How to sum up elements of a std::vector? - Stack Overflow
377 What are the good ways of finding the sum of all the elements in a std::vector? Suppose I have a vector std::vector<int> vector with a few elements in it. Now I want to find the sum of all …
Concise vector adding in Python? - Stack Overflow
May 1, 2015 · Concise vector adding in Python? [duplicate] Asked 16 years, 7 months ago Modified 3 years ago Viewed 132k times
c# - Writing a vector sum function with SIMD (System.Numerics) …
May 19, 2021 · 5 I wrote a function to add up all the elements of a double[] array using SIMD (System.Numerics.Vector) and the performance is worse than the naïve method. On my …
c++ - Sum values of 2 vectors - Stack Overflow
Feb 19, 2015 · Is there any implemented method in the C++ library which allows you to sum the values of two vectors (of the same size and type of course)? For example: …
c++ - Summing struct members inside a vector - Stack Overflow
Aug 24, 2013 · typedef struct { int a; int b; int c; int d; } ABCD; typedef std::vector<ABCD> VecABCD; Say I wanted to add up every 'a' member in a vector of type VecABCD. Easy! I just …
Fastest way to do horizontal SSE vector sum (or other reduction)
Given a vector of three (or four) floats. What is the fastest way to sum them? Is SSE (movaps, shuffle, add, movd) always faster than x87? Are the horizontal-add instructions in SSE3 worth …
how to sum up a vector of vector int in C++ without loops
Nov 3, 2019 · I try to implement that summing up all elements of a vector<vector<int>> in a non-loop ways. I have checked some relevant questions before, How to sum up elements of a C++ …
c++ - Get the sum of a vector - Stack Overflow
How do I return the sum of this vector array of integers? The code I have below returns the wrong value.
sse - How to sum __m256 horizontally? - Stack Overflow
Nov 4, 2012 · use sse to compute horizontal sum of the lower part; shuffle YMM high / low parts, use sse again and sum up the two scalars. or wait for avx2.
How to count TRUE values in a logical vector - Stack Overflow
Though, I think with a simple task like this it does not really make a difference... If it is a large vector, you probably should go with the fastest solution, which is sum(z). length(z[z==TRUE]) …