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create a vector which counts down from 200 to 0 by two. How to make every other being negative

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AnhThu Le
AnhThu Le 2017-9-1
评论： Kacy Hele 2022-11-10
create a vector which counts down from 200 to 0 by two with every other entry being negative I already can create a vector from 200 to 0 by 2: X= [200:-2:0] How to make every other entry being negative

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KSSV
KSSV 2017-9-1
X= [200:-2:0] ;
X(1:2:end) = -X(1:2:end) ;

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