查找B中包含但不在A - MATLAB中的列向量

Question

I have matrix A of size 10x100 and matrix B with size 10x200 .

How to find the column vectors contained in B but not in A ? ( A and B do not have the same number of columns)

Answer 1

to elaborate @Cheery's comment with an example.

A=[1;4];
B=[1 2 4;4 5 6];
C=setdiff(B',A','rows')';

more details see http://www.mathworks.com/help/matlab/ref/setdiff.html

Answer 2

You can also use bsxfun here -

Bout = B(:,all(any(bsxfun(@ne,B,permute(A,[1 3 2])),1),3))

Sample run -

A =
     2     2     2     2     2
     2     2     1     1     1
     1     1     2     1     3
B =
     3     2     3     2     1     2     2
     3     1     3     1     1     1     3
     2     3     1     2     1     2     3
Bout =
     3     3     1     2
     3     3     1     3
     2     1     1     3