A CSV data file with dates for the Jewish holidays of Rosh Hashanah and Yom Kippur from 1900 to 2020.
James Toll jtoll
jtoll
/ holidays.csv
Created
October 1, 2014 16:42
Dates for the Jewish holidays of Rosh Hashanah and Yom Kippur from 1900 to 2020.
jtoll
/ divisible.hs
Created
February 26, 2014 00:37
111 is divisible by 3. 111111111 is divisible by 9. For which N is the number composed of N 1s divisible by N?
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| -- https://twitter.com/jamestanton/status/438258919413387264 | |
| -- "111 is divisible by 3. 111111111 is divisible by 9. | |
| -- For which N is the number composed of N 1s divisible by N?" | |
| -- Version 1: very slow due to the construction of the numerator | |
| numerator1 x = sum $ map (\y -> 10^y) [0..(x-1)] | |
| test1 x = numerator1 x `rem` x == 0 | |
jtoll
/ cryptoTools.py
Last active
September 2, 2019 23:33
Simple functions for converting between string, hex, and int for a crypto course using Python
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| def str2hex (x): | |
| return x.encode('hex') | |
| def hex2str (x): | |
| return x.decode('hex') | |
| def str2int (x): | |
| return map(ord, x) |
jtoll
/ index.html
Last active
December 30, 2015 17:19
A simple example of a javascript function to swap thumbnail images on click
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Title | index.html</title> | |
| <script> | |
| function showImg(x) { |
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| # Example: Easily source a Gist from R using devtools | |
| # 1) install devtools | |
| if (!("devtools" %in% installed.packages()[, 1])) { | |
| install.packages("devtools") | |
| } | |
| # 2) source | |
| # library(devtools) | |
| # source_gist("https://gist.github.com/4041561") |
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| # "Machine epsilon gives an upper bound on the relative | |
| # error due to rounding in floating point arithmetic." | |
| # http://en.wikipedia.org/wiki/Machine_epsilon | |
| # ?.Machine | |
| .Machine$double.eps | |
| # [1] 2.220446e-16 | |
| # 2 ^ (-52) |
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| # Extract the hexadecimal color values for a particular palette from | |
| # the RColorBrewer package, as used by ggplot's scales package. | |
| library("RColorBrewer") | |
| brewer.pal(12, "Paired") | |
| # [1] "#A6CEE3" "#1F78B4" "#B2DF8A" "#33A02C" "#FB9A99" "#E31A1C" | |
| # [7] "#FDBF6F" "#FF7F00" "#CAB2D6" "#6A3D9A" "#FFFF99" "#B15928" |