How to calculate in a matrix

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min wong 2016-11-29

评论： Laith Mohammed 2019-11-21

If I had a matrix A=[12 3 65,2 3 6,68 15 40]

I want to change second array of matrix A multiply 10

will be like A=[12 3 65,20 30 60,68 15 40]

How can I do ?

Thank you

KSSV 2016-11-29

A=[12 3 65 ;2 3 6 ;68 15 40] ;
iwant = A ;
iwant(:,2) = 10*iwant(:,2) ;

Read about matrix indexing......

min wong 2016-11-30

thank you

Laith Mohammed 2019-11-21

Good answer just reverse iwant(2,:) = 10*iwant(2,:)

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