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Matrix manipulation by function

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Lila wagou
Lila wagou 2017-4-6
评论： Lila wagou 2017-4-7
Dear all, For a given matrix (square) i need to eliminate some elements (some rows and columns)
A =
35 6 19
3 7 23
31 2 27
I need only the second (not the first and the third) row and column : the eliminated are stocked in a vector
B = (1 3)
So : some function (A, B) :::> the result C = 7
function (A, B) = C
  2 个评论
Lila wagou
Lila wagou 2017-4-6
Dear KSSV, i need a function for lot of use
A1 =
35 6 19
3 7 23
31 2 27
and
B1 = (1 3)
C1 = 7
or
A2 =
35 6 19 11
3 7 23 44
31 2 27 55
31 2 27 55
and
B2 = (2 3)
C2 =
35 11
31 55

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2017-4-6
ii = num2cell([1;1]*setdiff(1:length(A),B(:)'),2);
out = A(ii{:});
  8 个评论
显示 6更早的评论
Lila wagou
Lila wagou 2017-4-7
Dear Andrei; please how to trait a vector (eliminate the elements stocked in a vector by order)
A = [10 52 33]
B = [3]
ii = num2cell([1]*setdiff(1:length(A),B(:)'),1);
out = A(ii{:});
i get out = 52 so i must get out = 10 52

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更多回答（1 个）

Fangjun Jiang
Fangjun Jiang 2017-4-6
C=A;
C(B,:)=[];
C(:,B)=[]

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