compare two vectors then insert missing element

Question

james sinos 2021-4-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/816405-compare-two-vectors-then-insert-missing-element

回答： Stephen23 2021-4-29

i have a matrix :

A=[  1.000   0.5860   0.01403    
        2.500   0.7395   0.01277   
        3.500   0.8450   0.01146   
        4.000   0.8967   0.01173   
        4.500   0.9476   0.01215   
        5.000   0.9962   0.01280    
        6.000   1.0973   0.01367   
        6.500   1.1398   0.01457   
        7.000   1.1889   0.01515    
        8.000   1.2574   0.01915   
        8.500   1.2816   0.02234   
        9.500   1.3300   0.02731   
      10.500   1.3267   0.03649  ]

for the first column let say its

B=[    1.000 
          1.500 
          2.000 
          2.500 
          3.500 
          4.000 
          4.500 
          5.000 
          5.500 
          6.000 
          6.500 
          7.000 
          7.500 
          8.000 
          8.500
          9.000
          9.500 
       10.000 
       10.500] 

i want to compare A(:1) with b then insert missing rows to make A(:,1) = b , then perform interpolation for A(:,2) and A(:,3) new rows

thanks

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Chunru 2021-4-29

在 MATLAB Online 中打开

Bq = sort(union(B, A(:,1)));            % the query points are from B and A(:,1)
C = interp1(A(:, 1), A(:, 2:end), Bq);  % Interpolation
C = [Bq C];                             % The result

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Answer 1

Stephen23 2021-4-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/816405-compare-two-vectors-then-insert-missing-element#answer_687475

在 MATLAB Online 中打开

Simpler:

A=[  1.000   0.5860   0.01403    
        2.500   0.7395   0.01277   
        3.500   0.8450   0.01146   
        4.000   0.8967   0.01173   
        4.500   0.9476   0.01215   
        5.000   0.9962   0.01280    
        6.000   1.0973   0.01367   
        6.500   1.1398   0.01457   
        7.000   1.1889   0.01515    
        8.000   1.2574   0.01915   
        8.500   1.2816   0.02234   
        9.500   1.3300   0.02731   
      10.500   1.3267   0.03649  ];
B = 1:0.5:10.5;
C = interp1(A(:,1),A,B(:))
C = 20×3
    1.0000    0.5860    0.0140
    1.5000    0.6372    0.0136
    2.0000    0.6883    0.0132
    2.5000    0.7395    0.0128
    3.0000    0.7923    0.0121
    3.5000    0.8450    0.0115
    4.0000    0.8967    0.0117
    4.5000    0.9476    0.0121
    5.0000    0.9962    0.0128
    5.5000    1.0467    0.0132