mutate: Mutate a data frame by adding new or replacing existing...

Description Usage Arguments Details See Also Examples

View source: R/mutate.r

Description

This function is very similar to transform but it executes the transformations iteratively so that later transformations can use the columns created by earlier transformations. Like transform, unnamed components are silently dropped.

Usage

1
mutate(.data, ...)

Arguments

.data

the data frame to transform

...

named parameters giving definitions of new columns.

Details

Mutate seems to be considerably faster than transform for large data frames.

See Also

subset, summarise, arrange. For another somewhat different approach to solving the same problem, see within.

Examples

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 5
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 7
 8
 9
10
# Examples from transform
mutate(airquality, Ozone = -Ozone)
mutate(airquality, new = -Ozone, Temp = (Temp - 32) / 1.8)

# Things transform can't do
mutate(airquality, Temp = (Temp - 32) / 1.8, OzT = Ozone / Temp)

# mutate is rather faster than transform
system.time(transform(baseball, avg_ab = ab / g))
system.time(mutate(baseball, avg_ab = ab / g))

Example output

    Ozone Solar.R Wind Temp Month Day
1     -41     190  7.4   67     5   1
2     -36     118  8.0   72     5   2
3     -12     149 12.6   74     5   3
4     -18     313 11.5   62     5   4
5      NA      NA 14.3   56     5   5
6     -28      NA 14.9   66     5   6
7     -23     299  8.6   65     5   7
8     -19      99 13.8   59     5   8
9      -8      19 20.1   61     5   9
10     NA     194  8.6   69     5  10
11     -7      NA  6.9   74     5  11
12    -16     256  9.7   69     5  12
13    -11     290  9.2   66     5  13
14    -14     274 10.9   68     5  14
15    -18      65 13.2   58     5  15
16    -14     334 11.5   64     5  16
17    -34     307 12.0   66     5  17
18     -6      78 18.4   57     5  18
19    -30     322 11.5   68     5  19
20    -11      44  9.7   62     5  20
21     -1       8  9.7   59     5  21
22    -11     320 16.6   73     5  22
23     -4      25  9.7   61     5  23
24    -32      92 12.0   61     5  24
25     NA      66 16.6   57     5  25
26     NA     266 14.9   58     5  26
27     NA      NA  8.0   57     5  27
28    -23      13 12.0   67     5  28
29    -45     252 14.9   81     5  29
30   -115     223  5.7   79     5  30
31    -37     279  7.4   76     5  31
32     NA     286  8.6   78     6   1
33     NA     287  9.7   74     6   2
34     NA     242 16.1   67     6   3
35     NA     186  9.2   84     6   4
36     NA     220  8.6   85     6   5
37     NA     264 14.3   79     6   6
38    -29     127  9.7   82     6   7
39     NA     273  6.9   87     6   8
40    -71     291 13.8   90     6   9
41    -39     323 11.5   87     6  10
42     NA     259 10.9   93     6  11
43     NA     250  9.2   92     6  12
44    -23     148  8.0   82     6  13
45     NA     332 13.8   80     6  14
46     NA     322 11.5   79     6  15
47    -21     191 14.9   77     6  16
48    -37     284 20.7   72     6  17
49    -20      37  9.2   65     6  18
50    -12     120 11.5   73     6  19
51    -13     137 10.3   76     6  20
52     NA     150  6.3   77     6  21
53     NA      59  1.7   76     6  22
54     NA      91  4.6   76     6  23
55     NA     250  6.3   76     6  24
56     NA     135  8.0   75     6  25
57     NA     127  8.0   78     6  26
58     NA      47 10.3   73     6  27
59     NA      98 11.5   80     6  28
60     NA      31 14.9   77     6  29
61     NA     138  8.0   83     6  30
62   -135     269  4.1   84     7   1
63    -49     248  9.2   85     7   2
64    -32     236  9.2   81     7   3
65     NA     101 10.9   84     7   4
66    -64     175  4.6   83     7   5
67    -40     314 10.9   83     7   6
68    -77     276  5.1   88     7   7
69    -97     267  6.3   92     7   8
70    -97     272  5.7   92     7   9
71    -85     175  7.4   89     7  10
72     NA     139  8.6   82     7  11
73    -10     264 14.3   73     7  12
74    -27     175 14.9   81     7  13
75     NA     291 14.9   91     7  14
76     -7      48 14.3   80     7  15
77    -48     260  6.9   81     7  16
78    -35     274 10.3   82     7  17
79    -61     285  6.3   84     7  18
80    -79     187  5.1   87     7  19
81    -63     220 11.5   85     7  20
82    -16       7  6.9   74     7  21
83     NA     258  9.7   81     7  22
84     NA     295 11.5   82     7  23
85    -80     294  8.6   86     7  24
86   -108     223  8.0   85     7  25
87    -20      81  8.6   82     7  26
88    -52      82 12.0   86     7  27
89    -82     213  7.4   88     7  28
90    -50     275  7.4   86     7  29
91    -64     253  7.4   83     7  30
92    -59     254  9.2   81     7  31
93    -39      83  6.9   81     8   1
94     -9      24 13.8   81     8   2
95    -16      77  7.4   82     8   3
96    -78      NA  6.9   86     8   4
97    -35      NA  7.4   85     8   5
98    -66      NA  4.6   87     8   6
99   -122     255  4.0   89     8   7
100   -89     229 10.3   90     8   8
101  -110     207  8.0   90     8   9
102    NA     222  8.6   92     8  10
103    NA     137 11.5   86     8  11
104   -44     192 11.5   86     8  12
105   -28     273 11.5   82     8  13
106   -65     157  9.7   80     8  14
107    NA      64 11.5   79     8  15
108   -22      71 10.3   77     8  16
109   -59      51  6.3   79     8  17
110   -23     115  7.4   76     8  18
111   -31     244 10.9   78     8  19
112   -44     190 10.3   78     8  20
113   -21     259 15.5   77     8  21
114    -9      36 14.3   72     8  22
115    NA     255 12.6   75     8  23
116   -45     212  9.7   79     8  24
117  -168     238  3.4   81     8  25
118   -73     215  8.0   86     8  26
119    NA     153  5.7   88     8  27
120   -76     203  9.7   97     8  28
121  -118     225  2.3   94     8  29
122   -84     237  6.3   96     8  30
123   -85     188  6.3   94     8  31
124   -96     167  6.9   91     9   1
125   -78     197  5.1   92     9   2
126   -73     183  2.8   93     9   3
127   -91     189  4.6   93     9   4
128   -47      95  7.4   87     9   5
129   -32      92 15.5   84     9   6
130   -20     252 10.9   80     9   7
131   -23     220 10.3   78     9   8
132   -21     230 10.9   75     9   9
133   -24     259  9.7   73     9  10
134   -44     236 14.9   81     9  11
135   -21     259 15.5   76     9  12
136   -28     238  6.3   77     9  13
137    -9      24 10.9   71     9  14
138   -13     112 11.5   71     9  15
139   -46     237  6.9   78     9  16
140   -18     224 13.8   67     9  17
141   -13      27 10.3   76     9  18
142   -24     238 10.3   68     9  19
143   -16     201  8.0   82     9  20
144   -13     238 12.6   64     9  21
145   -23      14  9.2   71     9  22
146   -36     139 10.3   81     9  23
147    -7      49 10.3   69     9  24
148   -14      20 16.6   63     9  25
149   -30     193  6.9   70     9  26
150    NA     145 13.2   77     9  27
151   -14     191 14.3   75     9  28
152   -18     131  8.0   76     9  29
153   -20     223 11.5   68     9  30
    Ozone Solar.R Wind     Temp Month Day  new
1      41     190  7.4 19.44444     5   1  -41
2      36     118  8.0 22.22222     5   2  -36
3      12     149 12.6 23.33333     5   3  -12
4      18     313 11.5 16.66667     5   4  -18
5      NA      NA 14.3 13.33333     5   5   NA
6      28      NA 14.9 18.88889     5   6  -28
7      23     299  8.6 18.33333     5   7  -23
8      19      99 13.8 15.00000     5   8  -19
9       8      19 20.1 16.11111     5   9   -8
10     NA     194  8.6 20.55556     5  10   NA
11      7      NA  6.9 23.33333     5  11   -7
12     16     256  9.7 20.55556     5  12  -16
13     11     290  9.2 18.88889     5  13  -11
14     14     274 10.9 20.00000     5  14  -14
15     18      65 13.2 14.44444     5  15  -18
16     14     334 11.5 17.77778     5  16  -14
17     34     307 12.0 18.88889     5  17  -34
18      6      78 18.4 13.88889     5  18   -6
19     30     322 11.5 20.00000     5  19  -30
20     11      44  9.7 16.66667     5  20  -11
21      1       8  9.7 15.00000     5  21   -1
22     11     320 16.6 22.77778     5  22  -11
23      4      25  9.7 16.11111     5  23   -4
24     32      92 12.0 16.11111     5  24  -32
25     NA      66 16.6 13.88889     5  25   NA
26     NA     266 14.9 14.44444     5  26   NA
27     NA      NA  8.0 13.88889     5  27   NA
28     23      13 12.0 19.44444     5  28  -23
29     45     252 14.9 27.22222     5  29  -45
30    115     223  5.7 26.11111     5  30 -115
31     37     279  7.4 24.44444     5  31  -37
32     NA     286  8.6 25.55556     6   1   NA
33     NA     287  9.7 23.33333     6   2   NA
34     NA     242 16.1 19.44444     6   3   NA
35     NA     186  9.2 28.88889     6   4   NA
36     NA     220  8.6 29.44444     6   5   NA
37     NA     264 14.3 26.11111     6   6   NA
38     29     127  9.7 27.77778     6   7  -29
39     NA     273  6.9 30.55556     6   8   NA
40     71     291 13.8 32.22222     6   9  -71
41     39     323 11.5 30.55556     6  10  -39
42     NA     259 10.9 33.88889     6  11   NA
43     NA     250  9.2 33.33333     6  12   NA
44     23     148  8.0 27.77778     6  13  -23
45     NA     332 13.8 26.66667     6  14   NA
46     NA     322 11.5 26.11111     6  15   NA
47     21     191 14.9 25.00000     6  16  -21
48     37     284 20.7 22.22222     6  17  -37
49     20      37  9.2 18.33333     6  18  -20
50     12     120 11.5 22.77778     6  19  -12
51     13     137 10.3 24.44444     6  20  -13
52     NA     150  6.3 25.00000     6  21   NA
53     NA      59  1.7 24.44444     6  22   NA
54     NA      91  4.6 24.44444     6  23   NA
55     NA     250  6.3 24.44444     6  24   NA
56     NA     135  8.0 23.88889     6  25   NA
57     NA     127  8.0 25.55556     6  26   NA
58     NA      47 10.3 22.77778     6  27   NA
59     NA      98 11.5 26.66667     6  28   NA
60     NA      31 14.9 25.00000     6  29   NA
61     NA     138  8.0 28.33333     6  30   NA
62    135     269  4.1 28.88889     7   1 -135
63     49     248  9.2 29.44444     7   2  -49
64     32     236  9.2 27.22222     7   3  -32
65     NA     101 10.9 28.88889     7   4   NA
66     64     175  4.6 28.33333     7   5  -64
67     40     314 10.9 28.33333     7   6  -40
68     77     276  5.1 31.11111     7   7  -77
69     97     267  6.3 33.33333     7   8  -97
70     97     272  5.7 33.33333     7   9  -97
71     85     175  7.4 31.66667     7  10  -85
72     NA     139  8.6 27.77778     7  11   NA
73     10     264 14.3 22.77778     7  12  -10
74     27     175 14.9 27.22222     7  13  -27
75     NA     291 14.9 32.77778     7  14   NA
76      7      48 14.3 26.66667     7  15   -7
77     48     260  6.9 27.22222     7  16  -48
78     35     274 10.3 27.77778     7  17  -35
79     61     285  6.3 28.88889     7  18  -61
80     79     187  5.1 30.55556     7  19  -79
81     63     220 11.5 29.44444     7  20  -63
82     16       7  6.9 23.33333     7  21  -16
83     NA     258  9.7 27.22222     7  22   NA
84     NA     295 11.5 27.77778     7  23   NA
85     80     294  8.6 30.00000     7  24  -80
86    108     223  8.0 29.44444     7  25 -108
87     20      81  8.6 27.77778     7  26  -20
88     52      82 12.0 30.00000     7  27  -52
89     82     213  7.4 31.11111     7  28  -82
90     50     275  7.4 30.00000     7  29  -50
91     64     253  7.4 28.33333     7  30  -64
92     59     254  9.2 27.22222     7  31  -59
93     39      83  6.9 27.22222     8   1  -39
94      9      24 13.8 27.22222     8   2   -9
95     16      77  7.4 27.77778     8   3  -16
96     78      NA  6.9 30.00000     8   4  -78
97     35      NA  7.4 29.44444     8   5  -35
98     66      NA  4.6 30.55556     8   6  -66
99    122     255  4.0 31.66667     8   7 -122
100    89     229 10.3 32.22222     8   8  -89
101   110     207  8.0 32.22222     8   9 -110
102    NA     222  8.6 33.33333     8  10   NA
103    NA     137 11.5 30.00000     8  11   NA
104    44     192 11.5 30.00000     8  12  -44
105    28     273 11.5 27.77778     8  13  -28
106    65     157  9.7 26.66667     8  14  -65
107    NA      64 11.5 26.11111     8  15   NA
108    22      71 10.3 25.00000     8  16  -22
109    59      51  6.3 26.11111     8  17  -59
110    23     115  7.4 24.44444     8  18  -23
111    31     244 10.9 25.55556     8  19  -31
112    44     190 10.3 25.55556     8  20  -44
113    21     259 15.5 25.00000     8  21  -21
114     9      36 14.3 22.22222     8  22   -9
115    NA     255 12.6 23.88889     8  23   NA
116    45     212  9.7 26.11111     8  24  -45
117   168     238  3.4 27.22222     8  25 -168
118    73     215  8.0 30.00000     8  26  -73
119    NA     153  5.7 31.11111     8  27   NA
120    76     203  9.7 36.11111     8  28  -76
121   118     225  2.3 34.44444     8  29 -118
122    84     237  6.3 35.55556     8  30  -84
123    85     188  6.3 34.44444     8  31  -85
124    96     167  6.9 32.77778     9   1  -96
125    78     197  5.1 33.33333     9   2  -78
126    73     183  2.8 33.88889     9   3  -73
127    91     189  4.6 33.88889     9   4  -91
128    47      95  7.4 30.55556     9   5  -47
129    32      92 15.5 28.88889     9   6  -32
130    20     252 10.9 26.66667     9   7  -20
131    23     220 10.3 25.55556     9   8  -23
132    21     230 10.9 23.88889     9   9  -21
133    24     259  9.7 22.77778     9  10  -24
134    44     236 14.9 27.22222     9  11  -44
135    21     259 15.5 24.44444     9  12  -21
136    28     238  6.3 25.00000     9  13  -28
137     9      24 10.9 21.66667     9  14   -9
138    13     112 11.5 21.66667     9  15  -13
139    46     237  6.9 25.55556     9  16  -46
140    18     224 13.8 19.44444     9  17  -18
141    13      27 10.3 24.44444     9  18  -13
142    24     238 10.3 20.00000     9  19  -24
143    16     201  8.0 27.77778     9  20  -16
144    13     238 12.6 17.77778     9  21  -13
145    23      14  9.2 21.66667     9  22  -23
146    36     139 10.3 27.22222     9  23  -36
147     7      49 10.3 20.55556     9  24   -7
148    14      20 16.6 17.22222     9  25  -14
149    30     193  6.9 21.11111     9  26  -30
150    NA     145 13.2 25.00000     9  27   NA
151    14     191 14.3 23.88889     9  28  -14
152    18     131  8.0 24.44444     9  29  -18
153    20     223 11.5 20.00000     9  30  -20
    Ozone Solar.R Wind     Temp Month Day        OzT
1      41     190  7.4 19.44444     5   1 2.10857143
2      36     118  8.0 22.22222     5   2 1.62000000
3      12     149 12.6 23.33333     5   3 0.51428571
4      18     313 11.5 16.66667     5   4 1.08000000
5      NA      NA 14.3 13.33333     5   5         NA
6      28      NA 14.9 18.88889     5   6 1.48235294
7      23     299  8.6 18.33333     5   7 1.25454545
8      19      99 13.8 15.00000     5   8 1.26666667
9       8      19 20.1 16.11111     5   9 0.49655172
10     NA     194  8.6 20.55556     5  10         NA
11      7      NA  6.9 23.33333     5  11 0.30000000
12     16     256  9.7 20.55556     5  12 0.77837838
13     11     290  9.2 18.88889     5  13 0.58235294
14     14     274 10.9 20.00000     5  14 0.70000000
15     18      65 13.2 14.44444     5  15 1.24615385
16     14     334 11.5 17.77778     5  16 0.78750000
17     34     307 12.0 18.88889     5  17 1.80000000
18      6      78 18.4 13.88889     5  18 0.43200000
19     30     322 11.5 20.00000     5  19 1.50000000
20     11      44  9.7 16.66667     5  20 0.66000000
21      1       8  9.7 15.00000     5  21 0.06666667
22     11     320 16.6 22.77778     5  22 0.48292683
23      4      25  9.7 16.11111     5  23 0.24827586
24     32      92 12.0 16.11111     5  24 1.98620690
25     NA      66 16.6 13.88889     5  25         NA
26     NA     266 14.9 14.44444     5  26         NA
27     NA      NA  8.0 13.88889     5  27         NA
28     23      13 12.0 19.44444     5  28 1.18285714
29     45     252 14.9 27.22222     5  29 1.65306122
30    115     223  5.7 26.11111     5  30 4.40425532
31     37     279  7.4 24.44444     5  31 1.51363636
32     NA     286  8.6 25.55556     6   1         NA
33     NA     287  9.7 23.33333     6   2         NA
34     NA     242 16.1 19.44444     6   3         NA
35     NA     186  9.2 28.88889     6   4         NA
36     NA     220  8.6 29.44444     6   5         NA
37     NA     264 14.3 26.11111     6   6         NA
38     29     127  9.7 27.77778     6   7 1.04400000
39     NA     273  6.9 30.55556     6   8         NA
40     71     291 13.8 32.22222     6   9 2.20344828
41     39     323 11.5 30.55556     6  10 1.27636364
42     NA     259 10.9 33.88889     6  11         NA
43     NA     250  9.2 33.33333     6  12         NA
44     23     148  8.0 27.77778     6  13 0.82800000
45     NA     332 13.8 26.66667     6  14         NA
46     NA     322 11.5 26.11111     6  15         NA
47     21     191 14.9 25.00000     6  16 0.84000000
48     37     284 20.7 22.22222     6  17 1.66500000
49     20      37  9.2 18.33333     6  18 1.09090909
50     12     120 11.5 22.77778     6  19 0.52682927
51     13     137 10.3 24.44444     6  20 0.53181818
52     NA     150  6.3 25.00000     6  21         NA
53     NA      59  1.7 24.44444     6  22         NA
54     NA      91  4.6 24.44444     6  23         NA
55     NA     250  6.3 24.44444     6  24         NA
56     NA     135  8.0 23.88889     6  25         NA
57     NA     127  8.0 25.55556     6  26         NA
58     NA      47 10.3 22.77778     6  27         NA
59     NA      98 11.5 26.66667     6  28         NA
60     NA      31 14.9 25.00000     6  29         NA
61     NA     138  8.0 28.33333     6  30         NA
62    135     269  4.1 28.88889     7   1 4.67307692
63     49     248  9.2 29.44444     7   2 1.66415094
64     32     236  9.2 27.22222     7   3 1.17551020
65     NA     101 10.9 28.88889     7   4         NA
66     64     175  4.6 28.33333     7   5 2.25882353
67     40     314 10.9 28.33333     7   6 1.41176471
68     77     276  5.1 31.11111     7   7 2.47500000
69     97     267  6.3 33.33333     7   8 2.91000000
70     97     272  5.7 33.33333     7   9 2.91000000
71     85     175  7.4 31.66667     7  10 2.68421053
72     NA     139  8.6 27.77778     7  11         NA
73     10     264 14.3 22.77778     7  12 0.43902439
74     27     175 14.9 27.22222     7  13 0.99183673
75     NA     291 14.9 32.77778     7  14         NA
76      7      48 14.3 26.66667     7  15 0.26250000
77     48     260  6.9 27.22222     7  16 1.76326531
78     35     274 10.3 27.77778     7  17 1.26000000
79     61     285  6.3 28.88889     7  18 2.11153846
80     79     187  5.1 30.55556     7  19 2.58545455
81     63     220 11.5 29.44444     7  20 2.13962264
82     16       7  6.9 23.33333     7  21 0.68571429
83     NA     258  9.7 27.22222     7  22         NA
84     NA     295 11.5 27.77778     7  23         NA
85     80     294  8.6 30.00000     7  24 2.66666667
86    108     223  8.0 29.44444     7  25 3.66792453
87     20      81  8.6 27.77778     7  26 0.72000000
88     52      82 12.0 30.00000     7  27 1.73333333
89     82     213  7.4 31.11111     7  28 2.63571429
90     50     275  7.4 30.00000     7  29 1.66666667
91     64     253  7.4 28.33333     7  30 2.25882353
92     59     254  9.2 27.22222     7  31 2.16734694
93     39      83  6.9 27.22222     8   1 1.43265306
94      9      24 13.8 27.22222     8   2 0.33061224
95     16      77  7.4 27.77778     8   3 0.57600000
96     78      NA  6.9 30.00000     8   4 2.60000000
97     35      NA  7.4 29.44444     8   5 1.18867925
98     66      NA  4.6 30.55556     8   6 2.16000000
99    122     255  4.0 31.66667     8   7 3.85263158
100    89     229 10.3 32.22222     8   8 2.76206897
101   110     207  8.0 32.22222     8   9 3.41379310
102    NA     222  8.6 33.33333     8  10         NA
103    NA     137 11.5 30.00000     8  11         NA
104    44     192 11.5 30.00000     8  12 1.46666667
105    28     273 11.5 27.77778     8  13 1.00800000
106    65     157  9.7 26.66667     8  14 2.43750000
107    NA      64 11.5 26.11111     8  15         NA
108    22      71 10.3 25.00000     8  16 0.88000000
109    59      51  6.3 26.11111     8  17 2.25957447
110    23     115  7.4 24.44444     8  18 0.94090909
111    31     244 10.9 25.55556     8  19 1.21304348
112    44     190 10.3 25.55556     8  20 1.72173913
113    21     259 15.5 25.00000     8  21 0.84000000
114     9      36 14.3 22.22222     8  22 0.40500000
115    NA     255 12.6 23.88889     8  23         NA
116    45     212  9.7 26.11111     8  24 1.72340426
117   168     238  3.4 27.22222     8  25 6.17142857
118    73     215  8.0 30.00000     8  26 2.43333333
119    NA     153  5.7 31.11111     8  27         NA
120    76     203  9.7 36.11111     8  28 2.10461538
121   118     225  2.3 34.44444     8  29 3.42580645
122    84     237  6.3 35.55556     8  30 2.36250000
123    85     188  6.3 34.44444     8  31 2.46774194
124    96     167  6.9 32.77778     9   1 2.92881356
125    78     197  5.1 33.33333     9   2 2.34000000
126    73     183  2.8 33.88889     9   3 2.15409836
127    91     189  4.6 33.88889     9   4 2.68524590
128    47      95  7.4 30.55556     9   5 1.53818182
129    32      92 15.5 28.88889     9   6 1.10769231
130    20     252 10.9 26.66667     9   7 0.75000000
131    23     220 10.3 25.55556     9   8 0.90000000
132    21     230 10.9 23.88889     9   9 0.87906977
133    24     259  9.7 22.77778     9  10 1.05365854
134    44     236 14.9 27.22222     9  11 1.61632653
135    21     259 15.5 24.44444     9  12 0.85909091
136    28     238  6.3 25.00000     9  13 1.12000000
137     9      24 10.9 21.66667     9  14 0.41538462
138    13     112 11.5 21.66667     9  15 0.60000000
139    46     237  6.9 25.55556     9  16 1.80000000
140    18     224 13.8 19.44444     9  17 0.92571429
141    13      27 10.3 24.44444     9  18 0.53181818
142    24     238 10.3 20.00000     9  19 1.20000000
143    16     201  8.0 27.77778     9  20 0.57600000
144    13     238 12.6 17.77778     9  21 0.73125000
145    23      14  9.2 21.66667     9  22 1.06153846
146    36     139 10.3 27.22222     9  23 1.32244898
147     7      49 10.3 20.55556     9  24 0.34054054
148    14      20 16.6 17.22222     9  25 0.81290323
149    30     193  6.9 21.11111     9  26 1.42105263
150    NA     145 13.2 25.00000     9  27         NA
151    14     191 14.3 23.88889     9  28 0.58604651
152    18     131  8.0 24.44444     9  29 0.73636364
153    20     223 11.5 20.00000     9  30 1.00000000
   user  system elapsed 
  0.053   0.004   0.062 
   user  system elapsed 
      0       0       0 

plyr documentation built on March 3, 2020, 5:07 p.m.