Re: [Rd] bug with strptime, %OS, and "."
Thanks for the reply. That's a creative way to do it, but I wanted to
use the same format string for both parsing and formatting my file
name.
I figured I should just put this on the bug tracker in case someone is
editing strptime at some point in the distant future:
https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=17208
I also made a related bug asking for e.g. "%OS6" to be accepted by
strptime.
https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=17209
Cheers,
Frederick
On Wed, Jan 11, 2017 at 01:36:07PM +, Upton, Stephen (Steve) (CIV) wrote:
> Works for me:
> > strptime("17_35_14.01234.mp3","%H_%M_%OS")$sec
> [1] 14.01234
> > strptime("17_35_14.mp3","%H_%M_%OS")$sec
> [1] 14
>
> Just leave off the ".mp3" in your time pattern.
>
> Relevant section from the help ("Details") for strptime:
> strptime converts character vectors to class "POSIXlt": its input x is first
> converted by as.character. Each input string is processed as far as
> necessary for the format specified: any trailing characters are ignored.
>
> R version 3.3.2 (2016-10-31)
> Platform: x86_64-w64-mingw32/x64 (64-bit)
> Running under: Windows 7 x64 (build 7601) Service Pack 1
>
> Stephen C. Upton
> Faculty Associate - Research
> SEED (Simulation Experiments & Efficient Designs) Center
> Operations Research Department
> Naval Postgraduate School
> Mobile: 804-994-4257
> NIPR: scup...@nps.edu
> SIPR: upto...@nps.navy.smil.mil
> SEED Center web site: http://harvest.nps.edu
> -Original Message-
> From: R-devel [mailto:r-devel-boun...@r-project.org] On Behalf Of
> frede...@ofb.net
> Sent: Tuesday, January 10, 2017 9:59 PM
> To: Dirk Eddelbuettel
> Cc: R-devel
> Subject: Re: [Rd] bug with strptime, %OS, and "."
>
> On Tue, Jan 10, 2017 at 08:13:21PM -0600, Dirk Eddelbuettel wrote:
> >
> > On 10 January 2017 at 17:48, frede...@ofb.net wrote:
> > | Hi R Devel,
> > |
> > | I just ran into a corner case with 'strptime'. Recall that the "%OS"
> > | conversion accepts fractional seconds:
> > |
> > | > strptime("17_35_14.01234.mp3","%H_%M_%OS.mp3")$sec
> > | [1] 14.01234
> > |
> > | Unfortunately for my application it seems to be "greedy", in that it
> > | tries to parse a decimal point which might belong to the rest of the
> > | format:
> > |
> > | > strptime("17_35_14.mp3","%H_%M_%OS.mp3")
> > | [1] NA
> >
> > Maybe just don't use the optional O:
> >
> >R> strptime("17_35_14.mp3","%H_%M_%S.mp3")$sec
> >[1] 14
> >R>
> >R> strptime("17_35_14.mp3","%H_%M_%S.mp3")
> >[1] "2017-01-10 17:35:14 CST"
> >R>
>
> For my application I wanted to be able to accept both formats, "14.mp3" and
> "14.01234.mp3". Since "14" and "14.01234" both parse as numbers, I thought
> "%OS" should accept both.
>
> Yes, I can work around it fairly easily.
>
> Frederick
>
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Re: [Rd] bug with strptime, %OS, and "."
Works for me:
> strptime("17_35_14.01234.mp3","%H_%M_%OS")$sec
[1] 14.01234
> strptime("17_35_14.mp3","%H_%M_%OS")$sec
[1] 14
Just leave off the ".mp3" in your time pattern.
Relevant section from the help ("Details") for strptime:
strptime converts character vectors to class "POSIXlt": its input x is first
converted by as.character. Each input string is processed as far as
necessary for the format specified: any trailing characters are ignored.
R version 3.3.2 (2016-10-31)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
Stephen C. Upton
Faculty Associate - Research
SEED (Simulation Experiments & Efficient Designs) Center
Operations Research Department
Naval Postgraduate School
Mobile: 804-994-4257
NIPR: scup...@nps.edu
SIPR: upto...@nps.navy.smil.mil
SEED Center web site: http://harvest.nps.edu
-Original Message-
From: R-devel [mailto:r-devel-boun...@r-project.org] On Behalf Of
frede...@ofb.net
Sent: Tuesday, January 10, 2017 9:59 PM
To: Dirk Eddelbuettel
Cc: R-devel
Subject: Re: [Rd] bug with strptime, %OS, and "."
On Tue, Jan 10, 2017 at 08:13:21PM -0600, Dirk Eddelbuettel wrote:
>
> On 10 January 2017 at 17:48, frede...@ofb.net wrote:
> | Hi R Devel,
> |
> | I just ran into a corner case with 'strptime'. Recall that the "%OS"
> | conversion accepts fractional seconds:
> |
> | > strptime("17_35_14.01234.mp3","%H_%M_%OS.mp3")$sec
> | [1] 14.01234
> |
> | Unfortunately for my application it seems to be "greedy", in that it
> | tries to parse a decimal point which might belong to the rest of the
> | format:
> |
> | > strptime("17_35_14.mp3","%H_%M_%OS.mp3")
> | [1] NA
>
> Maybe just don't use the optional O:
>
>R> strptime("17_35_14.mp3","%H_%M_%S.mp3")$sec
>[1] 14
>R>
>R> strptime("17_35_14.mp3","%H_%M_%S.mp3")
>[1] "2017-01-10 17:35:14 CST"
>R>
For my application I wanted to be able to accept both formats, "14.mp3" and
"14.01234.mp3". Since "14" and "14.01234" both parse as numbers, I thought
"%OS" should accept both.
Yes, I can work around it fairly easily.
Frederick
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Re: [Rd] bug with strptime, %OS, and "."
On Tue, Jan 10, 2017 at 08:13:21PM -0600, Dirk Eddelbuettel wrote:
>
> On 10 January 2017 at 17:48, frede...@ofb.net wrote:
> | Hi R Devel,
> |
> | I just ran into a corner case with 'strptime'. Recall that the "%OS"
> | conversion accepts fractional seconds:
> |
> | > strptime("17_35_14.01234.mp3","%H_%M_%OS.mp3")$sec
> | [1] 14.01234
> |
> | Unfortunately for my application it seems to be "greedy", in that it
> | tries to parse a decimal point which might belong to the rest of the
> | format:
> |
> | > strptime("17_35_14.mp3","%H_%M_%OS.mp3")
> | [1] NA
>
> Maybe just don't use the optional O:
>
>R> strptime("17_35_14.mp3","%H_%M_%S.mp3")$sec
>[1] 14
>R>
>R> strptime("17_35_14.mp3","%H_%M_%S.mp3")
>[1] "2017-01-10 17:35:14 CST"
>R>
For my application I wanted to be able to accept both formats,
"14.mp3" and "14.01234.mp3". Since "14" and "14.01234" both parse as
numbers, I thought "%OS" should accept both.
Yes, I can work around it fairly easily.
Frederick
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Re: [Rd] bug with strptime, %OS, and "."
On 10 January 2017 at 17:48, frede...@ofb.net wrote:
| Hi R Devel,
|
| I just ran into a corner case with 'strptime'. Recall that the "%OS"
| conversion accepts fractional seconds:
|
| > strptime("17_35_14.01234.mp3","%H_%M_%OS.mp3")$sec
| [1] 14.01234
|
| Unfortunately for my application it seems to be "greedy", in that it
| tries to parse a decimal point which might belong to the rest of the
| format:
|
| > strptime("17_35_14.mp3","%H_%M_%OS.mp3")
| [1] NA
Maybe just don't use the optional O:
R> strptime("17_35_14.mp3","%H_%M_%S.mp3")$sec
[1] 14
R>
R> strptime("17_35_14.mp3","%H_%M_%S.mp3")
[1] "2017-01-10 17:35:14 CST"
R>
Dirk
| If I use "_" instead of ".", then it works:
|
| > strptime("17_35_14_mp3","%H_%M_%OS_mp3")
| [1] "2017-01-10 17:35:14 PST"
|
| Perhaps a low priority, but seems like a bug to me...
|
| Thanks,
|
| Frederick
|
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--
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[Rd] bug with strptime, %OS, and "."
Hi R Devel,
I just ran into a corner case with 'strptime'. Recall that the "%OS"
conversion accepts fractional seconds:
> strptime("17_35_14.01234.mp3","%H_%M_%OS.mp3")$sec
[1] 14.01234
Unfortunately for my application it seems to be "greedy", in that it
tries to parse a decimal point which might belong to the rest of the
format:
> strptime("17_35_14.mp3","%H_%M_%OS.mp3")
[1] NA
If I use "_" instead of ".", then it works:
> strptime("17_35_14_mp3","%H_%M_%OS_mp3")
[1] "2017-01-10 17:35:14 PST"
Perhaps a low priority, but seems like a bug to me...
Thanks,
Frederick
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