How to find a particular string in a stuct which has multiple fields?

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Kish1794 2018-8-31

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评论： Kish1794 2018-8-31

struct.png

I want to search and get the index of the string 'mnop' in the stuct MyStruct which has two fields abc and def. Please refer to the attachment to know how the struct looks. Currently string 'mnop' exists in second row of the field MyStruct.abc.I tried using strfind, strcmp and ismember. I know i'm missing a trick somewhere. Any help would be appreciated. Thanks.

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madhan ravi 2018-8-31

I mean the strict file so that it can be tested?

Kish1794 2018-8-31

MyStruct.mat

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Answer 1

Stephen23 2018-8-31

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https://ww2.mathworks.cn/matlabcentral/answers/416952-how-to-find-a-particular-string-in-a-stuct-which-has-multiple-fields#answer_334836

编辑：Stephen23 2018-8-31

在 MATLAB Online 中打开

MyStruct.mat

Why not something simple like this?:

>> S = load('MyStruct.mat');
>> MyS = S.MyStruct;
>> strcmp({MyS.abc},'mnop')
ans =
  0  1  0  0
>> strcmp({MyS.def},'mnop')
ans =
  0  0  0  0

This clearly identifies that the char vector 'mnop' exists in the second cell of the field abc. You can easily put this code into a loop, and loop over all of the fieldnames:

C = fieldnames(MyS);
for k = 1:numel(C)
    strcmp({MyS.(C{k})},'mnop')
end

and within the loop use whatever logic that you require.

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Kish1794 2018-8-31

thank you. It is simpler.

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Answer 2

Robert U 2018-8-31

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编辑：Robert U 2018-8-31

在 MATLAB Online 中打开

Hi Kish1794,

you can write a function that utilizes strfind on the structure array:

main.m

%%Create TestData
abc = {'jkl','mnop','zxcv','hgfsf'};
def = {'def','tre','asd','qwerty'};
for ik = 1:numel(abc)
    sIn(ik).abc = abc{ik};
    sIn(ik).def = def{ik};
end
%%Call Function
[nField,nStruct] = getFieldValue(sIn,'mnop');
%%Check result
cFields = fieldnames(sIn);
Output = sIn(nStruct{1}).(cFields{nField{1}});

getFieldValue.m

    function [ nField, nStruct ] = getFieldValue( sIn, strFind )
      cFieldName = fieldnames(sIn);
      nField = {};
      nStruct = {};
      for ik = 1:numel(cFieldName)
          testVec = ~cellfun(@isempty,strfind({sIn.(cFieldName{ik})},strFind));
          if any(testVec)
              nField{end+1} = ik;
              nStruct{end+1} = find(testVec);
          end
      end
end