vector Questions
26
Solved
I have a vector<int> container that has integers (e.g. {1,2,3,4}) and I would like to convert to a string of the form
"1,2,3,4"
What is the cleanest way to do that in C++?
In Python this ...
3
Solved
Let's say I have two 4-dimensional vectors (i.e. a and b) as follows:
a = {a1, a2, a3, a4}
b= {b1, b2, b3, b4}
How do I compute the Euclidean distance between these vectors?
Ahwaz asked 29/4, 2014 at 1:30
3
Solved
Say I have a camera placed at:
{
x: 10,
y: 30,
z: 20
}
It's rotation is:
{
x: 0.1,
y: 0.2,
z: 0.3
}
I want to move the camera 1 unit from it's current position in the direction it's fac...
Jidda asked 27/6, 2016 at 11:20
2
Solved
Say I have a set of vectors of different lengths.
I want to grab always the first 9 elements from them.
However, if the vector length is <9, I want to grab all the elements, and complete up to 9...
11
Solved
I have the following vectors with 0s and 1s:
test1 <- c(rep(0,20),rep(1,5),rep(0,10),rep(1,15))
test1
[1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 ...
Liddie asked 29/6, 2023 at 14:46
4
Solved
I am running 64 bit R 3.1 in a 64bit Ubuntu environment with 400GB of RAM, and I am encountering a strange limitation when dealing with large matrices.
I have a numeric matrix called A, that is 4...
4
Solved
I can't get the type of an element. This solution returns a reference to element type.
int arr[] = { 0, 1, 2, 3, 4, 5 };
using arrElemType = decltype(*arr);
vector<arrElemType> vec(std::cbeg...
5
Solved
vector<vector<int>> res;
res.emplace_back({1,2}); // change to res.push_back({1,2}); would work
This gives me the error:
main.cpp:61:25: error: no matching function for call to ‘std::v...
11
Solved
I tried norm, but I think it gives the wrong result. (the norm of c(1, 2, 3) is sqrt(1*1+2*2+3*3), but it returns 6..
x1 <- 1:3
norm(x1)
# Error in norm(x1) : 'A' must be a numeric matrix
norm(...
Raguelragweed asked 7/6, 2012 at 14:34
2
I have vectors stored in BigQuery (see How can I compute TF/IDF with SQL (BigQuery)), and I want to find the most similar between them. How can I compute the cosine similarity with BigQuery standar...
Talya asked 4/12, 2017 at 5:34
9
Solved
With the new android support update, vector drawables get backward compatibility. I have a vector image with various paths. I want the color of the paths to change on click of a button or programma...
Joellyn asked 25/2, 2016 at 10:48
7
Solved
I have a (fairly long) list of vectors. The vectors consist of Russian words that I got by using the strsplit() function on sentences.
The following is what head() returns:
[[1]]
[1] "модно" "со...
6
Solved
What is a recommended way to overload the output stream operator? The following can not be done. It is expected that compilation will fail if the operator << is not defined for a type T.
tem...
Rianon asked 2/11, 2010 at 12:28
3
Solved
I have a vector say
a = c(1,2,3,4,5,6)
I would like to organize them into the elements into an upper triangle matrix (without considering diagonal elements, they are all zero) by row. My goal i...
3
Im trying to apply a force to an object. To get it to move in the angle that my mouseposition is generating relative to the object.
I have the angle
targetAngle = Matter.Vector.angle(myBody.pos,...
Mutualism asked 6/3, 2016 at 12:49
2
Solved
Does std::vec::shrink_to_fit allocate a new, smaller vec.len() buffer of data, copy to it, and destruct the old buffer, or does it somehow indicate to the memory allocator that the uninitialised pa...
Hagler asked 22/5, 2023 at 17:0
7
Solved
I have a matrix with 5 columns and 4 rows. I also have a vector with 3 columns. I want to subtract the values in the vector from columns 3,4 and 5 respectively at each row of the matrix.
b <- m...
4
Solved
I'm trying to understand how up vectors and lookAt() work together in three.js. I'm setting the up vector of this axisHelper, so that the Y axis always points at the target geo, which marks the pos...
Chrissa asked 10/12, 2013 at 22:12
2
Solved
I was just messing around and learning about vectors as well as structs, and at one point, I tried outputting the size of a vector in bytes. Here's the code:
#include <iostream>
#include <...
2
Solved
I got this error ,,"vector" was not declared in this scope'' for the following code when I separate in *h and *cpp a file
This is the main.cpp:
#include <iostream>
#include <math.h>
#i...
6
Solved
I have found that the easiest way to build my program argument list is as a vector of strings. However, execv expects an array of chars for the second argument. What's the easiest way to get it to ...
2
Solved
I want to swap elements of slice data using library function, but it doesn't work because of multiple borrowing:
use std::mem;
fn example() {
let mut data = [1, 2, 3];
let i = 0;
let j = 1;
...
5
I have a vector of numbers
x <- c(2,5,1,6)
and I am trying to generate a sequence of values -- starting from 1 -- between and including the values in x so that I am left with the following s...
22
Solved
In our C++ course they suggest not to use C++ arrays on new projects anymore. As far as I know Stroustrup himself suggests not to use arrays. But are there significant performance differences?
7
Solved
I want to clear a element from a vector using the erase method. But the problem here is that the element is not guaranteed to occur only once in the vector. It may be present multiple times and I n...
© 2022 - 2024 — McMap. All rights reserved.