matrix C from A and B

Hey again I want function that gives matrix C from A and B thanks

in fact if we have the same raw in A and B , we delete it and the result will be the matrix C

[Image Analyst]

So? Do you have a question?

[Geoff Hayes]

A little more detail is required...how is C to be constructed from A and B?

[Firas]

in fact if we have the same raw in A and B , we delete it and the result will be the matrix C

[Geoff Hayes]

So is your algorithm to find all rows that are distinct in A and B, assuming that A and B have the same number of columns?

[Firas]

yes

[Image Analyst]

firas, it's like pulling teeth to get you to help us help you. I mean, most people would give example arrays for A, B, and C . Sure I can make up something, but why are you putting the burden on us? Why not make it EASY for us to help you ? Here, read this and then fix your post: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[Geoff Hayes]

If your algorithm is to remove all rows that are common to A and B, and we are assuming that these two matrices have the same number of columns, then try the following:

 A = [1 2 3; 4 5 6; 7 8 9; 10 20 30];
 B = [11 12 13; 4 5 6; 14 15 16; 7 8 9; 17 18 19];

 if size(A,2)==size(B,2)

   % get the intersection of A and B, i.e. all those rows that are common
   [Rows,IA,IB] = intersect(A,B,'rows');

   % Rows is a matrix of the rows common to A and B
   % IA is all the row numbers in A of those common rows
   % IB is all the row numbers in B of those common rows

   % remove all those common rows from A and B
   A(IA,:) = [];
   B(IB,:) = [];

   % concatenate what is left to get C
   C = [A;B];

 end

[Firas]

thank you , it s working

Answer 2

[Sean de Wolski]

Or use setxor

>> C = setxor(A,B,'rows')