Hi David,
The strangeness comes from chron:
?format.chron
format: vector or list specifying the input format of the input. The
format can be either strings specifying one of the recognized
formats below or a list of user-supplied functions to convert
dates from character into Julian dates and vice versa.
The dates format can be any permutation of the characters
'"d"', '"m"', or '"y"' delimited by a separator (possibly
null), e.g., '"m/d/y"', '"d-m-y"', '"ymd"', are all valid;
the format can also be permutations of the words '"day"',
'"month"' and '"year"' (with non-null separator), which
produces the month name, e.g., '"month day year"' produces
'"April 20 1992"', '"day mon year"' produces '"20 Apr 1992"'.
The times format can be any permutation of '"h"', '"m"', and
'"s"' separated by any one non-special character. The
default is '"h:m:s"'.
format(as.chron(Sys.time())+1:10, format=c(dates="m-d-y",times="h"))
Error in parse.format(format.) : unrecognized format h
format(as.chron(Sys.time())+1:10, format=c(dates="m-d-y",times="h:m:s"))
[1] "(12-11-08 21:08:12)" "(12-12-08 21:08:12)" "(12-13-08 21:08:12)"
[4] "(12-14-08 21:08:12)" "(12-15-08 21:08:12)" "(12-16-08 21:08:12)"
[7] "(12-17-08 21:08:12)" "(12-18-08 21:08:12)" "(12-19-08 21:08:12)"
[10] "(12-20-08 21:08:12)"
so for plot.xts the default is causing issues (as it tries to
automatically format for visual usefulness).
Try:
plot(xts(rnorm(10),as.chron(Sys.time())+1:10),
major.format=c(dates='m-d-y',times='h:m:s'))
I'll add a test in plot.xts to handle this formatting convention if it
is a chron object.
HTH
Jeff
On Wed, Dec 10, 2008 at 2:57 PM, <davidr at rhotrading.com> wrote:
I cannot figure out what's wrong here.
If someone could shed some light, I'd appreciate it very much.
I form an xts object with a chron index (small version here) that seems
OK, but I can't plot it:
Error in parse.format(format[1]) : unrecognized format %b %d%n%H:%M:%S
An 'xts' object from (12/07/08 19:46:40) to (12/07/08 19:46:50)
containing:
Data: num [1:11, 1] 98 98 98 98 98 ...
- attr(*, "dimnames")=List of 2
..$ : NULL
..$ : NULL
Indexed by: Classes 'chron', 'dates', 'times' atomic [1:11] 14221
14221 14221 14221 14221 ...
..- attr(*, "format")= Named chr [1:2] "m/d/y" "h:m:s"
.. ..- attr(*, "names")= chr [1:2] "dates" "times"
..- attr(*, "origin")= Named num [1:3] 1 1 1970
.. ..- attr(*, "names")= chr [1:3] "month" "day" "year"
xts Attributes:
NULL
Index gesmall
Min. :(12/07/08 19:46:40) Min. :98.04
1st Qu.:(12/07/08 19:46:42) 1st Qu.:98.04
Median :(12/07/08 19:46:45) Median :98.04
Mean :(12/07/08 19:46:45) Mean :98.04
3rd Qu.:(12/07/08 19:46:48) 3rd Qu.:98.04
Max. :(12/07/08 19:46:50) Max. :98.04
(12/07/08 19:46:40) 98.04
(12/07/08 19:46:41) 98.04
(12/07/08 19:46:42) 98.04
(12/07/08 19:46:43) 98.04
(12/07/08 19:46:44) 98.04
(12/07/08 19:46:45) 98.04
(12/07/08 19:46:46) 98.04
(12/07/08 19:46:47) 98.04
(12/07/08 19:46:48) 98.04
(12/07/08 19:46:49) 98.04
(12/07/08 19:46:50) 98.04
# It looks as if there are somehow empty field names; not sure how
that happens or if it's important
R version 2.8.0 Patched (2008-11-02 r46817)
i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] xts_0.0-16 zoo_1.5-4 chron_2.3-24
loaded via a namespace (and not attached):
[1] grid_2.8.0 lattice_0.17-15 tools_2.8.0
Thanks,
-- David