锛?/p>
1
锛変骇鐢熶竴涓?/p>
5
闃堕瓟鏂圭煩闃?/p>
M
锛?/p>
M=magic(5)
锛?/p>
2
锛夊皢鐭╅樀
M
鐨勭
3
琛?/p>
4
鍒楀厓绱犺祴鍊肩粰鍙橀噺
t
锛?/p>
t=M(3,4)
锛?/p>
3
锛夊皢鐢辩煩闃?/p>
M
绗?/p>
2
锛?/p>
3
锛?/p>
4
琛岀
2,5
鍒楁瀯鎴愮殑瀛愮煩闃佃祴缁欏彉
N
锛?/p>
N=M(2:4,2:3:5)
锛?/p>
4
锛夊皢鐢辩煩闃?/p>
M
鐨勫墠
3
琛岃祴缁欏彉閲?/p>
N
锛?/p>
N=M(1:3,:)
锛?/p>
5
锛夊皢鐢辩煩闃?/p>
M
鐨勫悗
3
鍒楄祴缁欏彉閲?/p>
N
锛?/p>
N=M(:,end:-1:end-2)
锛?/p>
6
锛?/p>
鎻愬彇
M
鐨勪富瀵硅绾垮厓绱狅紝
骞朵互杩欎簺瀵硅绾垮厓绱犳瀯鎴愬瑙掔煩闃?/p>
N
锛?/p>
N=diag(diag(M))
鎴?/p>
N=tril(triu(M))
(7)
闅忔満浜х敓
1000
涓?/p>
100
浠ュ唴鐨勬暣鏁拌祴鍊肩粰鍙橀噺
t
锛?/p>
t=round(rand(1,1000)*100)
锛?/p>
8
锛夐殢鏈轰骇鐢?/p>
100*5
涓?/p>
100
浠ュ唴鐨勫疄鏁拌祴鍊肩粰鍙橀噺
M
锛?/p>
M=rand(100,5)*100
锛?/p>
1
锛夊垹闄ょ煩闃?/p>
M
鐨勭
7
涓厓绱?/p>
M(7)=[]
锛?/p>
2
锛夊皢鍚湁
12
涓厓绱犵殑鍚戦噺
t
杞崲鎴?/p>
3*4
鐨勭煩闃碉細
reshape(t,3,4)
锛?/p>
3
锛変骇鐢熷拰
M
鍚屾牱澶у皬鐨勫崟浣嶇煩闃碉細
eye(size(M))
锛?/p>
4
锛夊鎵惧悜閲?/p>
t
涓潪闆跺厓绱犵殑涓嬫爣锛?/p>
find(t)
锛?/p>
5
锛夐�嗗簭鏄剧ず鍚戦噺
t
涓殑鍏冪礌锛?/p>
t(end:-1:1)
锛?/p>
6
锛夋樉绀哄悜閲?/p>
t
鍋舵暟浣嶇疆涓婄殑鍏冪礌锛?/p>
t(2:2:end)
锛?/p>
7
锛夊埄鐢?/p>
find
鍑芥暟锛屽皢鍚戦噺
t
涓皬浜?/p>
10
鐨勬暣鏁扮疆涓?/p>
0
锛?/p>
t(find(t<10&rem(t,1)==0))=0
锛?/p>
8
锛変笉鐢?/p>
find
鍑芥暟锛屽皢鍚戦噺
t
涓皬浜?/p>
10
鐨勬暣鏁扮疆涓?/p>
0
锛?/p>
t(t<10&rem(t,1)==0)=0
锛?/p>
9
锛夊皢鍚戦噺
t
涓殑
0
鍏冪礌鐢ㄦ満鍣?/p>
0
锛?/p>
realmin
锛夋潵浠ｆ浛锛?/p>
t(find(t=0))=realmin
锛?/p>
10
锛夊皢鐭╅樀
M
涓皬浜?/p>
10
鐨勬暣鏁扮疆涓?/p>
0
锛?/p>
M(find(M<10)&rem(M,1)==0)=0
2
銆佸啓鍑哄畬鎴愪笅鍒楁搷浣滅殑鍛戒护鍙婄粨鏋溿�?/p>
锛?/p>
1
锛夊皢
1~50
杩?/p>
50
涓暣鏁版寜琛屼紭鍏堝瓨鏀惧埌
5*10
鐨勭煩闃典腑锛屾眰璇ョ煩闃靛洓鍛ㄥ厓绱犵殑鍜岋紱
>> t=[1:10];
>>
M=[t;t+10;t+20;t+30;t+40]
M =
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
>>
N=M(2:4,2:9)
N
=
12
13
14
15
16
17
18
19
22
23
24
25
26
27
28
29
32
33
34
35
36
37
38
39
>> sum(sum(M))-sum(sum(n))
ans =
663
2
锛?/p>
n
鍙?/p>
100
銆?/p>
1000
銆?/p>
10000
锛屾眰搴忓垪
1
銆?/p>
1/2
銆?/p>
1/3
鈥炩�?/p>
1/n
鐨勫拰銆?/p>