[R] Converting "day of year" to "year", "month" and "day"
Rui Barradas
ru|pb@rr@d@@ @end|ng |rom @@po@pt
Mon Jan 18 00:13:54 CET 2021
Hello,
My code didn't produce only 6 rows, it displayed only 6 rows. But all
rows now have a date column.
As for the first question,
df2 <- df1[c("SWS", "date")]
selects the columns with those names. I didn't rewrite the original df1,
but if you want to, assign to df1, without creating df2.
Hope this helps,
Rui Barradas
Às 15:12 de 17/01/21, Jibrin Alhassan escreveu:
> Hi Barradas,
> Thanks for your assistance. It has brought me closer to what I am
> looking for. I tried your code as shown below:
> > df1 <- read.table("SWSdata_1998_2002", header = TRUE)
> > df1$date <- as.Date(paste(df1$year, df1$day),format = "%Y %j",origin
> = "1998-01-01")
> > head(df1)
> year day Hr SWS date
> 1 1998 1 0 344 1998-01-01
> 2 1998 2 0 346 1998-01-02
> 3 1998 3 0 356 1998-01-03
> 4 1998 4 0 332 1998-01-04
> 5 1998 5 0 302 1998-01-05
> 6 1998 6 0 329 1998-01-06
> What I need is the last two columns only (SWS, date). The first 3
> columns (year, day Hr should go). Your code produced only 6 datasets. My
> dataset is 1,826 from 1998 to 2002. How do I generate this at once?
> Many many thanks for your time. I have pasted below a section of my
> dataset for your guidance, please.
> Jibrin
> year day Hr SWS
> 1998 1 0 344.
> 1998 2 0 346.
> 1998 3 0 356.
> 1998 4 0 332.
> 1998 5 0 302.
> 1998 6 0 329.
> 1998 7 0 395.
> 1998 8 0 359.
> 1998 9 0 471.
> 1998 10 0 392.
> 1998 11 0 346.
> 1998 12 0 387.
> 1998 13 0 393.
> 1998 14 0 367.
> 1998 15 0 320.
> 1998 16 0 309.
> 1998 17 0 341.
> 1998 18 0 329.
> 1998 19 0 322.
> 1998 20 0 429.
> 1998 21 0 433.
> 1998 22 0 398.
> 1998 23 0 393.
> 1998 24 0 393.
> 1998 25 0 423.
> 1998 26 0 426.
> 1998 27 0 429.
> 1998 28 0 386.
> 1998 29 0 381.
> 1998 30 0 375.
> 1998 31 0 365.
> 1998 32 0 450.
> 1998 33 0 381.
> 1998 34 0 316.
> 1998 35 0 351.
> 1998 36 0 306.
> 1998 37 0 312.
> 1998 38 0 320.
> 1998 39 0 339.
> 1998 40 0 395.
> 1998 41 0 429.
> 1998 42 0 479.
> 1998 43 0 495.
> 1998 44 0 407.
> 1998 45 0 358.
> 1998 46 0 360.
> 1998 47 0 382.
> 1998 48 0 394.
> 1998 49 0 393.
> 1998 50 0 435.
> 1998 51 0 408.
> 1998 52 0 360.
> 1998 53 0 372.
> 1998 54 0 376.
> 1998 55 0 379.
> 1998 56 0 361.
> 1998 57 0 333.
> 1998 58 0 321.
> 1998 59 0 344.
> 1998 60 0 412.
> 1998 61 0 428.
> 1998 62 0 401.
> 1998 63 0 369.
> 1998 64 0 343.
> 1998 65 0 330.
> 1998 66 0 317.
> 1998 67 0 296.
> 1998 68 0 282.
> 1998 69 0 404.
> 1998 70 0 530.
> 1998 71 0 525.
> 1998 72 0 484.
> 1998 73 0 430.
> 1998 74 0 388.
> 1998 75 0 347.
> 1998 76 0 337.
> 1998 77 0 342.
> 1998 78 0 305.
> 1998 79 0 329.
> 1998 80 0 420.
> 1998 81 0 564.
> 1998 82 0 483.
> 1998 83 0 385.
> 1998 84 0 393.
> 1998 85 0 437.
> 1998 86 0 441.
> 1998 87 0 434.
> 1998 88 0 471.
> 1998 89 0 429.
> 1998 90 0 412.
> 1998 91 0 370.
> 1998 92 0 326.
> 1998 93 0 357.
> 1998 94 0 338.
> 1998 95 0 380.
> 1998 96 0 339.
> 1998 97 0 312.
> 1998 98 0 313.
> 1998 99 0 327.
> 1998 100 0 362.
> 1998 101 0 358.
> 1998 102 0 387.
> 1998 103 0 397.
> 1998 104 0 375.
> 1998 105 0 350.
> 1998 106 0 357.
> 1998 107 0 472.
> 1998 108 0 526.
> 1998 109 0 396.
> 1998 110 0 374.
> 1998 111 0 376.
> 1998 112 0 355.
> 1998 113 0 343.
> 1998 114 0 425.
> 1998 115 0 426.
> 1998 116 0 479.
> 1998 117 0 469.
> 1998 118 0 425.
> 1998 119 0 344.
> 1998 120 0 341.
> 1998 121 0 426.
> 1998 122 0 601.
> 1998 123 0 476.
> 1998 124 0 670.
> 1998 125 0 585.
> 1998 126 0 496.
> 1998 127 0 479.
> 1998 128 0 569.
> 1998 129 0 531.
> 1998 130 0 489.
> 1998 131 0 484.
> 1998 132 0 480.
> 1998 133 0 393.
> 1998 134 0 332.
> 1998 135 0 327.
> 1998 136 0 493.
> 1998 137 0 493.
> 1998 138 0 430.
> 1998 139 0 396.
> 1998 140 0 408.
> 1998 141 0 416.
> 1998 142 0 376.
> 1998 143 0 375.
> 1998 144 0 415.
> 1998 145 0 407.
> 1998 146 0 398.
> 1998 147 0 352.
> 1998 148 0 349.
> 1998 149 0 517.
> 1998 150 0 597.
> 1998 151 0 480.
> 1998 152 0 435.
> 1998 153 0 408.
> 1998 154 0 441.
> 1998 155 0 397.
> 1998 156 0 374.
> 1998 157 0 413.
> 1998 158 0 582.
> 1998 159 0 513.
> 1998 160 0 459.
> 1998 161 0 466.
> 1998 162 0 414.
> 1998 163 0 354.
> 1998 164 0 341.
> 1998 165 0 343.
> 1998 166 0 369.
> 1998 167 0 411.
> 1998 168 0 355.
> 1998 169 0 333.
> 1998 170 0 443.
> 1998 171 0 426.
> 1998 172 0 419.
> 1998 173 0 404.
> 1998 174 0 387.
> 1998 175 0 460.
> 1998 176 0 447.
> 1998 177 0 469.
> 1998 178 0 447.
> 1998 179 0 389.
> 1998 180 0 375.
> 1998 181 0 354.
> 1998 182 0 316.
> 1998 183 0 369.
> 1998 184 0 410.
> 1998 185 0 406.
> 1998 186 0 477.
> 1998 187 0 583.
> 1998 188 0 458.
> 1998 189 0 386.
> 1998 190 0 342.
> 1998 191 0 333.
> 1998 192 0 369.
> 1998 193 0 406.
> 1998 194 0 375.
> 1998 195 0 332.
> 1998 196 0 310.
> 1998 197 0 528.
> 1998 198 0 530.
> 1998 199 0 387.
> 1998 200 0 385.
> 1998 201 0 349.
> 1998 202 0 409.
> 1998 203 0 399.
> 1998 204 0 619.
> 1998 205 0 658.
> 1998 206 0 581.
> 1998 207 0 445.
> 1998 208 0 370.
> 1998 209 0 326.
> 1998 210 0 334.
> 1998 211 0 384.
> 1998 212 0 423.
> 1998 213 0 412.
> 1998 214 0 404.
> 1998 215 0 370.
> 1998 216 0 384.
> 1998 217 0 383.
> 1998 218 0 378.
> 1998 219 0 461.
> 1998 220 0 460.
> 1998 221 0 400.
> 1998 222 0 447.
> 1998 223 0 373.
> 1998 224 0 379.
> 1998 225 0 374.
> 1998 226 0 374.
> 1998 227 0 391.
> 1998 228 0 348.
> 1998 229 0 303.
> 1998 230 0 279.
> 1998 231 0 312.
> 1998 232 0 331.
> 1998 233 0 298.
> 1998 234 0 341.
> 1998 235 0 493.
> 1998 236 0 436.
> 1998 237 0 400.
> 1998 238 0 633.
> 1998 239 0 630.
> 1998 240 0 583.
> 1998 241 0 547.
> 1998 242 0 550.
> 1998 243 0 499.
> 1998 244 0 444.
> 1998 245 0 427.
> 1998 246 0 401.
>
> On Sat, Jan 16, 2021 at 8:01 AM Rui Barradas <ruipbarradas using sapo.pt
> <mailto:ruipbarradas using sapo.pt>> wrote:
>
> Hello,
>
> Thanks for the data, it makes things easier.
>
> df1 <- read.table("Jibrin_data.txt", header = TRUE)
> #'data.frame': 168 obs. of 4 variables:
> # $ year: int 1998 1998 1998 1998 1998 1998 1998 1998 1998 1998 ...
> # $ day : int 1 2 3 4 5 6 7 8 9 10 ...
> # $ Hr : int 0 0 0 0 0 0 0 0 0 0 ...
> # $ SWS : num 344 346 356 332 302 329 395 359 471 392 ...
>
> Here is a simple way of converting the year and day of year columns
> to a
> column of class "Date".
> Like others have said, there are also CRAN packages to handle date/time
> data, my favorite being package lubridate, but base R can do it.
>
>
> df1$date <- as.Date(paste(df1$year, df1$day),
> format = "%Y %j",
> origin = "1998-01-01")
>
> head(df1)
> # year day Hr SWS date
> #1 1998 1 0 344 1998-01-01
> #2 1998 2 0 346 1998-01-02
> #3 1998 3 0 356 1998-01-03
> #4 1998 4 0 332 1998-01-04
> #5 1998 5 0 302 1998-01-05
> #6 1998 6 0 329 1998-01-06
>
>
> Hope this helps,
>
> Rui Barradas
>
>
> Às 06:48 de 16/01/21, Jibrin Alhassan escreveu:
> > Hi Barradas
> > Sorry for the delay. Below is a section of my data. I have up
> to 1826
> > covering 1998 to 2002
> > year day Hr SWS
> > 1998 1 0 344.
> > 1998 2 0 346.
> > 1998 3 0 356.
> > 1998 4 0 332.
> > 1998 5 0 302.
> > 1998 6 0 329.
> > 1998 7 0 395.
> > 1998 8 0 359.
> > 1998 9 0 471.
> > 1998 10 0 392.
> > 1998 11 0 346.
> > 1998 12 0 387.
> > 1998 13 0 393.
> > 1998 14 0 367.
> > 1998 15 0 320.
> > 1998 16 0 309.
> > 1998 17 0 341.
> > 1998 18 0 329.
> > 1998 19 0 322.
> > 1998 20 0 429.
> > 1998 21 0 433.
> > 1998 22 0 398.
> > 1998 23 0 393.
> > 1998 24 0 393.
> > 1998 25 0 423.
> > 1998 26 0 426.
> > 1998 27 0 429.
> > 1998 28 0 386.
> > 1998 29 0 381.
> > 1998 30 0 375.
> > 1998 31 0 365.
> > 1998 32 0 450.
> > 1998 33 0 381.
> > 1998 34 0 316.
> > 1998 35 0 351.
> > 1998 36 0 306.
> > 1998 37 0 312.
> > 1998 38 0 320.
> > 1998 39 0 339.
> > 1998 40 0 395.
> > 1998 41 0 429.
> > 1998 42 0 479.
> > 1998 43 0 495.
> > 1998 44 0 407.
> > 1998 45 0 358.
> > 1998 46 0 360.
> > 1998 47 0 382.
> > 1998 48 0 394.
> > 1998 49 0 393.
> > 1998 50 0 435.
> > 1998 51 0 408.
> > 1998 52 0 360.
> > 1998 53 0 372.
> > 1998 54 0 376.
> > 1998 55 0 379.
> > 1998 56 0 361.
> > 1998 57 0 333.
> > 1998 58 0 321.
> > 1998 59 0 344.
> > 1998 60 0 412.
> > 1998 61 0 428.
> > 1998 62 0 401.
> > 1998 63 0 369.
> > 1998 64 0 343.
> > 1998 65 0 330.
> > 1998 66 0 317.
> > 1998 67 0 296.
> > 1998 68 0 282.
> > 1998 69 0 404.
> > 1998 70 0 530.
> > 1998 71 0 525.
> > 1998 72 0 484.
> > 1998 73 0 430.
> > 1998 74 0 388.
> > 1998 75 0 347.
> > 1998 76 0 337.
> > 1998 77 0 342.
> > 1998 78 0 305.
> > 1998 79 0 329.
> > 1998 80 0 420.
> > 1998 81 0 564.
> > 1998 82 0 483.
> > 1998 83 0 385.
> > 1998 84 0 393.
> > 1998 85 0 437.
> > 1998 86 0 441.
> > 1998 87 0 434.
> > 1998 88 0 471.
> > 1998 89 0 429.
> > 1998 90 0 412.
> > 1998 91 0 370.
> > 1998 92 0 326.
> > 1998 93 0 357.
> > 1998 94 0 338.
> > 1998 95 0 380.
> > 1998 96 0 339.
> > 1998 97 0 312.
> > 1998 98 0 313.
> > 1998 99 0 327.
> > 1998 100 0 362.
> > 1998 101 0 358.
> > 1998 102 0 387.
> > 1998 103 0 397.
> > 1998 104 0 375.
> > 1998 105 0 350.
> > 1998 106 0 357.
> > 1998 107 0 472.
> > 1998 108 0 526.
> > 1998 109 0 396.
> > 1998 110 0 374.
> > 1998 111 0 376.
> > 1998 112 0 355.
> > 1998 113 0 343.
> > 1998 114 0 425.
> > 1998 115 0 426.
> > 1998 116 0 479.
> > 1998 117 0 469.
> > 1998 118 0 425.
> > 1998 119 0 344.
> > 1998 120 0 341.
> > 1998 121 0 426.
> > 1998 122 0 601.
> > 1998 123 0 476.
> > 1998 124 0 670.
> > 1998 125 0 585.
> > 1998 126 0 496.
> > 1998 127 0 479.
> > 1998 128 0 569.
> > 1998 129 0 531.
> > 1998 130 0 489.
> > 1998 131 0 484.
> > 1998 132 0 480.
> > 1998 133 0 393.
> > 1998 134 0 332.
> > 1998 135 0 327.
> > 1998 136 0 493.
> > 1998 137 0 493.
> > 1998 138 0 430.
> > 1998 139 0 396.
> > 1998 140 0 408.
> > 1998 141 0 416.
> > 1998 142 0 376.
> > 1998 143 0 375.
> > 1998 144 0 415.
> > 1998 145 0 407.
> > 1998 146 0 398.
> > 1998 147 0 352.
> > 1998 148 0 349.
> > 1998 149 0 517.
> > 1998 150 0 597.
> > 1998 151 0 480.
> > 1998 152 0 435.
> > 1998 153 0 408.
> > 1998 154 0 441.
> > 1998 155 0 397.
> > 1998 156 0 374.
> > 1998 157 0 413.
> > 1998 158 0 582.
> > 1998 159 0 513.
> > 1998 160 0 459.
> > 1998 161 0 466.
> > 1998 162 0 414.
> > 1998 163 0 354.
> > 1998 164 0 341.
> > 1998 165 0 343.
> > 1998 166 0 369.
> > 1998 167 0 411.
> > 1998 168 0 355.
> > Thanks
> > Jibrin
> >
> > On Fri, Jan 15, 2021 at 7:15 PM Rui Barradas
> <ruipbarradas using sapo.pt <mailto:ruipbarradas using sapo.pt>
> > <mailto:ruipbarradas using sapo.pt <mailto:ruipbarradas using sapo.pt>>> wrote:
> >
> > Hello,
> >
> > No dataset was attached. Like the posting guide says,
> >
> > No binary attachments except for PS, PDF, and some image and
> archive
> > formats (others are automatically stripped off because they
> can contain
> > malicious software). Files in other formats and larger ones
> should
> > rather be put on the web and have only their URLs posted.
> This way a
> > reader has the option to download them or not.
> >
> >
> > Can you post sample data? Please post the output of
> `dput(df)`. Or, if
> > it is too big the output of `dput(head(df, 20))`. (`df` is
> the name of
> > your dataset.)
> >
> > Hope this helps,
> >
> > Rui Barradas
> >
> > Às 11:30 de 15/01/21, Jibrin Alhassan escreveu:
> > > Dear R users,
> > > I am very new to R software. I have solar wind speed data
> needed
> > for my
> > > work. How do I convert day in the year to year, month, and
> day with R
> > > software? I have used this code
> > > as.Date(0, origin = "1998-01-01")
> > > but it can only convert one day of the year at a time.
> Meanwhile,
> > I have up
> > > to the 1998-2002 data set. Attached is my data.
> > > Kindly help, please.
> > > Jibrin Alhassan
> > > ______________________________________________
> > > R-help using r-project.org <mailto:R-help using r-project.org>
> <mailto:R-help using r-project.org <mailto:R-help using r-project.org>> mailing list
> > -- To UNSUBSCRIBE and more, see
> > > https://stat.ethz.ch/mailman/listinfo/r-help
> > > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > > and provide commented, minimal, self-contained,
> reproducible code.
> > >
> >
>
More information about the R-help
mailing list