MATLAB: Find values and positions of a matrix referring to another matrix

MATLABmatricesmatrixmatrix arraymatrix manipulation

Hi !!! Good day.

I hope you can help me

I have two matrices

A = [2 4 7];

B = [3 4 6

1 5 7

2 8 9

9 2 4];

From the first element of matrix A find position and value in the first column of matrix B

From the second element of matrix A find position and value in the second column of matrix B

From the third element of matrix A find position and value in the third column of matrix B

In the end I will have two vectors;

one with the values 2, 4, 7 and the other with the positions 3, 1, 2

In reality, matrix A is 1 X 18 and matrix B has 720 X 18

Thank you very much for your help.

Regards.

Best Answer

for i=1:length(A)
C(i)=find(B(:,i)==A(i),1);%will there always be only one match?
end

Related Solutions

MATLAB: N=A(B) where A and B are matrices

A(B) returns the value of the B(ith) element of A. The elements are counted column-wise, what means than in your case: A(1) = 1; A(2) = 4; A(3) = 2; A(4) = 8; A(5) = 3; ... A(18) = 8;

Now, if you take the matrix B as index, you get back a matrix whose elements are the elements of A in the position determined by the value of the element of B:

B(1) = 5

then, the first element of A(B) = A(5) = 3.

B(2) = 9

then, the second element of A(B) = A(9) = 3

B(3) = 1

then, the second element of A(B) = A(1) = 1

and so on.

MATLAB: How to sort matrix based on another matrix

>> A = [3,2,1;8,3,1;6,4,2]
A =
  3  2  1
  8  3  1
  6  4  2
>> B = [5,9,2;9,2,1;8,7,4]
B =
  5  9  2
  9  2  1
  8  7  4
>> [A,X] = sort(A,2);
>> for k = 1:size(X,2), B(k,:) = B(k,X(k,:)); end
>> A
A =
  1  2  3
  1  3  8
  2  4  6
>> B
B =
  2  9  5
  1  2  9
  4  7  8

Best Answer

Related Solutions

MATLAB: N=A(B) where A and B are matrices

MATLAB: How to sort matrix based on another matrix

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