The theory of "_mergesimpts" of builtin functions.
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I'm trying to learn the theory of the function "griddata",and in the file "griddata.m",I found some codes like: xyv = builtin('_mergesimpts', [y, x, v], [myepsy, myepsx, Inf], 'average'); I cant find the source code or theory of "_mergesimpts",can u explain the theory of it please? Thanks a lot.:)
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Walter Roberson
on 30 Mar 2016
By context I can tell that it looks for points whose x is closer than myepsx and whose y is closer than myepsy, and that if it finds them then it replaces the pair with a single point whose value is the average of the values at the other two points.
I do not know how it handles "lines" of points, A close to B close to C but A not close to C.
Peng Liu
on 22 Aug 2016
It is an undocumented built-in function, which finds unique elements/rows within a specified tolerance. You may find a detailed introduction about this functon: http://stackoverflow.com/questions/1988535/return-unique-element-with-a-tolerance
Matlab 2015a introduced a documented built-in function, uniquetol, to achieve a similar task.
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