How Can I count the ascending runs in array ?

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Willim
Willim 2019-2-18
评论： Willim 2019-2-18
if I have an array such as
x=[1 2 3 2 1 2 4 5]
I would generate a binary array for binary search
binaryarray= [1 1 1 0 0 1 1 1]
in binaryarry i would sign 1 along with ascending runs while 0 along with descending runs.
  2 个评论
Willim
Willim 2019-2-18
I used it
v=diff(x)
v(v>=0)=1
v(v<0)=0
but it give me wrong result for larger x

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回答（1 个）

Stephen23
Stephen23 2019-2-18
编辑：Stephen23 2019-2-18
As KSSV wrote, you might find diff useful:
>> y = y([1,1:end])
y =
1 1 1 0 0 1 1 1

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