Pre allocation in matlab

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v = [0 8 1 2 6 4 8]
How do I determine length of the vector?
Also, how do I pre-allocate the descending vector with all zeros?
Thank you!

Accepted Answer

Walter Roberson
Walter Roberson on 10 Feb 2020
length(v)
zeros(size(v))
  3 Comments
Walter Roberson
Walter Roberson on 10 Feb 2020
zeros(size(v)) works no matter whether you are planning to put ascending or descending variables; it also works even if you are planning to put complex numbers in (I mention those because complex numbers cannot generally be ordered into ascending or descending.)

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More Answers (1)

fred  ssemwogerere
fred ssemwogerere on 10 Feb 2020
leng=length(v); % length of a vector
pA=zeros(1,leng); % pre-allocation with zeros

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