accumulate Questions
4
I have Example Class:
class Example {
private:
int testValue1;
int testValue2;
int testValue3;
public:
Example(int pVal1, int pVal2, int pVal3);
Example(const Example);
const Example oper...
Durkheim asked 17/10, 2013 at 11:32
2
Solved
I need to sum up some vectors; that is, I want to sum the nth elements of every vector and make a new vector with the result. (I've already ensured that the input vectors are all the same size.) I'...
Joost asked 13/5, 2020 at 21:46
1
Solved
I think it is confusing that there is no parallel version of std::accumulate in the C++ standard. It appears to me that it would be trivial to implement it in parallel, for instance, based on OpenM...
Selfpronouncing asked 6/9, 2023 at 0:19
6
Solved
I have a standard library container of large numbers, so large that they may cause overflow if I add them together. Let's pretend it's this container:
std::vector<int> v = {1, 2, 3, 4, 5, 6,...
Billiot asked 16/4, 2015 at 20:8
25
time_interval = [4, 6, 12]
I want to sum up the numbers like [4, 4+6, 4+6+12] in order to get the list t = [4, 10, 22].
I tried the following:
t1 = time_interval[0]
t2 = time_interval[1] + t1
t...
Hughes asked 8/4, 2013 at 21:15
5
Solved
I am simply trying to add values of a map defined in the program below:
std::map<int, int> floor_plan;
const size_t distance = std::accumulate(std::begin(floor_plan), std::end(floor_plan), ...
Symbolics asked 11/7, 2015 at 8:8
1
Based on the answer to How to vectorize an operation that uses previous values?, I am not able to answer the following question I have:
Is there a way to vectorize the Value End Of Period (VEoP) co...
Symposiac asked 10/7, 2022 at 5:27
1
Solved
I want to use the new parallel facilities of C++17 but my computer don't.
This works :
finalOutline.push_back(std::accumulate(intermediateCoefs.begin(), intermediateCoefs.end(),origin,[](sf::Vector...
Krein asked 12/2, 2022 at 16:36
2
Solved
I am trying to combine std::accumulate with std::min. Something like this (won't compile):
vector<int> V{2,1,3};
cout << accumulate(V.begin()+1, V.end(), V.front(), std::min<int>...
Antitoxic asked 24/7, 2012 at 7:43
6
Solved
Let's say I have data test (dput given) where a list-col say items:
test <- structure(list(items = list('a', c('b', 'c'), c('d', 'e'), 'f', c('g', 'h')),
ID = c(1,1,1,2,2)), row.names = c(NA, 5...
Wanonah asked 16/5, 2021 at 13:27
2
Solved
I have recently come across an interesting question of calculating a vector values using its penultimate value as .init argument plus an additional vector's current value. Here is the sample data s...
Tact asked 28/7, 2021 at 15:48
2
Solved
I have a dataset of patients getting treatments in various hospitals (in-patient only) wherein some analysis has revealed several inconsistencies. One of these was that - software was allowing pati...
Bogart asked 21/12, 2020 at 7:23
3
Solved
The data frame contains two variables (time and rate) and 10 observations
time <- seq(1:10)
rate <- 1-(0.99^time)
dat <- data.frame(time, rate)
I need to add a new column (called new_rat...
Posterity asked 23/7, 2020 at 0:54
2
Solved
The dataset named crass looks like -
> dput(crass)
structure(list(WT_TRADE_PRICE = c(3801, 3801, 3801, 3797, 3797,
3796.2125, 3800, 3797, 3795.09523809524, 3794, 3793, 3793, 3793.8,
3794.72, 3...
Upbuild asked 24/3, 2021 at 18:54
3
Solved
This is related to R: use the newly generated data in the previous row
I realized the actual problem I was faced with is a bit more complicated than the example I gave in the thread above - it seem...
Damal asked 19/4, 2021 at 1:33
3
Solved
I have a list whose elements are integers and I would like to accumulate these elements if only they share at least one value. With regard to those elements that don't share any values with the res...
Matthewmatthews asked 14/6, 2021 at 13:8
2
Solved
Say I have the following dataset dt and a constant constant.
dt <- structure(list(var1 = c(-92186.7470607738, -19163.5035325072,
-18178.8396858014, -9844.67882723287, -16494.7802822178, -17088...
Invention asked 26/5, 2021 at 14:28
2
Solved
I read the manual for using accumulate saying that it is a 2-argument function. I don't understand the given example:
1:5 %>% accumulate(`+`)
#> [1] 1 3 6 10 15
If accumulate is a 2-argument...
Ammonal asked 7/2, 2021 at 4:20
2
This program:
#include <ranges>
#include <numeric>
#include <iostream>
int main() {
auto rng = std::ranges::istream_view<int>(std::cin);
std::cout << std::accumulat...
Bignoniaceous asked 15/12, 2020 at 19:50
1
Solved
I'm learning Haskell and I found an interesting implementation of init using foldr. However, I have difficulty understanding how it works.
init' xs = foldr f (const []) xs id
where f x g h = h $ g...
Compilation asked 7/8, 2020 at 23:35
1
I'm trying to understand this code but I can't figure out why this version
for (; first != last; ++first)
init = std::move(init) + *first;
is faster than this
for (; first != last; ++first)
...
Chuch asked 16/6, 2020 at 10:21
1
Solved
std::accumulate and std::reduce does almost the same thing.
Summary of of std::reduce says it all:
similar to `std::accumulate`, except out of order
In many cases these functions should yield ...
Richella asked 22/1, 2020 at 9:1
2
Solved
In C++20, many (most?) C++-standard-library algorithms have been made constexpr. Yet - std::accumulate has not.
It seems like it could have been:
template<class InputIt, class T>
constexpr ...
Fertilization asked 19/9, 2019 at 7:36
2
Solved
If I like to accumulate the absolute values of a std::vector, I can use a lambda to calculate the absolute value and add it to the sum of std::accumulate (live demo).
#include <numeric>
#inc...
Heed asked 7/10, 2019 at 9:22
3
Solved
The output is 705032704 instead of 5000000000. Why is that? I thought std::accumulate would compute the sum of the elements in the vector.
#include <vector>
#include <algorithm>
#incl...
Karachi asked 6/8, 2019 at 11:43
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