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Problem with creating and accesing a 4D vector in c++


By : Seppycool
Date : September 16 2020, 09:00 AM
To fix this issue If glob.size() is u, then valid indices range from 0 to u-1. You should be able to fix this by replacing >= with > in all your checks in the if statement.
code :


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Problem creating vector of Pairs


By : user3407956
Date : March 29 2020, 07:55 AM
I hope this helps . set::insert doesn't return the set itself. You need to create the set beforehand, insert and then use it in make_pair. This does the trick with nearly no overhead for the copy using move:
code :
std::vector< std::pair<int,std::set<int> > > DisjointSet;
for(auto i=0;i<10;++i) {
  std::set<int> tmp; tmp.insert(i);
  DisjointSet.push_back( std::make_pair(i,std::move(tmp)));
}

Accesing an element in vector of pair of integer and vector


By : M.millani
Date : March 29 2020, 07:55 AM
may help you . In the following code, I receive segfault at the last line:
code :
for (int j = 0; j < InputVector[i].second.size(); i++) 
                                                  ^^ should be j++

Problem with creating a lot of new vector's


By : Electric Sheep
Date : March 29 2020, 07:55 AM
will be helpful for those in need This is a matter of assigning the result of replicate to a variable (of class "list", since simplify = FALSE) and then sapply the mean and sd functions.
code :
set.seed(1234)    # Make the results reproducible

repl <- replicate(100, rnorm(50, 10, 20), simplify = FALSE) 

mu <- sapply(repl, mean)
s <- sapply(repl, sd)
D <- abs(s - mu)

head(D)
#[1] 16.761930  7.953432  6.833691 12.491605  5.490149  6.850794
D2 <- sapply(repl, function(x) abs(sd(x) - mean(x)))
identical(D, D2)
#[1] TRUE

I have a problem creating a vector of blocking queues in C++


By : federico perticari
Date : March 29 2020, 07:55 AM
this will help If you simply need to create a vector of nw elements you can do the following:
code :
std::vector<blocking_queue<int>> myVector(nw);

Accesing object stored in vector: use std::vector::at or std::vector::operator[]?


By : Akash chandra
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The main difference is that operator[] is unchecked, and will result in Undefined Behaviour if you try access memory out of bounds of the vector, whereas .at does checks on the index and will throw std::out_of_range exception if you try access memory out of bounds
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