Calculate percentile when logical is true
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I am looking at a large data set from NASA flight. I am only interested in points when the airplane is higher than 8 km so I set up a logical:
alt8= alt > 8
which gives me back points with 0 (false) or 1 (true) corresponding with points below or above 8 km
Using only these true points when the height is >8, I would like to find the 99th percentile of another data point, vertical velocity.
vv99=prctile(vv,99)
In other words, I need to find the 99th percentile of vertical velocity when alt>8 rather than the 99th percentile for the entire flight.
What kind of loop or statement should I use to extract just the points when alt>8?
Thank you!
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