Displaying All the Related Items from an Input File

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Glorit P. 2020-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/537867-displaying-all-the-related-items-from-an-input-file

评论： Ameer Hamza 2020-6-1

采纳的回答： Ameer Hamza

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I am working on a program where I have to read a text file data.txt which has content like this:

Mango Guava

Banana

Pears Strawberry

Guava Watermelon

Coconut Guava

Here, Mango is related to Guava, Banana is not related to anyone, Pears is related to strawberry, Guava is related to Watermelon, and Coconut is related is Guava.

Now, the aim of the program is to check the second string of each row (if present) (i.e., Guava) with the first string in the first column (only) and if present display its relation altogether. The output of the program should be:

Mango Guava Watermelon

Banana

Pears Strawberry

Coconut Guava Watermelon

Here is what i have tried. I have read the file data and split it into 2 cell array and stored it in B and C. How should i go further to check the relations and dispay the output. Your help would be appreciated.

fid=fopen('data.txt');
tline = fgetl(fid);
tlines = cell(0,1);
while ischar(tline)
    tlines{end+1,1} = tline;
    tline = fgetl(fid);
end
D = regexp(tlines, '\s+', 'split');
A = vertcat(D{:});
for i= 1:length(A)
    t = strsplit(A{i}) ;
    b{i} = t{1} ;
end
B=b'; 
for j= 1:length(A)
    s = strsplit(A{j,2}) ;
    c{j} = s{1} ;
end
C=c';

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采纳的回答

Ameer Hamza 2020-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/537867-displaying-all-the-related-items-from-an-input-file#answer_442615

编辑：Ameer Hamza 2020-5-29

在 MATLAB Online 中打开

Try this

str = fileread('test.txt');
str_words = cellfun(@(x) {strsplit(x, ' ')}, strsplit(str, '\n'));
str_words = [vertcat(str_words{:}) repmat({''}, size(str_words, 2), 1)];
[tf, idx] = ismember(str_words(:,2), str_words(:,1));
str_words(tf, 3) = str_words(idx(tf), 2);
str_words = str_words.';
sprintf('%s %s %s\n', str_words{:})

Result

ans =
    'Mango Guava Watermelon
     Banana  
     Pears Strawberry 
     Guava Watermelon 
     Coconut Guava Watermelon
     '

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Glorit P. 2020-6-1

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Hi Ameer,

For some strange reason, i do not know why it is giving me different output for the same code.

I made slight modification to your code and it is giving me the same output as required now.

Thank you very much for all your help and time. Much appreciated.

Here is a code that worked for me.

fid=fopen('data1.txt');
tline = fgetl(fid);
str = cell(0,1);
while ischar(tline)
    str{end+1,1} = tline;
    tline = fgetl(fid);
end
D = regexp(str, '\s+', 'split');
A = vertcat(D{:});
while true
    [tf, idx] = ismember(A(:,end), A(:,end-1));
    A(tf, end+1) = A(idx(tf), end);
    A(~tf, end) = deal({''});
    if all(cellfun(@isempty, A(:,end)))
        break;
    end
end
A(:,end) = [];
A = A.';
fprintf([repmat('%s ', 1, size(A,1)) '\n'], A{:})