Sort a matrix according to only one column [duplicate]












1
















This question already has an answer here:




  • Sorting entire matrix according to one column in matlab

    2 answers




I have this matrix A,



A= [10  -12  4  8;

    1  3  11 -2;

    1  -9  8  0;

    1  1  9  3].


if I use the sortrows function in Matlab B = sortrows(A). I will get this. 



B = [1    -9     8     0;

     1     1     9     3;

     1     3    11    -2;

     10   -12     4     8].


The answer I wanted is this.



B = [1   3     11     -2; 

     1  -9  8      0;

     1   1  9      3;

    10   -12     4     8]


The thing is, I want to sort my rows here but only based on column 1. if values in column 1 are same, then don't sort them according to column 2(which in genreal this function perform).



I really appreciate, if anyone can help me with this.



Thank you.






matlab sorting







share|improve this question















marked as duplicate by obchardon, Community♦ Nov 21 '18 at 8:27


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.























    1
















    This question already has an answer here:




    • Sorting entire matrix according to one column in matlab

      2 answers




    I have this matrix A,



    A= [10  -12  4  8;
    
    1  3  11 -2;
    
    1  -9  8  0;
    
    1  1  9  3].


    if I use the sortrows function in Matlab B = sortrows(A). I will get this. 



    B = [1    -9     8     0;
    
     1     1     9     3;
    
     1     3    11    -2;
    
     10   -12     4     8].


    The answer I wanted is this.



    B = [1   3     11     -2; 
    
     1  -9  8      0;
    
     1   1  9      3;
    
    10   -12     4     8]


    The thing is, I want to sort my rows here but only based on column 1. if values in column 1 are same, then don't sort them according to column 2(which in genreal this function perform).



    I really appreciate, if anyone can help me with this.



    Thank you.






    matlab sorting







    share|improve this question















    marked as duplicate by obchardon, Community♦ Nov 21 '18 at 8:27


    This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.





















      1












      1








      1









      This question already has an answer here:




      • Sorting entire matrix according to one column in matlab

        2 answers




      I have this matrix A,



      A= [10  -12  4  8;
      
    1  3  11 -2;
      
    1  -9  8  0;
      
    1  1  9  3].


      if I use the sortrows function in Matlab B = sortrows(A). I will get this. 



      B = [1    -9     8     0;
      
     1     1     9     3;
      
     1     3    11    -2;
      
     10   -12     4     8].


      The answer I wanted is this.



      B = [1   3     11     -2; 
      
     1  -9  8      0;
      
     1   1  9      3;
      
    10   -12     4     8]


      The thing is, I want to sort my rows here but only based on column 1. if values in column 1 are same, then don't sort them according to column 2(which in genreal this function perform).



      I really appreciate, if anyone can help me with this.



      Thank you.






      matlab sorting







      share|improve this question

















      This question already has an answer here:




      • Sorting entire matrix according to one column in matlab

        2 answers




      I have this matrix A,



      A= [10  -12  4  8;
      
    1  3  11 -2;
      
    1  -9  8  0;
      
    1  1  9  3].


      if I use the sortrows function in Matlab B = sortrows(A). I will get this. 



      B = [1    -9     8     0;
      
     1     1     9     3;
      
     1     3    11    -2;
      
     10   -12     4     8].


      The answer I wanted is this.



      B = [1   3     11     -2; 
      
     1  -9  8      0;
      
     1   1  9      3;
      
    10   -12     4     8]


      The thing is, I want to sort my rows here but only based on column 1. if values in column 1 are same, then don't sort them according to column 2(which in genreal this function perform).



      I really appreciate, if anyone can help me with this.



      Thank you.





      This question already has an answer here:




      • Sorting entire matrix according to one column in matlab

        2 answers







      matlab sorting




      matlab sorting






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 20 '18 at 15:49









      obchardon

      3,8221820




      3,8221820










      asked Nov 20 '18 at 15:34









      Ketan SahuKetan Sahu

      154




      154




      marked as duplicate by obchardon, Community♦ Nov 21 '18 at 8:27


      This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.









      marked as duplicate by obchardon, Community♦ Nov 21 '18 at 8:27


      This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


























          1 Answer
          1






          active

          oldest

          votes


















          4














          Sort the first column only with the function sort keep only the index, then use this index to sort the whole matrix. 



          A= [10  -12  4  8;
          
    1  3  11 -2;
          
    1  -9  8  0;
          
    1  1  9  3];
          
[~,ind] = sort(A(:,1))
          
B = A(ind,:)


          or simply use the second argument of the function sortrows which precise the column sorting vector:



          B = sortrows(A,1)





          share|improve this answer


























          • Hello, @Obchardon, Thank you so much, It'sworking, really appreciate your effort. Thank you :)

            – Ketan Sahu
            Nov 20 '18 at 15:56




















          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          4














          Sort the first column only with the function sort keep only the index, then use this index to sort the whole matrix. 



          A= [10  -12  4  8;
          
    1  3  11 -2;
          
    1  -9  8  0;
          
    1  1  9  3];
          
[~,ind] = sort(A(:,1))
          
B = A(ind,:)


          or simply use the second argument of the function sortrows which precise the column sorting vector:



          B = sortrows(A,1)





          share|improve this answer


























          • Hello, @Obchardon, Thank you so much, It'sworking, really appreciate your effort. Thank you :)

            – Ketan Sahu
            Nov 20 '18 at 15:56


















          4














          Sort the first column only with the function sort keep only the index, then use this index to sort the whole matrix. 



          A= [10  -12  4  8;
          
    1  3  11 -2;
          
    1  -9  8  0;
          
    1  1  9  3];
          
[~,ind] = sort(A(:,1))
          
B = A(ind,:)


          or simply use the second argument of the function sortrows which precise the column sorting vector:



          B = sortrows(A,1)





          share|improve this answer


























          • Hello, @Obchardon, Thank you so much, It'sworking, really appreciate your effort. Thank you :)

            – Ketan Sahu
            Nov 20 '18 at 15:56
















          4












          4








          4







          Sort the first column only with the function sort keep only the index, then use this index to sort the whole matrix. 



          A= [10  -12  4  8;
          
    1  3  11 -2;
          
    1  -9  8  0;
          
    1  1  9  3];
          
[~,ind] = sort(A(:,1))
          
B = A(ind,:)


          or simply use the second argument of the function sortrows which precise the column sorting vector:



          B = sortrows(A,1)





          share|improve this answer















          Sort the first column only with the function sort keep only the index, then use this index to sort the whole matrix. 



          A= [10  -12  4  8;
          
    1  3  11 -2;
          
    1  -9  8  0;
          
    1  1  9  3];
          
[~,ind] = sort(A(:,1))
          
B = A(ind,:)


          or simply use the second argument of the function sortrows which precise the column sorting vector:



          B = sortrows(A,1)






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 20 '18 at 15:48

























          answered Nov 20 '18 at 15:43









          obchardonobchardon

          3,8221820




          3,8221820













          • Hello, @Obchardon, Thank you so much, It'sworking, really appreciate your effort. Thank you :)

            – Ketan Sahu
            Nov 20 '18 at 15:56





















          • Hello, @Obchardon, Thank you so much, It'sworking, really appreciate your effort. Thank you :)

            – Ketan Sahu
            Nov 20 '18 at 15:56



















          Hello, @Obchardon, Thank you so much, It'sworking, really appreciate your effort. Thank you :)

          – Ketan Sahu
          Nov 20 '18 at 15:56







          Hello, @Obchardon, Thank you so much, It'sworking, really appreciate your effort. Thank you :)

          – Ketan Sahu
          Nov 20 '18 at 15:56







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