sum . , MATLAB, , . : , sum , . , MATLAB -, , , , :
>> M=[1 -2 -4; 3 -6 4; 2 -2 0];
>> s=sum(M)
s =
6 -10 0
sum , . , sum , ,
>> s2=sum(M,2)
s2 =
-5
, sum(M) sum(M,1) . , sum , , -. prod:
>> p=prod(M)
p =
6 -24 0
>> p2=prod(M,2)
p2 =
-72
sort . sort , , :
>> MC=sort(M) >> MR=sort(M,2)
MC = MR =
1 -6 -4 -4 -2 1
2 -2 0 -6 3 4
3 -2 4 -2 0 2
, sort . sort :
>> [MC, Ind]=sort(M)
MC =
1 -6 -4
2 -2 0
3 -2 4
Ind =
1 2 1
3 1 3
2 3 2
max min -, :
>> mx=max(M) >> mn=min(M)
mx = mn =
3 -2 4 1 -6 -4
, , max min :
>> [mx,k]=max(M) >> [mn,n]=min(M)
mx = mn =
3 -2 4 1 -6 -4
k = n =
2 1 2 1 2 1
, M . . .
rot90, 90 . :
>> P=[4 3 -1; 2 0 7]
P =
4 3 -1
2 0 7
>> q1=rot90(P)
q1 =
-1 7
3 0
4 2
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