How can i extract sub matrix from basic matrix

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Light
Light 2013-6-7
回答： sunny 2024-2-17
Hello. My basic matrix is
B=[-1,1,1,5+i*2;0,-1,0,20+i*10;0,0,-1,10+i*3;1,0,0,0;30+i*30,50+i*50,60+i*60,0]
Sub matrix is A
A=[-1,1,1;0,-1,0;0,0,-1;1,0,0]

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采纳的回答

Walter Roberson
Walter Roberson 2013-6-7
A = B(1:4, 1:3);

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Navadeep Ganesh U
Navadeep Ganesh U 2019-12-1
编辑：Navadeep Ganesh U 2019-12-1
A=B([1,2,3],[1,2,3])
means, We need to extract B's 1st 2nd and 3rd row along with B's 1st 2nd and 3rd column.
By this you can get approprite answer.
It can also be written as A=B([1:3],[1:3])
LoL,...............6yrs later
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sunny
sunny 2024-2-17
B=[-1,1,1,5+1i*2;0,-1,0,20+1i*10;0,0,-1,10+1i*3;1,0,0,0;30+1i*30,50+1i*50,60+1i*60,0];
B(:,end)=[];
B(end,:)=[];

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