Extract rows from R data frame based on factors (strings)
Try using the subset function. This site provides a good reference: HowtoInR
data structures
Difference between binary tree and binary search tree
Binary tree: Tree where each node has up to two leaves Binary search tree: Used for searching. A binary tree where the left child contains only nodes with values less than the parent node, and where the right child only contains nodes with values greater than or equal to the parent.
Is there an easy way to make a min heap in C++?
I’m very new to C++, and I was wondering if there was a way to make a min heap in C++ from the standard library.
JavaScript hashmap equivalent
Hash your objects yourself manually, and use the resulting strings as keys for a regular JavaScript dictionary. After all, you are in the best position to know what makes your objects unique. That’s what I do. Example: This way you can control indexing done by JavaScript without heavy lifting of memory allocation, and overflow handling. … Read more
How can I implement a tree in Python?
I am trying to construct a General tree. Are there any built-in data structures in Python to implement it?