Pre allocation in matlab

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Seoyoung Cho
Seoyoung Cho 2020-2-10
评论： Walter Roberson 2020-2-10
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!

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Walter Roberson
Walter Roberson 2020-2-10
length(v)
zeros(size(v))
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Seoyoung Cho
Seoyoung Cho 2020-2-10
do you know how to do pre-allocate the ascending vector with all zeros?
Walter Roberson
Walter Roberson 2020-2-10
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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更多回答（1 个）

fred ssemwogerere
fred ssemwogerere 2020-2-10
leng=length(v); % length of a vector
pA=zeros(1,leng); % pre-allocation with zeros

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