DeveloperLoad - DeveloperLoad

pivot_wider introduces NA values when reshaping from long to wide format [duplicate]

I am encountering a problem when I reshape my data using pivot_wider(). My data looks like this: df <- data.frame(area = c( "Area1","Area1"

Create a boxplot with several dataframes of different lengths in r

I'm very new to R and i'm trying to create a boxplot with using 12 different data frames. They all have one column (thermal comfort values) with different lengh

Is it dangerous/bad to call pthread_mutex_destroy with an uninitialized mutex

Example code: #include <pthread.h> int main(void) { pthread_mutex_t mutex; pthread_mutex_destroy(&mutex); return (0); } Is this a probl

SQL: Query adjacent nodes in a directed graph

I have a graph with nodes {A, B, C, D, ...} and a table which specifies the directed edges between them. | node_1 | node_2 | |-----------------| | A | B

.Net Core - How to check if the uploaded IFormFile is really an Image not relying on extension/mime type

When I upload a file from my React application to my server .NET Core api, I'm expecting a IFormFile type which should be an image. I'm validating the extension

Issue installing cryptography on Raspberry Pi 2B (armv7h Arch Linux ARM) (python 3.9.8)

I'm having some trouble installing the python cryptography package on my raspberry pi, specifically with python version 3.9.8 (installed with pyenv). The crypto

How can i pile balls in a box starting from the bottom?

I'm trying to do like a stack of balls inside a box (div/container) but when I try the balls start to stack from the top, and I want the same thing but starting