Johnathan questions

• Python: estimate Pi with trig functions as efficiently as possible
• Why can't I call system functions in R that clearly work in my terminal?
• How can increase the calendar size in Access?
• how to add function in class but not in header file in C++?
• Jupyter: install new modules
• Understand the `Reduce` function
• Extract the maximum value within each group in a dataframe [duplicate]

Johnathan answers