beibeiJ

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

beibeiJ

#!/bin/bash
# Sometimes you need to move your existing git repository
# to a new remote repository (/new remote origin).
# Here are a simple and quick steps that does exactly this.
#
# Let's assume we call "old repo" the repository you wish
# to move, and "new repo" the one you wish to move to.
#
### Step 1. Make sure you have a local copy of all "old repo"
### branches and tags.

beibeiJ

#' Create a quantile-quantile plot with ggplot2.
#'
#' Assumptions:
#'   - Expected P values are uniformly distributed.
#'   - Confidence intervals assume independence between tests.
#'     We expect deviations past the confidence intervals if the tests are
#'     not independent.
#'     For example, in a genome-wide association study, the genotype at any
#'     position is correlated to nearby positions. Tests of nearby genotypes
#'     will result in similar test statistics.