Stemplot

Stemplots in Julia

julia> stemplot(randn(100),scale = 1)

   -2 | 930
   -1 | 97733330
    0 | 998877776666666555544433333222221100000
    0 | 00001111222222233344444445566777788889
    1 | 0112234468
    2 | 46

  Description: The decimal is 0 digit(s) to the right of |

Installation

Pkg.clone("https://github.com/alexhallam/Stemplot.jl")

Getting Started

This package has the function stemplot which is used to generate simple stemplots in Julia.

Description

Draws a stem leaf plot of the given vector v.

Usage

stemplot(v)

function stemplot(v::AbstractVector;
                  scale=10,
                  divider::AbstractString="|",
                  padchar::AbstractString=" "
                  )

Arguments

-v : Vector for which the stem leaf plot should be computed

-scale: Set scale of plot. Default = 10. Scale is changed via orders of magnitude common values are ".1","1"."10".

-divider: Symbol for break between stem and leaf. Default = "|"

-padchar: Character(s) to separate stems, leaves and dividers. Default = " "

Examples

julia> stemplot(rand(1:100,80))

     0 | 20304050607070808090
     1 | 1030303060607080
     2 | 010103060709090
     3 | 0102030405060606080
     4 | 020406070
     5 | 102030405060608090
     6 | 105060607080
     7 | 050506070707080
     8 | 20404050607090
     9 | 10203030508080
    10 | 00

  Description: The decimal is 1 digit(s) to the right of |

julia> stemplot(rand(-100:100,300))


  -10 | 0
   -9 | 9090808070606050505040403020202000
   -8 | 8080605050404030300000
   -7 | 909090707070707060606050404040402010
   -6 | 90909080806050404040303020201000
   -5 | 9080807070605040303030202020201000
   -4 | 9080808080807070606050505040303020101010
   -3 | 909080707070706060605050403030202020100
   -2 | 808070707070504010
   -1 | 9080808070707060606040200
    0 | 90909080806050504040302010
    0 | 202040404050607080909090
    1 | 101030304040505050607080808090
    2 | 0101030304040506090
    3 | 30303040404040505060607070
    4 | 2030305050505080808090
    5 | 010101020203030303040405060607080
    6 | 0010103040404040505050606070707070808090
    7 | 405050606070809090
    8 | 202020304040505060707070808080
    9 | 010202030303040405060607070809090

  Description: The decimal is 1 digit(s) to the right of |

julia> stemplot(randn(50),scale = 1)
     -2 | 00000
     -1 | 0000000
      0 | 00000000000000
      0 | 0000000000000000
      1 | 00000000
    Key: 1|0 = 1.0
    Description: The decimal is 0 digit(s) to the right of |

Or Julia's fancy emoji "smile" you can get by typing \:smile + Tab

julia> stemplot(randn(50),scale = 1, divider = "😄")
-2 😄 0
-1 😄 0000000000
-0 😄 000000000000
 0 😄 000000000000000000000
 1 😄 000000

Key: 1😄0 = 1
The decimal is 0 digit(s) to the right of 😄

TODO

• Create type for stemplot so that it can be updated/refreshed with stemplot!()
• Add trim::Bool parameter - round down by base scale to reduce digits
• Create method for back-to-back stem plots which can be useful for comparing distributions:

julia> stemplot(dataset1, dataset2)
 99832 | 0 | 12339
   210 | 1 | 0012334
       | 2 | 89
  6600 | 3 | 00136