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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
############################################################################
#
# File: datmerge.icn
#
# Subject: Program to merge data files
#
# Author: Gregg M. Townsend
#
# Date: November 16, 2001
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Datmerge reads and combines arbitrary text-based data files that
# contain whitespace-separated data. For each data field, a single
# value is written to standard output after applying a selected
# operator (such as median or minimum) to the corresponding values
# from all the input files.
#
# Usage: datmerge [-operator] filename...
#
# Operators:
# -min or -minimum
# -max or -maximum
# -med or -median (this is the default)
# -mean
#
# Values convertible to numeric are treated as such.
# All others are treated as strings.
#
############################################################################
#
# Links: numbers, strings
#
############################################################################
link numbers, strings
procedure main(args)
local a, opr, files, lines
if args[1][1] == '-' then {
a := get(args)
opr := case a of {
"-min" | "-minimum": minimum
"-max" | "-maximum": maximum
"-med" | "-median": median
"-mean": mean
default: stop(&progname, ": unrecognized operator: ", a)
}
}
else
opr := median
if *args < 1 then
stop("usage: ", &progname, " [-operator] filename...")
files := []
while a := get(args) do
put(files, open(a)) | stop("cannot open ", a)
repeat {
lines := []
every put(lines, read(!files))
if *lines = 0 then break
merge(lines, opr)
}
end
# merge(lines, opr) -- output the result of merging a list of lines.
procedure merge(lines, opr)
local a, s, w, fields, ws
fields := []
every s := !lines do {
put(fields, a := [])
every w := words(s) do
put(a, numeric(w) | w)
}
ws := ""
repeat {
a := []
every put(a, get(!fields))
if *a = 0 then break
writes(ws, opr(a))
ws := " "
}
write()
end
# Operator Procedures
#
# These procedures take a list and return a value.
# They must always return something regardless of the data.
# Those that involve arithmetic need to tolerate string data somehow.
procedure minimum(a)
a := sort(a)
return a[1]
end
procedure maximum(a)
a := sort(a)
return a[-1]
end
procedure mean(a)
return (amean ! nsubset(a)) | median(a)
end
procedure median(a)
a := sort(a)
return a[(*a + 1) / 2]
end
# nsubset(a) -- return subset of array a that contains numeric values
procedure nsubset(a)
local b
b := []
every put(b, numeric(!a))
if *b > 0 then
return b
else
fail
end
|
