Ben

Ben has asked 132 questions and find answers to 42 problems.

Stats

About

Founder of Practice Probs - a platform for learning programming via fun challenge problems.

Ben questions

Rolling join + sum without blowing up memory
R - get the column index of a matrix based on a function for each row
How to deal with perfect fit linear model
Trouble scraping table from Wikipedia
What exactly does future=True do in sqlalchemy's create_engine() function?
gganimate not showing all frames
Error exposing c++ class method with reference parameter using Rcpp modules
RunTimeWarning: Invalid value encountered in greater [duplicate]
Why does gbm() give different results than h2o.gbm() in this minimal example?
Efficient way to apply function to each row of data frame and return list of data frames

Ben answers

Rolling join + sum without blowing up memory
How to lag values by number of days in a data table
Finding sequences in rows in R based on the rep function on a certain column
R: how to obtain unique pairwise combinations of 2 vectors [duplicate]
How to fill values of a (2,3,4) array using a (2,3) array of indices and a (2,3) array of new values
How to use custom cross validation folds with XGBoost
How to run a "hello world" python script with Google Cloud Run
CORS error with 2nd gen Cloud Functions for Firebase
How can i plot binary tree with 13 nodes in R Studio
Check if a value in one table (X) is between the values in two columns in another table (Y) with R data.table