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Referencing a column in a function in R

I am experimenting with writing functions and I was wondering how you apply a function to columns individually. For example, with the mtcars dataset, I would li

How can I apply style to DOM elements added by Gatsby?

Gatsby adds elements to the DOM. These include: #___gatsby #gatsby-focus-wrapper Because these styles are not user-created, component-scoped styles can't be app

Asp.net System.NullReferenceException when creating new MysqlConnection

`I'm new to asp.net and when I tried to connect to MySQL database I got this error. error message here is my code in web.config file <configuration> &

copy data from one structure to another in C

If I have a structure defined like: struct image{ unsigned int width, height; unsigned char *data; }; And 2 variables of this type: struct image image1; str

Check if the position is a valid cell in a maze

I am trying to make a maze. The walls consist of '#' and I want to make a path from top left to bottom right using '.'. I have come this far, However when I ru

android studio call a functoin with alarm manager