vector Questions
3
I have a strange problem, maybe I'm missing something obvious but I can't fiugre out.
Here is the C++ code that throws the assert:
int compareByX(const Vector2D &a, const Vector2D &b)
{
...
7
I was wondering if there was a quick way to find out if all elements in a vector are false or true? Like instead of checking each element using a loop?
3
Solved
Is there a way to add values to the middle of a vector in C++? Say I have:
vector <string> a;
// a gets filled up with "abcd", "wertyu", "dvcea", "eafdefef", "aeefr", etc
and I want to bre...
2
Solved
I am somewhat new to Stack Overflow and C++ so feel free to correct any errors in my code and the formatting of this question.
I am trying to make a linear regression calculator using the normal e...
2
I have written a simple program to test "vector.erase" feature. There is a simple class (MyClass0) which writes some related message in it's constructor and another in it's destructor. An...
Genus asked 17/11, 2022 at 13:16
5
I have data as follows:
avec <- c("somevar", NA ,"anothervar", NA, "thisvar","thatvar", NA, "lastvar", NA )
All I want to do is to replace all ...
3
Solved
In JavaScript, there is an operator called the spread operator that allows you to combine arrays very concisely.
let x = [3, 4];
let y = [5, ...x]; // y is [5, 3, 4]
Is there a way to do somethi...
3
In my program there is some frequently used data type with trivial fields
struct Element {
Element() noexcept : x( 0 ), y( 0 ), z( 0 ) {}
float x, y, z;
};
and also there are many pieces of code...
Taegu asked 21/10, 2022 at 19:31
6
Solved
It seems that every time I add an object to the vector m_test, the destructor method is called. Am I missing something? How can I prevent this from happening?
class TEST
{
public:
TEST();
~TEST(...
3
Solved
I have a vector of vectors of strings. I want to find the lengths of the longest string in each column. All the subvectors are of the same length and have an element stored in it, so it would be ra...
22
I have to split a vector into n chunks of equal size in R. I couldn't find any base function to do that. Also Google didn't get me anywhere. Here is what I came up with so far;
x <- 1:10
n <-...
5
Solved
I need to split a sorted unknown length vector in R into "top 10%,..., bottom 10%"
So, for example if I have vector <- order(c(1:98928)), I want to split it into 10 different vectors, each one r...
4
Solved
I'm very new to Rust, coming from C# / Java / similar.
In C# we have IEnumerable<T> that can be used to iterate almost any kind of array or list. C# also has a yield keyword that you can use...
10
What I need is a signed angle of rotation between two vectors Va and Vb lying within the same 3D plane and having the same origin knowing that:
The plane contatining both vectors is an arbitrary ...
5
Solved
I have made a vector which looks like this:
v1 <- c("1 1","1 2","1 3",
"2 1","2 2","2 3",
"3 1","3 2","3 3&...
Alanson asked 19/10, 2022 at 13:16
7
Solved
I have two vectors:
set.seed(1)
a <- sample(1:100,200, replace=T)
b <- sample(1:100,40, replace=F)
I want to find the the positions of elements in a that match b:
sapply(b, function(x) whi...
Herophilus asked 17/10, 2022 at 12:28
14
Solved
I have downloaded pretrained glove vector file from the internet. It is a .txt file. I am unable to load and access it. It is easy to load and access a word vector binary file using gensim but I do...
Dissolute asked 13/6, 2016 at 15:1
2
Solved
So basically I'm looking for a way to calculate the x, y and z component of a vector using 2 angles as shown:
Where alpha is the 2D angle and beta is the y angle.
What I've been using uptill now f...
3
Solved
I quickly checked numPy but it looks like it's using arrays as vectors? I am looking for a proper Vector3 type that I can instance and work on.
9
I have a vector and want to store int data in to it at run time can I store the data in a 2D vector in this manner ?
std::vector<std::vector <int>> normal:
for(i=0;i<10;i++){
for(...
Pregnable asked 15/2, 2017 at 12:22
10
Solved
I am novice in OpenCV. Recently, I have troubles finding OpenCV functions to convert from Mat to Array. I researched with .ptr and .at methods available in OpenCV APIs, but I could not get proper d...
7
I'm using a std::map, and I can't seem to free the memory back to the OS. It looks like,
int main(){
aMap m;
while(keepGoing){
while(fillUpMap){
//populate m
}
doWhatIwantWithMap(m);
m.cle...
Hakenkreuz asked 13/4, 2010 at 11:17
3
Solved
I am solving a problem on LeetCode, but nobody has yet been able to explain my issue.
The problem is as such:
Given an arbitrary ransom note string and another string containing letters from all th...
Haemo asked 1/4, 2019 at 9:24
5
Solved
Suppose I have a vector v and it has three elements: {1,2,3}.
Is there a way to specifically pop 2 from the vector so the resulting vector becomes {1,3}.
2
Solved
How can i get the x, y and z rotation values between two unit vectors? I can't use the dot product, because that gives me only one value. I want to use rotation matrices for rotating on each axis,a...
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