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random-samplemath

This is a small library to select N random items from given sequence:

POFTHEDAY> (alexandria:iota 100)
(0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99)

POFTHEDAY> ;; Now we'll select 10 random numbers
POFTHEDAY> (random-sample:random-sample * 10)
(73 38 39 56 26 83 86 62 46 27)

;; It also works for vectors and strings:

POFTHEDAY> #(1 2 3 4 5 6 7 8 9)
#(1 2 3 4 5 6 7 8 9)
POFTHEDAY> (random-sample:random-sample * 4)
(8 2 7 1)
POFTHEDAY> 
; No values
POFTHEDAY> (random-sample:random-sample "Hello world!" 4)
(#\e #\o #\H #\ )

That is all that it does. But it has 20 dependencies! Why?

POFTHEDAY> (ql:quickload :random-sample)
To load "random-sample":
  Load 7 ASDF systems:
    alexandria asdf asdf-package-system closer-mop iterate
    named-readtables uiop
  Install 20 Quicklisp releases:
    bordeaux-threads fare-quasiquote fare-utils global-vars
    infix-math introspect-environment lisp-namespace optima
    parse-declarations parse-number random-sample serapeum
    split-sequence string-case trivia trivial-cltl2
    trivial-file-size trivial-garbage
    trivial-macroexpand-all type-i

By the way, did you know there is a system that helps to visualize dependencies between ASDF systems? Let's try it as a bonus to this short thread!

POFTHEDAY> (ql:quickload :asdf-viz)
  
POFTHEDAY> (setf cl-dot:*dot-path* "/usr/local/bin/dot")
"/usr/local/bin/dot"

POFTHEDAY> (asdf-viz:visualize-asdf-hierarchy
            "random-sample.png"
            (list (asdf:find-system :random-sample)))
NIL

Here are all dependencies of the :random-sample. Most of these, are sub dependencies of the :serapeum: