利用Matlab进行交集、并集等运算

帮助文档：intersect Set intersection.    C = intersect(A,B) for vectors A and B, returns the values common to     the two vectors with no repetitions. C will be sorted.     C = intersect(A,B,'rows') for matrices A and B with the same     number of columns, returns the rows common to the two matrices. The    rows of the matrix C will be in sorted order.     [C,IA,IB] = intersect(A,B) also returns index vectors IA and IB such     that C = A(IA) and C = B(IB). If there are repeated common values in    A or B then the index of the last occurrence of each repeated value is    returned.     [C,IA,IB] = intersect(A,B,'rows') also returns index vectors IA and IB     such that C = A(IA,:) and C = B(IB,:).      [C,IA,IB] = intersect(A,B,'stable') for arrays A and B, returns the    values of C in the same order that they appear in A.    [C,IA,IB] = intersect(A,B,'sorted') returns the values of C in sorted    order.    If A and B are row vectors, then C will be a row vector as well,    otherwise C will be a column vector. IA and IB are column vectors.    If there are repeated common values in A or B then the index of the    first occurrence of each repeated value is returned.     [C,IA,IB] = intersect(A,B,'rows','stable') returns the rows of C in the    same order that they appear in A.    [C,IA,IB] = intersect(A,B,'rows','sorted') returns the rows of C in    sorted order.     In a future release, the behavior of the following syntaxes will change    including:      - occurrence of indices in IA and IB will switch from last to first      - orientation of vector C      - IA and IB will always be column index vectors      - tighter restrictions on combinations of classes      In order to see what impact those changes will have on your code, use:         [C,IA,IB] = intersect(A,B,'R2012a')       [C,IA,IB] = intersect(A,B,'rows','R2012a')      If the changes in behavior adversely affect your code, you may preserve    the current behavior with:         [C,IA,IB] = intersect(A,B,'legacy')       [C,IA,IB] = intersect(A,B,'rows','legacy')     Examples:        a = [9 9 9 9 9 9 8 8 8 8 7 7 7 6 6 6 5 5 4 2 1]       b = [1 1 1 3 3 3 3 3 4 4 4 4 4 10 10 10]        [c1,ia1,ib1] = intersect(a,b)       % returns       c1 = [1 4], ia1 = [21 19], ib1 = [3 13]        [c2,ia2,ib2] = intersect(a,b,'stable')       % returns       c2 = [4 1], ia2 = [19 21]', ib2 = [9 1]'        c = intersect([1 NaN 2 3],[3 4 NaN 1])       % NaNs compare as not equal, so this returns       c = [1 3]     Class support for inputs A and B, where A and B must be of the same    class unless stated otherwise:       - logical, char, all numeric classes (may combine with double arrays)       - cell arrays of strings (may combine with char arrays)       -- 'rows' option is not supported for cell arrays       - objects with methods SORT (SORTROWS for the 'rows' option), EQ and NE       -- including heterogeneous arrays derived from the same root class

简单示例：集合A：A =     1     2     3     4     5     6     7     8     9    10集合B：> B=5:2:15B =     5     7     9    11    13    15

求A∩B为：intersect（A，B）

setdiff Set difference.    C = setdiff(A,B) for vectors A and B, returns the values in A that     are not in B with no repetitions. C will be sorted.     C = setdiff(A,B,'rows') for matrices A and B with the same number of    columns, returns the rows from A that are not in B. The rows of the    matrix C will be in sorted order.     [C,IA] = setdiff(A,B) also returns an index vector IA such that    C = A(IA). If there are repeated values in A that are not in B, then    the index of the last occurrence of each repeated value is returned.     [C,IA] = setdiff(A,B,'rows') also returns an index vector IA such that    C = A(IA,:).     [C,IA] = setdiff(A,B,'stable') for arrays A and B, returns the values    of C in the order that they appear in A.    [C,IA] = setdiff(A,B,'sorted') returns the values of C in sorted order.    If A is a row vector, then C will be a row vector as well, otherwise C    will be a column vector. IA is a column vector. If there are repeated    values in A that are not in B, then the index of the first occurrence of    each repeated value is returned.     [C,IA] = setdiff(A,B,'rows','stable') returns the rows of C in the    same order that they appear in A.    [C,IA] = setdiff(A,B,'rows','sorted') returns the rows of C in sorted    order.     In a future release, the behavior of the following syntaxes will change    including:      - occurrence of indices in IA will switch from last to first      - orientation of vector C      - IA will always be a column index vector      - tighter restrictions on combinations of classes      In order to see what impact those changes will have on your code, use:         [C,IA] = setdiff(A,B,'R2012a')       [C,IA] = setdiff(A,B,'rows','R2012a')

例如，求上例中在集合A中，不在集合B中的元素。命令为setdiff(A,B)