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[task #14639] Select rows that are within a given polygon

From: Mohammad Akhlaghi
Subject: [task #14639] Select rows that are within a given polygon
Date: Sat, 9 May 2020 21:43:25 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:76.0) Gecko/20100101 Firefox/76.0

Follow-up Comment #17, task #14639 (project gnuastro):

Just a small point on the current implementation: you don't know the type of
the two columns, they may be anything: uint8_t, int16_t, or float64. They may
also have different types: one of them uint8_t, another float64! 

So you should also write a step to write the values of each row into the
`point' array (which is float64), based on the different types of each column.
You can see several examples of such tests with a `switch' statement on
`col->type' in `lib/statistics.c'.


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