%例6-6  用eval函數生成3到5階的magic矩陣。
>>for n = 3:5
           eval(['M' num2str(n) ' = magic(n)'])
        end
%在命令窗口中輸入以上程序，并按Enter鍵確認，此時運算結果如下：
>> for n = 3:5
           eval(['M' num2str(n) ' = magic(n)'])
        end
M3 =
     8     1     6
     3     5     7
     4     9     2
M4 =
    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1
M5 =
    17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9
>>




>> famous1={'GREAT WALL';'SUMMER PALACE';'JIU ZHAI GOU'};
>> famous2={'GREAT WALL';'TAI MOUNTAIN';'ZHANG JIA JIE'};
>> N=strcmp(famous1,famous2)
N =
     1
     0
     0
>> N=strncmp(famous1,famous2,1)
N =
     1
     0
     0
>> N=strncmp(famous1,famous2,3)
N =
     1
     0
     0
>>