On 1 May 2018, at 5:34pm, Roman Fleysher <roman.fleys...@einstein.yu.edu> wrote:

> With recursive route, I am thinking I need to build deleteList(x,y).

Rather than actually delete rows, if you can, insert a new column in the table 
of all points.  It starts with every row set to TRUE.  When you decide a row 
doesn't count the value gets set to FALSE.

This will be faster than doing the processing and file handling involved in 
deleting rows.

Simon.
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