Matlab finds the position of a row or column in the matrix

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       A=[2 3 4];
       
       
B=[1 2 3;
       
       
   2 3 4;
       
       
   3 4 5];
       
       
[~,ind]=ismember(A,B,'rows')
       
       
[~,ind]=ismember(A,B','rows')
      
      
      
      

       
       
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function   ismember
Format   k = ismember(a,S)      % When a The element in belongs to S when ,k take 1, otherwise ,k take 0.
k = ismember(A,S,'rows')  %A、S Have the same columns , The return line is the same k take 1, Not the same 0 The column vector .