Stem-and-leaf plot: Difference between revisions
→{{header|Python}}: Added a more general (and declarative) variant, written in terms of groupby and reduce
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14 | 1 6
</pre>
Or, generalising a little to write a purely declarative function (in terms of '''groupby''' and '''reduce''') which takes stem and leaf accessor functions as its first arguments:
<lang python>from itertools import (groupby)
from functools import (reduce)
# stemLeaf :: (String -> Int) -> (String -> String) -> String -> String
def stemLeaf(f, g, s):
return '\n'.join(map(
lambda x: str(x[0]).ljust(2) + ' | ' +
reduce(lambda a, tpl: a + tpl[1] + ' ', x[1], ''),
(groupby(sorted(
map(lambda x: (f(x), g(x)), s.split())
),
lambda x: x[0]
))
))
# main :: IO()
def main():
def stem(s):
return (lambda x=s[:-1]: int(x) if 0 < len(x) else 0)()
def leaf(s):
return s[-1]
s = ('12 127 28 42 39 113 42 18 44 118 44 37 113 124 37 48 127 36 29 31'
' 125 139 131 115 105 132 104 123 35 113 122 42 117 119 58 109 23'
' 105 63 27 44 105 99 41 128 121 116 125 32 61 37 127 29 113 121 58'
' 114 126 53 114 96 25 109 7 31 141 46 13 27 43 117 116 27 7 68 40'
' 31 115 124 42 128 52 71 118 117 38 27 106 33 117 116 111 40 119 47'
' 105 57 122 109 124 115 43 120 43 27 27 18 28 48 125 107 114 34 133'
' 45 120 30 127 31 116 146')
print (stemLeaf(stem, leaf, s))
main()</lang>
<pre>0 | 7 7
1 | 2 3 8 8
2 | 3 5 7 7 7 7 7 7 8 8 9 9
3 | 0 1 1 1 1 2 3 4 5 6 7 7 7 8 9
4 | 0 0 1 2 2 2 2 3 3 3 4 4 4 5 6 7 8 8
5 | 2 3 7 8 8
6 | 1 3 8
7 | 1
9 | 6 9
10 | 4 5 5 5 5 6 7 9 9 9
11 | 1 3 3 3 3 4 4 4 5 5 5 6 6 6 6 7 7 7 7 8 8 9 9
12 | 0 0 1 1 2 2 3 4 4 4 5 5 5 6 7 7 7 7 8 8
13 | 1 2 3 9
14 | 1 6 </pre>
=={{header|R}}==
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