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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
# error messages are proper
Code
make_()
Condition
Error in `.extract_constructor_and_modifiers()`:
! Don't know how to make_, nothing given
Code
make_(1:10)
Condition
Error in `.extract_constructor_and_modifiers()`:
! Don't know how to make_, nothing given
Code
graph_()
Condition
Error in `.extract_constructor_and_modifiers()`:
! Don't know how to graph_, nothing given
Code
graph_(1:10)
Condition
Error in `.extract_constructor_and_modifiers()`:
! Don't know how to graph_, nothing given
Code
graph_(directed_graph(), directed_graph())
Condition
Error in `.extract_constructor_and_modifiers()`:
! Don't know how to graph_, multiple constructors given
Code
sample_()
Condition
Error in `.extract_constructor_and_modifiers()`:
! Don't know how to sample_, nothing given
Code
sample_(1:10)
Condition
Error in `.extract_constructor_and_modifiers()`:
! Don't know how to sample_, nothing given
Code
sample_(directed_graph(), directed_graph())
Condition
Error in `.extract_constructor_and_modifiers()`:
! Don't know how to sample_, multiple constructors given
# graph_from_literal() and simple undirected graphs
Code
graph_from_literal(A - B)
Output
IGRAPH UN-- 2 1 --
+ attr: name (v/c)
+ edge (vertex names):
[1] A--B
Code
graph_from_literal(A - B - C)
Output
IGRAPH UN-- 3 2 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A--B B--C
Code
graph_from_literal(A - B - C - A)
Output
IGRAPH UN-- 3 3 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A--B A--C B--C
# graph_from_literal() and undirected explosion
Code
graph_from_literal(A:B:C - D:E, B:D - C:E)
Output
IGRAPH UN-- 5 8 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A--D A--E B--C B--D B--E C--D C--E D--E
Code
graph_from_literal(A:B:C - D:E - F:G:H - I - J:K:L:M)
Output
IGRAPH UN-- 13 19 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A--D A--E B--D B--E C--D C--E D--F D--G D--H E--F E--G E--H F--I G--I H--I
[16] I--J I--K I--L I--M
# graph_from_literal() and simple directed graphs
Code
graph_from_literal(A - +B)
Output
IGRAPH DN-- 2 1 --
+ attr: name (v/c)
+ edge (vertex names):
[1] A->B
Code
graph_from_literal(A - +B - +C)
Output
IGRAPH DN-- 3 2 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A->B B->C
Code
graph_from_literal(A - +B - +C - +A)
Output
IGRAPH DN-- 3 3 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A->B B->C C->A
Code
graph_from_literal(A - +B + -C - +A)
Output
IGRAPH DN-- 3 3 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A->B C->A C->B
# graph_from_literal() and directed explosion
Code
graph_from_literal(A:B:C - +D:E, B:D + -C:E)
Output
IGRAPH DN-- 5 9 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A->D A->E B->D B->E C->B C->D C->E E->B E->D
Code
graph_from_literal(A:B:C - +D:E + -F:G:H - +I + -J:K:L:M)
Output
IGRAPH DN-- 13 19 --
+ attr: name (v/c)
+ edges (vertex names):
[1] A->D A->E B->D B->E C->D C->E F->D F->E F->I G->D G->E G->I H->D H->E H->I
[16] J->I K->I L->I M->I
# graph_from_literal(simplify = FALSE)
Code
graph_from_literal(1 - 1, 1 - 2, 1 - 2)
Output
IGRAPH UN-- 2 1 --
+ attr: name (v/c)
+ edge (vertex names):
[1] 1--2
Code
graph_from_literal(1 - 1, 1 - 2, 1 - 2, simplify = FALSE)
Output
IGRAPH UN-- 2 3 --
+ attr: name (v/c)
+ edges (vertex names):
[1] 1--1 1--2 1--2
# make_empty_graph gives an error for invalid arguments
Code
make_empty_graph(NULL)
Condition
Error in `make_empty_graph()`:
! `n` must be numeric, not NULL.
---
Code
make_empty_graph("spam")
Condition
Error in `make_empty_graph()`:
! `n` must be numeric, not a string.
---
Code
make_empty_graph(10, "spam")
Condition
Error in `make_empty_graph()`:
! `directed` must be a logical, not a string.
|
