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How can I slove the maxtric

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Tran David
Tran David on 17 Feb 2021
Commented: Tran David on 17 Feb 2021
HI all, I'm not understanding how the code computes a C matrix . pls help me
i am a newbie...
A=[2;0;0;0;1]
B=[5;1;4;1]
C=A(B,1)
---> C=[ 1;2;0;2]

Answers (2)

John D'Errico
John D'Errico on 17 Feb 2021
You want to slove a matrix? Sorry. Valentines day was 3 days ago. Too late for s"love".
A is a column vector, composed of the elements [2 0 0 0 1].
B is a vector, used to index into the matrix (or vector) A.
What is the 5th element of A? Hint: Matlab uses a 1 based index system. So the 5th element of A is 1. Likewise, the 1st element of A is 1, etc.
  1 Comment
Tran David
Tran David on 17 Feb 2021
<3 thanks for your help.

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David Hill
David Hill on 17 Feb 2021
C is produced from indexing the values of B into A.
A(5)=1;A(1)=2;A(4)=0;A(1)=2;
C=A(B);%don't need the 1
  1 Comment
Tran David
Tran David on 17 Feb 2021
I’m extremely grateful for you

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