# find valleys of one peak

7 views (last 30 days)
Ahmed Alalawi on 5 Mar 2020
Answered: Dinesh Yadav on 9 Mar 2020
Hi there
I need to find the valleys of one peak on Y axis (see attached picture).
I have hundreds of observations and would be nice if any one could provide me with the code to do that.
The data is attached
Thank you in advance.

KSSV on 5 Mar 2020
What do you want? mean of the curve lying inside the rectangle? or the peak value?
Ahmed Alalawi on 5 Mar 2020
hi
I want the mean of the curve lying inside the rectangle.

Dinesh Yadav on 9 Mar 2020
To get the mean of values as shown in plot you need to know for what is the range of x. For eg let us assume you need to know the mean of values where x ranges from 1.5 to 2.
ind = (x>1.5 & x<2); %find indices in x array where x is greater than 1.5 but less than 2
selx = x(ind); % create an array of x values where ind is 1
sely = y(ind); % create corresponding y values array
plot(selx,sely);
mean_y = mean(sely);

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