magnetikonline

Bash string manipulation cheatsheet

Assignment
Assign value to variable if variable is not already set, value is returned. Combine with a : no-op to discard/ignore return value.	${variable="value"} : ${variable="value"}

karpathy

"""
Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
BSD License
"""
import numpy as np

# data I/O
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)

waylonflinn

#!/usr/bin/env bash

## create an ubuntu 14.04 hvm instance, then from your home directory:

# 1. download this script
# wget https://gist.githubusercontent.com/waylonflinn/506f563573600d944923/raw/install-python-data-science.sh

# 2. make it executable
# chmod a+x install-python-data-science.sh

bsweger

Useful Pandas Snippets

A personal diary of DataFrame munging over the years.

Data Types and Conversion

Convert Series datatype to numeric (will error if column has non-numeric values)
(h/t @makmanalp)

yihui

\documentclass{article}

\begin{document}

<<names>>=
input$firstname
input$lastname
@

\end{document}

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

kamipo

#!/usr/bin/env perl
use strict;
use warnings;
use Parallel::ForkManager;

my @all_data = qw/hoge fuga foo bar fizz buzz/;

my $pm = new Parallel::ForkManager(3);

for my $data (@all_data) {