mkim0710

How to Ask for Help using R
========================================================

The key to getting good help with an R problem is to provide a minimally working 
reproducible example (MWRE). Making an MWRE is really easy with R, and it will 
help ensure that those helping you can identify the source of the error, and 
ideally submit to you back the corrected code to fix the error instead of sending
you hunting for code that works. To have an MWRE you need the following items:

- a minimal dataset that produces the error

mkim0710

# see blog post here:
# http://gettinggeneticsdone.blogspot.com/2015/01/microbenchmark-package-r-compare-runtime-r-expressions.html

library(dplyr)
library(nycflights13)
flights

# base
aggregate(flights$arr_delay, by=list(flights$carrier), mean, na.rm=TRUE)

mkim0710

_contracts = {}


class Contract:
    @classmethod
    def __init_subclass__(cls):
        _contracts[cls.__name__] = cls

    def __set__(self, instance, value):
        self.check(value)

mkim0710

solve <- function(n) {
  result <- largeSubtract(largeAdd(sumMultiple(n, 3), sumMultiple(n, 5)), sumMultiple(n, 15))
}

right <- function (string, char){
  substr(string,nchar(string)-(char-1),nchar(string))
}

left <- function (string,char){
  substr(string,1,char)