Performance of Array Addition
- To: mathgroup at smc.vnet.net
- Subject: [mg90952] Performance of Array Addition
- From: Jeremy <jeremytfox at mac.com>
- Date: Thu, 31 Jul 2008 02:57:38 -0400 (EDT)
Let there be, for example, an array of reals with dimensions
{d1,d2,3}.
I have noticed that the command
array[[All,All,1]] + array[[All,All,2]] + array[[All,All,3]];
is much faster than
Map[Total, array, {2}];
even though they return the same answer.
The advantage of Map[Total, array, {2}] is that it allows arrays of
dimension {d1,d2,d3}, with d3 arbitrary.
Is there a way to get closer to the speed advantages of hand-coding
the addition of the final dimension, while
allowing the number of elements in the final dimension to be
arbitrary?
Thanks, Jeremy