textscan output into one cell

Question

amen45 2015-12-17

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260784-textscan-output-into-one-cell

评论： amen45 2015-12-18

I'm reading in a text file that contains many sets of strings separated by line and then by tab. I need to use textscan or something similar because of variability in the txt files I'll be using. Currently, I'm using code like the below to separate each of the strings into their own cell array, and then haphazardly group them into one cell(my desired output). I'm wondering if there is a more efficient way to go about this, and if it's possible to do this without the second loop or even the second text scan. Thank you in advance for your help!

   for i=1:length(data)
    check=char(data{i});
    row= textscan(check, '%s', 'Delimiter', ' ');
    for j= 1:length(row{1})
        a{i,j}=row{1}{j}
    end
 end

Example text format:

disorganizedstring

disorganized string string

stringtype1 stringtype2 stringtype3 stringtype4

Current output:

 'stringtype1'    'stringtype2'    'stringtype3'    'stringtype4'
    'stringtype1'    'stringtype2'    'stringtype3'    'stringtype4'
    'stringtype1'    'stringtype2'    'stringtype3'    'stringtype4'
    'stringtype1'    'stringtype2'    'stringtype3'    'stringtype4'
    'stringtype1'    'stringtype2'    'stringtype3'    'stringtype4'

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2015-12-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260784-textscan-output-into-one-cell#answer_203641

在 MATLAB Online 中打开

filecontent = fileread('YourFile.txt');
content_by_line = regexp(filecontent, '\r?\n', 'split');
content_by_field = regexp( content_by_line(:), '\t', 'split');
max_fields = max( cellfun(@length, content_by_field) );
cellpad = repmat({{}}, 1, max_fields);
first_n_fields = @(C, n) C(1:n);
padded_content = cellfun(@(C) first_n_fields([C,cellpad], max_fields), content_by_field, 'Uniform', 0);
desired_output = vertcat(padded_content{:});

This reads the file and splits it into lines and then splits the lines into fields. Then it finds the line with the most fields, and constructs padding as long as that. It then goes through and pads each line and takes the first N outputs: in this way without having to test how many fields there were on the line, each line is padded out to the same length. Once you have the cell array of cell arrays that are all the same length, a simple change converts it to a 2D cell array.