how to escape,reading line that starts with special character in a text file.

Question

Aditya 2014-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/113068-how-to-escape-reading-line-that-starts-with-special-character-in-a-text-file

回答： Walter Roberson 2014-1-21

$hi jhon

$hey

$hello

hello

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Answer 1

kjetil87 2014-1-21

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编辑：kjetil87 2014-1-21

在 MATLAB Online 中打开

fid=fopen(filename);
if(fid<0);error('unable to open file');end
y=cell(500,1);%allocate some space, if you allocate less then the end
              %result it will take more time to read the file.
cntr = 1;
while (true)
    line = fgetl(fid);
    if(line==-1);break; end; %-1 indicates end of file...
    if(line(1)=='$')
        continue;
    end
    y{cntr} = line;
    cntr = cntr +1;
end
y=y(1:cntr-1);
fclose(fid);

Something like this maybe? I guess you could also read the entire file and then toss lines that starts with '$' , which in effect is what i am doing here aswell. But meh...

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Answer 2

Walter Roberson 2014-1-21

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textscan() has CommentStyle that allows you to set a string that indicates that everything after the string is a comment. But that would affect more than just the first column.