How to check monotonity of a vector?
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How to check easily that components of a vector form a monotone (increasing) sequence or not?
1 Commento
Adam
il 15 Dic 2017
You can use
validateattributes( yourVector, { 'numeric' }, { 'vector', 'increasing' } )
if you just want to validate that it is monotonic and carry on with the code if it is while throwing an error otherwise.
Risposta accettata
KL
il 15 Dic 2017
Modificato: KL
il 15 Dic 2017
use diff
along with all maybe
a = 1:10;
isIncreasing = all(diff(a)) %or all(diff(a)>=0) if you want to allow 0 difference
1 Commento
Andreas
il 16 Mar 2022
Take care, that all is also true for negative values.
Therefore, this example has a false positive on b
a = [1:10];
b = [1 2 3 2 1 5];
isIncreasingA = all(diff(a))
isIncreasingB = all(diff(b))
To fix that, restrict to positive values of diff
isIncreasingA = all(diff(a)>0)
isIncreasingb = all(diff(b)>0)
Più risposte (1)
Walter Roberson
il 15 Dic 2017
issorted() with 'ascend' (repeats permitted) or 'strictascend' (repeats not permitted)
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