Example11(June 9,2015)

%--------------sort-------------------------------
>> A=[9 3;8 2;1 5]
A =

9     3
8     2
1     5
>> B=sort(A,2)%A(:,1)<=A(:,2)
B =
3     9
2     8
1     5
%---------------END-----------------------------------
%--------------reshape-------------------------------
>> j=1:6;
>> NT=2;
>> A=reshape(j,NT,3)或者A=reshape(j',NT,3)
%讲一个行(列)向量转化为一个指定规模的矩阵(NT*3)
A =
1     3     5
2     4     6
%---------------END-----------------------------------
%--------------unique---------------------------------
>> node=[0 0;1 0;1 1;0 1];
>> elem=[1 2 4;2 3 4];
>> totalEdge=sort([elem(:,[2,3]);elem(:,[3,1]);elem(:,[1,2])],2);
>> totalEdge=sort([elem(:,[2,3]);elem(:,[3,1]);elem(:,[1,2])],2)
totalEdge =
2     4
3     4
1     4
2     4
1     2
2     3
>> [edge,i2,j]=unique(totalEdge,'rows')
edge = %去掉totalEdge中重复的边,edge(:,1)由小到大向下排
1     2
1     4
2     3
2     4
3     4
i2 =
5
3
6
4
2
j =
4
5
2
4
1
3
%--------------END------------------------------------