I have a matrix that contains strings and i have to find words in it.

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Ziyad Azouny 2020-2-19

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评论： Ziyad Azouny 2020-3-6

I have to create a program that gives you the position of the first letter of the word you input and if it's from left to right or right to left.

for example if you input the word 'er' it should tell you that:

The word was found from left to right at the position (1,1)

Please help

['e' 'r' 'd' 'u' 'o' 'p' 'i' 'e' 'c' 'e';...
            't' 'p' 'r' 'o' 'm' 'e' 't' 'a' 'l' 'l';...
            'i' 's' 'd' 'p' 's' 't' 'u' 'b' 'a' 'a';...
            'g' 'e' 'p' 'o' 'm' 's' 'i' 'c' 'm' 'v';...
            's' 't' 'e' 'i' 'u' 'r' 'a' 't' 'e' 'a';...
            'o' 't' 'n' 'n' 'c' 'b' 'c' 'b' 'r' 'g';...
            'u' 'e' 'f' 'c' 't' 'e' 'l' 'u' 'l' 'e';...
            'v' 'l' 'i' 'o' 'r' 'b' 'r' 'o' 'i' 'e';...
            'e' 'l' 'e' 'n' 'u' 'u' 'i' 'r' 'n' 't';...
            'r' 'i' 'v' 'i' 'e' 'r' 'e' 'j' 'g' 'a';...
            'a' 'a' 'r' 'n' 'e' 'l' 'r' 'r' 'o' 'c';...
            'i' 'p' 'e' 'c' 'a' 'r' 'a' 't' 't' 'u';...
            'n' 't' 'e' 'g' 'a' 'i' 'l' 'l' 'a' 'd';...
            'f' 'i' 'l' 'o' 'n' 'o' 'l' 'a' 't' 'e']

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Mil Shastri 2020-2-19

Hi Ziyad, could you rephrase your question. It's not very clear.

Also, consider checking out a previous discussion: https://www.mathworks.com/matlabcentral/answers/231706-finding-position-of-a-string-in-a-cell-array

Stephen23 2020-3-3

编辑：Stephen23 2020-3-3

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The character array shown in the question can be written more simply as:

   ['erduopiece';...
    'tprometall';...
    'isdpstubaa';...
    'gepomsicmv';...
    'steiuratea';...
    'otnncbcbrg';...
    'uefctelule';...
    'vliorbroie';...
    'elenuuirnt';...
    'rivierejga';...
    'aarnelrroc';...
    'ipecarattu';...
    'ntegaillad';...
    'filonolate']

or:

['erduopiece';'tprometall';'isdpstubaa';'gepomsicmv';'steiuratea';'otnncbcbrg';'uefctelule';'vliorbroie';'elenuuirnt';'rivierejga';'aarnelrroc';'ipecarattu';'ntegaillad';'filonolate']

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Answer 1

Jalaj Gambhir 2020-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/506418-i-have-a-matrix-that-contains-strings-and-i-have-to-find-words-in-it#answer_418244

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Hi,

You can use strfind function to determine the presence of elements in you char array.

matrix = ['a','b','d','f';
          'c','t','a','g';
          'f','a','n','p';
           'd','b','a','b'];
word = 'ab';
for i=1:length(matrix)
    str = matrix(i,:);
    idxL2R = strfind(str,word);
    idxR2L = strfind(str,flip(word));
    result = ['for string = ',str,' indexL2R while searching for word = ',word,
             ' is = ',int2str(idxL2R), ' indexR2L is = ', int2str(idxR2L)];
    disp(result);
end

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Jalaj Gambhir 2020-3-3

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Result:

for string = abdf indexL2R while searching for word = ab is = 1 indexR2L is = 
for string = ctag indexL2R while searching for word = ab is =  indexR2L is = 
for string = fanp indexL2R while searching for word = ab is =  indexR2L is = 
for string = dbab indexL2R while searching for word = ab is = 3 indexR2L is = 2

Ziyad Azouny 2020-3-6

Thank you very much for the answer :)

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Answer 2

Stephen23 2020-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/506418-i-have-a-matrix-that-contains-strings-and-i-have-to-find-words-in-it#answer_418263

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>> mat = ['erduopiece';'tprometall';'isdpstubaa';'gepomsicmv';'steiuratea';'otnncbcbrg';'uefctelule';'vliorbroie';'elenuuirnt';'rivierejga';'aarnelrroc';'ipecarattu';'ntegaillad';'filonolate'];
>> baz = @(r,c)[r*ones(numel(c),1),c(:)];
>> vec = num2cell(1:size(mat,1));
>> fun = @(s)cell2mat(cellfun(baz,vec(:),strfind(num2cell(mat,2),s),'uni',0)).';
>> str = 'er';
>> fprintf('The word was found from left to right at the position (%u,%u)\n',fun(str))
The word was found from left to right at the position (1,1)
The word was found from left to right at the position (10,5)
>> fprintf('The word was found from right to left at the position (%u,%u)\n',fun(fliplr(str)))
The word was found from right to left at the position (10,6)