N = 1024 ^ 2; A = [ones(N), ones(N), ones(N), ones(N)]; The naive way of summing the arrays in A would be to do sum(A). However, note the performance: julia> @btime sum(A); 7.968 ms (6 allocations: 24.00 MiB) It unnecessarily allocates an array of size N for each addition (3x8 MB). Is there a w…

Summing arrays efficiently

baggepinnen September 22, 2018, 2:20pm 10

Yes you are right!

Topic		Replies	Views
Summing a vector of vectors in a non-allocating way Performance memory-allocation , arrays	10	2674	November 27, 2021
New array from a sum of N values in array A? General Usage tullio	8	1677	September 12, 2020
Summation of rows of array without allocation General Usage	1	1360	July 18, 2020
Array cumulation General Usage array	4	487	December 23, 2020
Assistance in avoiding allocations in summations Performance	8	834	March 18, 2019