How can i ignore a trend for the first part of an array?

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yashvin
yashvin 2016-8-22
回答： KSSV 2016-8-22
Hi, I have an array which represents a change of altitude values:
A = [0,10,50,100,170,230,300,400,500,600,700,450,250,220,200,190,180]
I want to find the index of the values which are less than 240. In the above array, we have 2 solutions: either the number 230 which is index 6 or number 220 which is index 14. How can i ignore the first index so that in the end i always get the second index which is 14 ?
My trend is always increase of altitude, then decrease of altitude..

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KSSV
KSSV 2016-8-22
To find the indices which are less then 240 use:
idx = find(A<240) ; % idx are the indices

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