How to fill arrays third column by matching first 2 columns

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sastra university
sastra university 2022-10-19
评论： sastra university 2022-10-19
Dear all,
I have 2 arrays namely A & B.
A is 30 x 3 array with 3rd column zero.
B is 15 x 3 array with the result value in the 3rd column.
I want to fill the 3rd column of A by matching the first 2 columns with B.
for example,
A=[1 5 0;
1 12 0;
4 5 0;
4 9 0;
7 8 0;
8 2 0;
9 13 0];
B = [1 5 2740;
1 12 10;
8 2 1500;
7 8 750];
I want to get the array A's 3rd column filled with the values by comparing B.
results like,
A = [1 5 2740;
1 12 10;
4 5 0;
4 9 0;
7 8 750;
8 2 1500;
9 13 0];
Please suggest me a code for doing this for the larger size of array.
Thank you in advance.

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采纳的回答

KSSV
KSSV 2022-10-19
Ran in:
A=[1 5 0;
1 12 0;
4 5 0;
4 9 0;
7 8 0;
8 2 0;
9 13 0];
B = [1 5 2740;
1 12 10;
8 2 1500;
7 8 750];
F = scatteredInterpolant(B(:,1),B(:,2),B(:,3)) ;
A(:,3) = F(A(:,1),A(:,2)) ;
A
A = 7×3
1.0e+03 * 0.0010 0.0050 2.7400 0.0010 0.0120 0.0100 0.0040 0.0050 1.9946 0.0040 0.0090 0.7700 0.0070 0.0080 0.7500 0.0080 0.0020 1.5000 0.0090 0.0130 -0.8471
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KSSV
KSSV 2022-10-19
Ran in:
A=[1 5 0;
1 12 0;
4 5 0;
4 9 0;
7 8 0;
8 2 0;
9 13 0];
B = [1 5 2740;
1 12 10;
8 2 1500;
7 8 750];
[c,ia] = ismember(B(:,1:2),A(:,1:2),'rows','legacy') ;
A(ia,3) = B(:,3)
A = 7×3
1 5 2740 1 12 10 4 5 0 4 9 0 7 8 750 8 2 1500 9 13 0

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