Displaying 20 results from an estimated 2000 matches similar to: "try / tryCatch for download.file( ) within a for loop when URL does not exist"
2007 Oct 15
1
String concatenation, File Path Handling to pass to download.file( ) [backslash in DOS paths]
Gabor,
Thanks much. Your solution is elegant. My overall scheme is to take
present date, and check whether it is a weekend, if not, then create a
string based on the date, to concatenate into a url link for
download.file( ). The files I need to download have a part which is in
the format: mmddyy. I am working to make myself a system to connect to
exchanges, and download end of day files from
2007 Oct 15
3
for loop if else conditional
date <- as.POSIXlt(Sys.time()) #present date
for (i in 1:difftime(as.POSIXlt(Sys.Date()),"2007-10-01"))
if (date$wday != 0 & date$wday != 6) {print(date);assign("date",
(date-86400))} else (assign("date", (date-86400)))
I am trying to print dates from present day to a day in the past, but
omitting weekends. I am not doing something right, but can't
2008 Jan 10
5
diff in a dataframe
I have a dataframe say:
date price_g price_s
0.34 0.56
0.36 0.76
. .
. .
. .
and so on. say, 1000 rows.
Is it possible to add two columns to this dataframe, by computing say
diff(log(price_g) and diff(log(price_s)) ?
The elements in the first row of these columns cannot be computed, but
2005 Apr 22
2
help with POSIX
For the r script below
>datestr <- "01/01/2004"
>as.POSIXct(as.Date(datestr, "%d/%m/%Y"))
I get the following output
"2003-12-31 18:00:00 Central Standard Time"
Why is the date a day before. I guess its something to do with the time, but is there a way to get it to return 2004-01-01 instead?
Thanks in advance...
-Sandeep
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2008 Apr 04
1
RODBC / odbcConnectExcel Issue
Can someone throw light on the following problem I am having with RODBC?
There's an Excel file I am trying to read from, it has one sheet named
'nameclass'.
Thanks in anticipation.
Vishal Belsare
> library(RODBC)
> con = odbcConnectExcel(file.choose())
> tbls <- sqlTables(con)
> tbls
TABLE_CAT TABLE_SCHEM TABLE_NAME TABLE_TYPE REMARKS
1
2009 Mar 26
1
ApEn (Approximate Entropy), Total Corr, Information Interaction
Is there any existing implementation in R/S of :
1] Pincus & Kalman's approximate entropy (ApEn) measure
2] Total Correlation / Multiinformation
3] Information Interaction
A search doesn't quite reveal anything, but I'd be keen to not
reinvent in case someone has worked on it. Many thanks in
anticipation.
Best,
Vishal Belsare
2008 Jan 14
1
zoo object
I have an ordered series of 3 month t-bill rates (annual). I transform
this to a daily series, however, the observations are constructed only
from the dates on which the t-bills were issued, which is every week.
So now I have ordered observations of the daily 'risk-free rate' for
one day every week. I want to expand this zoo object to give a value
for every day, and to do so, copy the
2008 May 25
1
n Realizations of a Stochastic Process assigned to dynamically generated variable names?
I am interested in creating multiple (say 1000) time series, from a
given stochastic process, of length 250. I want to refer to each
realization with its own variable name, of the format say, tsn, where
n is the n'th simulation. i.e. ts1, ts2, ts3, ts4, .... , ts1000
The way I am thinking of doing this is placing the following code
within another loop, and the 'tsn' assignment should
2008 May 31
1
Representing 'Date' as 'Year - Quarter'
I have financial data on a a set of firms, with a quarterly period
(fundamental data). The data spans 10 years, and four quarters per
year. The present file (.csv) reads the Date columns as "200706" for
the second quarter of 2007; "199809" for the third quarter of 1997.
Is there a way I can convert it to something like "2007 Q2", "1998 Q3"?
I am aware of
2011 Jul 17
3
How to convert number (matlab) to date
Hello
I am new to R and I need to convert some dates (numeric format by matlab) to actual dates in R.
For instance,
Matlab -> 730456 -> >> datestr(730456)
ans =
02-Dec-1999
R -
> library(zoo)
> as.Date(730456)
[1] "3969-12-03"
I don't not mind the output format but it needs to be right.
Many thanks
Ed
2013 Oct 04
2
Possible POSIXlt / wday glitch & bugs.r-project.org status
Wanted to raise two questions:
1. Is bugs.r-project.org down? I haven't been able to reach it for two or three days:
```
ping bugs.r-project.org
PING rbugs.research.att.com (207.140.168.137): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
2008 Dec 11
3
getting ISO week
Hi all,
Is there a simple function already implemented for getting the ISO
weeks of a Date object?
I couldn't find one, and so wrote my own function to do it, but would
appreciate a pointer to the "default" way. If a function is not yet
implemented, could the code below be of interest to submit to CRAN?
Best Regards,
Gustaf
--------------------
2011 May 14
2
changing the day of the week in dates format
Dear all,
I have a question related to the POSIXlt function in R.
I have a set of dates and times, for exmaple:
startx <- as.POSIXct("2011-01-01 00:00:00")
finx <- as.POSIXct("2011-12-31 00:00:00")
daysx<- seq(startx, finx, by="24 hours")
I
want to change the dates of all the days falling on a Saturday to the
next working day (i.e. Monday). So I
2020 Oct 23
2
The presence/absence of `zone` in POSIXlt depending on time zone as a cause of possible inconsistences?
Dear all,
I have just detected what seems a minor inconsistence with data types. If one unlists a POSIXlt time with GMT zone gets a numeric vector, since the POSIXlt list has no `zone` element, while if one unlists a POSIXlt time with a non GMT zone (also non specifying tz if the Sys.timezone is not GMT) gets a character vector due to including the `zone` element.
> x <-
2005 Oct 06
2
isdst
Can someone, please, explain the difference is results below (notice
the isdst value)
> unlist(as.POSIXlt('2005-7-1'))
sec min hour mday mon year wday yday isdst
0 0 0 1 6 105 5 181 1
> unlist(as.POSIXlt(as.Date('2005-7-1')))
sec min hour mday mon year wday yday isdst
0 0 0 1 6 105 5 181 0
2020 Oct 01
3
timezone tests and R-devel
The return value of Sys.time() today with a timezone of US/Eastern is
unchanged between 4.0.3-patched and devel, but on devel the following test
fails
all.equal(x, as.POSIXlt(x))
with
x = Sys.time()
This means that devel does not complete make tests (failure on
tests/reg-tests-2.R)
It is entirely possible that it is an error on my end, I use
export TZ="US/Eastern"
but I have been
2007 Dec 11
3
Wrong length of POSIXt vectors (PR#10507)
Full_Name: Petr Simecek
Version: 2.5.1, 2.6.1
OS: Windows XP
Submission from: (NULL) (195.113.231.2)
Several times I have experienced that a length of a POSIXt vector has not been
computed right.
Example:
tv<-structure(list(sec = c(50, 0, 55, 12, 2, 0, 37, NA, 17, 3, 31
), min = c(1L, 10L, 11L, 15L, 16L, 18L, 18L, NA, 20L, 22L, 22L
), hour = c(12L, 12L, 12L, 12L, 12L, 12L, 12L, NA, 12L,
2006 Apr 10
3
timeAlign
I use POSIXct for datetimes. Is thee a timeAlign function that I can
use where :
align by year
direction -1 ==> start of this year
direction 1 ==> start of next year
align by week
direction -1 ==> date on last sunday
direction 1 ==> date on next sunday
align by day
direction -1 ==> time at past midnight
direction 1 ==> time at this comming
2002 Feb 11
2
Time Series ts() Objects
Hi,
Is it possible to create a ts() object, whose data is daily based BUT
measured only on working days?
In other words, suppose I have a data set with 255 observations, measured
from 29 June 1959 to 30 June 1960. How would I create such a data? I
tried something like:
ts(c(...), start(1959, 180))
but I'm not sure what to use for frequency. In other words I don't know
how to
2007 Jan 25
2
Days of the week?
Hi WizaRds,
What is the "standard" way to get the day of the week from a date such
as as.Date("2006-12-01")? It looks like fCalendar has some functions
but this requires a change in the R locale to GMT. Is there another way?
Thanks!
Jack.
---------------------------------
Be a PS3 game guru.
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