Displaying 2 results from an estimated 2 matches for "unionall".
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unicall
2010 Jun 02
2
Faster union of polygons?
Dear R-helpers,
thanks for yesterday's speeding-up tip. Here is my next query:
I have lots of polygons (not necessarily convex ones, and they never
have holes) given by x,y coordinates.
I want to get the polygon that is the union of these polygons. This is
my current method, but I am hoping there is a faster method (up to
thousands of polygons, each with ca. 40 xy points).
Example:
2011 Feb 08
4
Remove ActiveRecord::Relation#& alias for 'merge' ? (or at least only reference and not use in AR)
...com/rails/arel/commit/74caeaad157e79853b9c6804f561d3c70eea2346
and https://github.com/rails/arel/commit/d532b7ee430c5d0c412ab9f1a5e0dd3ebc47f86b
So this allows for a higher level abstraction to use the Array class''
convention:
''|'' => Union
''+'' => UnionALL
''&'' => Intersect
''-'' => Except (Minus for Oracle)
to operate on two ActiveRecord::Relation instances.
This is sitting as a pending pull request on MetaWhere:
https://github.com/ernie/meta_where/pull/12
Ernie Miller and I have been going back and fort...