1) If I have a 2d array in x10 is there an easy way to extract the
subarrays along a single dimension (e.g. suppose I have a 2d array
representing the matrix
[1 2
3 4]
Is there an easy way to get an array that is the row vector [1 2]
Hi Daniel --
I don't have a complete answer, but a direction you could go in to
develop one. And also others may have something to share. Indeed, Dave
Grove and Olivier Tardieu and others are re-designing arrays / rails to
ensure efficiency for the basic case of rectangular multi-dim arrays, so
this is a somewhat timely question.
The direction I would suggest is to actually write your own wrapper
ArraySection[T] class that operates like an Array and implements its
operations by passing them on to the contained Array. Actually, this is
very much how x10.lang.Array is implemented already -- it encapsulates
an "IndexedMemoryChunk", an efficient primitive representation of a
array of T over the region 0..(N-1), and implements all operations by
performing them on this state, using @Inline etc. You could ignore the
@Native("cuda"....) annotations for now .. or ask David Cunningham for
more information about how they are supposed to work.
You can start by looking at the code for Array and simply modifying it
appropriately. This would be a worthwhile thing to do. You would get
exposed to defining your own operators (e.g. for indexed access and
update). And it might make the code for Lulesh look cleaner.
Dave Grove has thought more deeply about how to do Arrays efficiently
(and implemented the Array code) and may have additional ideas to share.
Best,
Vijay
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