23
on 3 Aug 2018
Akshat Shrivastava: please upload your data file. I cannot load a screenshot as data.
Possibly you just need to add 'MultipleDelimsAsOne' to the options cell array, but without your actual data file this is impossible for me to test.
Or you might be able to trivially use dlmread. This would be easy to check if I had your data file.
Walter Roberson
on 3 Aug 2018
In particular we need to verify whether the file is tab delimited or simple space delimited or is fixed width fields.
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