Check if vector is increasing monotonely or just increasing

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am
am 2019-3-22
编辑： Rik 2023-2-2
Hello,
I have to check if the elements in a vector are in increasing order (or even equal to each other). In that case the function should return true. But if the following element is smaller, it should return false.
The function below doesn't pass tests if my vector is not monotonous, and I can't understand why?
function t = is_increasing(x)
k = 1
for k = 1:(length(x)-1)
if x(k+1) - x(k) > 0 || x(k+1) - x(k) == 0
t = true
k = k + 1
else
t = false
return
end
end
end

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采纳的回答

KSSV
KSSV 2019-3-22
编辑：Rik 2023-2-2
Refer here: http://matlabtricks.com/post-29/pattern-search-example-monotonically-increasing-or-decreasing-subset
YOu should read about diff. You can search this question in google. It is asked multiple times.
Edit @Rik: replaced link with archive link, as the original website seems down.

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