我正在嘗試從其他資料創建一個資料框，我當前的資料包括 20 個國家，從 2020 年到 2030 年的 10 年。我現在希望創建一個新的 df ，其中包含每個國家和每年分別看起來像這樣；
所需的df：
Albania 2021
Albania 2022
...... continued to 2030, then
Algeria 2021
Algeria 2022 and so on
為此所需的資料：
CountryNames
"Albania", "Algeria", "Bosnia and Herzegovina" "Croatia", "Cyprus", "Egypt, Arab Rep.", "France", "Greece", "Israel", "Italy", "Lebanon", "Libya", "Malta", "Montenegro", "Morocco", "Slovenia", "Spain", "Syrian Arab. Rep", "Tunisia", "Turkey"
future_years
2021, 2022, 2023, 2024, 2025, 2025, 2026, 2027, 2028, 2029, 2030
uj5u.com熱心網友回復：
我想你只是想要expand.grid：
all_df <- expand.grid(future_years = c(2021, 2022, 2023, 2024, 2025, 2025, 2026, 2027, 2028, 2029, 2030),
CountryNames = c("Albania", "Algeria", "Bosnia and Herzegovina",
"Croatia", "Cyprus", "Egypt, Arab Rep.", "France", "Greece",
"Israel", "Italy", "Lebanon", "Libya", "Malta", "Montenegro",
"Morocco", "Slovenia", "Spain", "Syrian Arab. Rep", "Tunisia",
"Turkey"))[,c("CountryNames", "future_years")]
head(all_df, 10)
#> CountryNames future_years
#> 1 Albania 2021
#> 2 Albania 2022
#> 3 Albania 2023
#> 4 Albania 2024
#> 5 Albania 2025
#> 6 Albania 2025
#> 7 Albania 2026
#> 8 Albania 2027
#> 9 Albania 2028
#> 10 Albania 2029
由reprex 包（v2.0.1）于 2022 年 11 月 13 日創建
uj5u.com熱心網友回復：
使用complete來自tidyr：
使用您給定的 2 個向量：
CountryNames <- c("Albania", "Algeria", "Bosnia and Herzegovina","Croatia", "Cyprus", "Egypt, Arab Rep.", "France", "Greece", "Israel", "Italy", "Lebanon", "Libya", "Malta", "Montenegro", "Morocco", "Slovenia", "Spain", "Syrian Arab. Rep", "Tunisia", "Turkey")
future_years <- c(2021, 2022, 2023, 2024, 2025, 2025, 2026, 2027, 2028, 2029, 2030)
我們可以使用complete：
library(tidyr)
df %>%
complete(CountryNames, future_years = 2021:2030) %>%
as.data.frame()
CountryNames future_years
1 Albania 2021
2 Albania 2022
3 Albania 2023
4 Albania 2024
5 Albania 2025
6 Albania 2026
7 Albania 2027
8 Albania 2028
9 Albania 2029
10 Albania 2030
11 Algeria 2021
12 Algeria 2022
13 Algeria 2023
14 Algeria 2024
15 Algeria 2025
16 Algeria 2026
17 Algeria 2027
18 Algeria 2028
19 Algeria 2029
20 Algeria 2030
21 Bosnia and Herzegovina 2021
22 Bosnia and Herzegovina 2022
23 Bosnia and Herzegovina 2023
24 Bosnia and Herzegovina 2024
25 Bosnia and Herzegovina 2025
26 Bosnia and Herzegovina 2026
27 Bosnia and Herzegovina 2027
28 Bosnia and Herzegovina 2028
29 Bosnia and Herzegovina 2029
30 Bosnia and Herzegovina 2030
31 Croatia 2021
32 Croatia 2022
33 Croatia 2023
34 Croatia 2024
35 Croatia 2025
36 Croatia 2026
37 Croatia 2027
38 Croatia 2028
39 Croatia 2029
40 Croatia 2030
41 Cyprus 2021
42 Cyprus 2022
43 Cyprus 2023
44 Cyprus 2024
45 Cyprus 2025
46 Cyprus 2026
47 Cyprus 2027
48 Cyprus 2028
49 Cyprus 2029
50 Cyprus 2030
51 Egypt, Arab Rep. 2021
52 Egypt, Arab Rep. 2022
53 Egypt, Arab Rep. 2023
54 Egypt, Arab Rep. 2024
55 Egypt, Arab Rep. 2025
56 Egypt, Arab Rep. 2026
57 Egypt, Arab Rep. 2027
58 Egypt, Arab Rep. 2028
59 Egypt, Arab Rep. 2029
60 Egypt, Arab Rep. 2030
61 France 2021
62 France 2022
63 France 2023
64 France 2024
65 France 2025
66 France 2026
67 France 2027
68 France 2028
69 France 2029
70 France 2030
71 Greece 2021
72 Greece 2022
73 Greece 2023
74 Greece 2024
75 Greece 2025
76 Greece 2026
77 Greece 2027
78 Greece 2028
79 Greece 2029
80 Greece 2030
81 Israel 2021
82 Israel 2022
83 Israel 2023
84 Israel 2024
85 Israel 2025
86 Israel 2026
87 Israel 2027
88 Israel 2028
89 Israel 2029
90 Israel 2030
91 Italy 2021
92 Italy 2022
93 Italy 2023
94 Italy 2024
95 Italy 2025
96 Italy 2026
97 Italy 2027
98 Italy 2028
99 Italy 2029
100 Italy 2030
101 Lebanon 2021
102 Lebanon 2022
103 Lebanon 2023
104 Lebanon 2024
105 Lebanon 2025
106 Lebanon 2026
107 Lebanon 2027
108 Lebanon 2028
109 Lebanon 2029
110 Lebanon 2030
111 Libya 2021
112 Libya 2022
113 Libya 2023
114 Libya 2024
115 Libya 2025
116 Libya 2026
117 Libya 2027
118 Libya 2028
119 Libya 2029
120 Libya 2030
121 Malta 2021
122 Malta 2022
123 Malta 2023
124 Malta 2024
125 Malta 2025
126 Malta 2026
127 Malta 2027
128 Malta 2028
129 Malta 2029
130 Malta 2030
131 Montenegro 2021
132 Montenegro 2022
133 Montenegro 2023
134 Montenegro 2024
135 Montenegro 2025
136 Montenegro 2026
137 Montenegro 2027
138 Montenegro 2028
139 Montenegro 2029
140 Montenegro 2030
141 Morocco 2021
142 Morocco 2022
143 Morocco 2023
144 Morocco 2024
145 Morocco 2025
146 Morocco 2026
147 Morocco 2027
148 Morocco 2028
149 Morocco 2029
150 Morocco 2030
151 Slovenia 2021
152 Slovenia 2022
153 Slovenia 2023
154 Slovenia 2024
155 Slovenia 2025
156 Slovenia 2026
157 Slovenia 2027
158 Slovenia 2028
159 Slovenia 2029
160 Slovenia 2030
161 Spain 2021
162 Spain 2022
163 Spain 2023
164 Spain 2024
165 Spain 2025
166 Spain 2026
167 Spain 2027
168 Spain 2028
169 Spain 2029
170 Spain 2030
171 Syrian Arab. Rep 2021
172 Syrian Arab. Rep 2022
173 Syrian Arab. Rep 2023
174 Syrian Arab. Rep 2024
175 Syrian Arab. Rep 2025
176 Syrian Arab. Rep 2026
177 Syrian Arab. Rep 2027
178 Syrian Arab. Rep 2028
179 Syrian Arab. Rep 2029
180 Syrian Arab. Rep 2030
181 Tunisia 2021
182 Tunisia 2022
183 Tunisia 2023
184 Tunisia 2024
185 Tunisia 2025
186 Tunisia 2026
187 Tunisia 2027
188 Tunisia 2028
189 Tunisia 2029
190 Tunisia 2030
191 Turkey 2021
192 Turkey 2022
193 Turkey 2023
194 Turkey 2024
195 Turkey 2025
196 Turkey 2026
197 Turkey 2027
198 Turkey 2028
199 Turkey 2029
200 Turkey 2030
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