matrix manipulation : ind of wanted rows and columns stocked in a vector

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Lila wagou 2017-4-7

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关闭： MATLAB Answer Bot 2021-8-20

Dear all, for a square matrix is it possible to get only the the first and the third (not the second) rows and columns : the wanted are stocked in a B vector

A = 
          35     6    19
           3     7    23
          31     2    27
  B = (1 3)
  C = function (A, B)
  C = 
            35     19
            31     27

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Answer 1

David Goodmanson 2017-4-7

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编辑：David Goodmanson 2017-4-7

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Hi Lila, you just have to make an index vector:

B = [1 3];
C = A(B,B)

The row index is the first listed and the column index is second, and these can be independent:

>> A = magic(5)
A = 17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9
>> C = A([1 3 4],[3 5])
C =  1    15
    13    22
    19     3