Say I have this data.frame The columns are mutually exclusive. I need to generate the output I've tried to to it with data.table fifelse but it ...

How to use data.table fifelse with vectors in the arguments?

Say I have this data.frame The columns are mutually exclusive. I need to generate the output I've tried to to it with data.table fifelse but it ...

How to add dash function with vectors

In my 2D (top-down) game, I am attempting to add a dash function. Using an if (keyWentDown("e")) {} condition inside a function named dash. I have a ...

Create random points over a line spatvector in R

I have a spatVector composed of a single-line geometry that covers the entire road network of my study area. I would like to create a set of N random ...

write two matlab vectors in a file and insert backslash between the vectors

Given Is there a way to achieve this in one single fprintf() call? I have a solution where there is no backslash between a and b ...

How do I return specific vector elements in c++ elegantly

I am working on a problem in which I must return a type vector. I know the size of the vector will be exactly two. Is there a way I can return my valu ...

How can I concatenate the elements of a vector of integers to a string in C++?

I've been trying to put every single element of a vector of integers into a string. I want to achieve this by type casting the integers into strings, ...

How can I delete an element in vector if erase function isn't working?

I'm trying to write a function that represents a two-dimensional vector, each element of vector has two information. I wanted to write a method that s ...

Nested for loop in rust, modifying elements in a vector

I am trying to create a nested loop in rust, that goes through a vector. Essentially, it looks like this: However, this will not work; Rust cannot ...

rust vector iterator in multi-layer loop

I try to use iterator on vector slices, but it just doesn't work. My code are as follows pub fn three_sum(nums: Vec<i32>) -> Vec<Vec&l ...

How can I plot in horizontal lines along X axis corresponding to a value on the y axis?

I have 2 arrays Q and Z. I want to plot Q on the y-axis and Z on the x-axis. The elements of Z are 0s and 1s. What I want is to draw a horizontal lin ...

Storing every number that bigger than 600 to store another vector but is not printing numbers

I tried if vec2 > 600 save it to va ...

Find length of array of functions in Julia

I want to find the length, nc, of this "vector of functions". I should be 2. I tried with length(comp) and length(comp(x)) but it doesn't work. I g ...

can Gekko solve vector based dynamic optimization problem for optimal control

i have tried many solver but getting errors somewhere. now im going to try gekko for my problem. Please Lt me know that gekko can this kind of problem ...

Clojure assoc/assoc-in

hello everyone, I making practice on assoc functions so I wanted to create a sample database just using assoc functions to do the practice. I check ...

Create logical vector of first matching condition

How can one create a logical vector that has TRUE for the first matching condition and FALSE otherwise? v = rep(1:4, 3) v == 3 #[1] FALSE FALSE TRUE ...

Finding the magnitude of a 3X1 complex vector in Python?

I was wondering if someone would help me with this problem. I have complex 3x1 matrix that looks like, As I am not interested in the last element I ...

Assigning all the values of a vector to another vector with pointers

So I am trying to make a copy of a vector that would be immediate instead of copying one by one the values of a vector to the other vector. The code ...

why is my rudimentary implementation of Vector faster than the stl version for push_back?

I have implemented a rudimentary vector using the code from the Weiss C++ textbook on data structures (see below). when i time it with 100,000 push_ba ...

How to modify this function for argument usage

i have this function with constructor: Which is called like this: How do I modify this function so it will let me pass my variables like this: t ...

Apply function to vector of values instead of single value in R

I wrote a function to calculate PAFPM2.5 This function works fine. However, there is a fatal error in my last step where I try to apply the function ...

Sorted:

Quality: