What is the difference between knnsearch and rangesearch?

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Atiqah Zakirah
Atiqah Zakirah 2017-5-15
回答： KSSV 2017-5-15
I need to find the number of data points within a circle of a 10 km radius. The data would be the latitude and longitude coordinates of my location point. Which function would be the best approach?

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KSSV
KSSV 2017-5-15
difference is:
knnsearch: For a given positive integer K, knnsearch finds K points in X that are nearest each Y point.
rangesearch: for a given positive real value r, rangesearch finds all the X points that are within a distance r of each Y point.
So in your case if you want all the points (lat,lon) which are in a radius 10 kms, you have to use rangesearch

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