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Double the values of an 2D array

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Chris Dan
Chris Dan 2020-8-17
回答： KSSV 2020-8-17
Hello,
I have a 2D array called Numerical_3, I want to double the values of its rows, except the first row. I have attached the picture
This is the code I am using
Numerical_3 = cell2mat(Numerical_2)
P1 = Numerical_3( :,1);
P2 = Numerical_3( :,2)
P1(2:end-1) = 2*P1(2:end-1);
P2(2:end-1) = 2*P2(2:end-1);
But it is not giving me correct results..
I want to double the values from row 2 till end,
does anybody know?

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采纳的回答

KSSV
KSSV 2020-8-17
Let A be your n*2 matrix. To double from second row use:
A(2:end,:) = 2*A(2:end,:) ;

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