Find range of values where 80% lies

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Somto Dibiaezue
Somto Dibiaezue 2018-5-4
评论： Somto Dibiaezue 2018-5-11
Hi,
I've got gradually changing data set in an array, and I'm trying to find the threshold where 80% of the data lies below and hopefully get the corresponding indices. A Gaussian distribution takes it about the mean but using this will also most definitely remove the "good" data.
The picture shows an example were I'm trying to eliminate data < 1.35(red x-axis). There seems to be loads of other distributions but the information is overwhelming. Would be helpful if someone can point in the right direction.
Thanks.
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jonas
jonas 2018-5-4
编辑：jonas 2018-5-4
Perhaps I'm misunderstanding the issue. Why don't you just find the 20th percentile and remove all values below that?
th=prctile(xdata,20)
xdata(xdata<th)=[];
ydata(xdata<th)=[];

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