Displaying 20 results from an estimated 6000 matches similar to: "strptime format argument"
2009 Jul 11
2
Date conversions
Hi all,
I'm having a little bit of trouble with some date conversions and
am hoping someone can help me out. Thanks in advance.
OK, I have two sources of data that provide date info in a csv file
differently. I've attached a small zipped file with two text files
that illustrate both. (Is it ok to send attachments to this list? Not
sure. It's very small.) I need to be able to
2012 Nov 10
4
help on date dataset
Hi everybody,
I am beginer in R and I need your precious help.
I want to create a small function in R as in sas to retrieve date.
I have a file with data that import in R.
DATE PAYS nb_pays.ILI.
1 24/04/2009 usa 0
2 24/04/2009 usa 0
3 24/04/2009 Mexique 0
4 24/04/2009
2006 Dec 28
3
Dates in R
Hello all,
Can somebody point me to references or provide some code on dealing with
this date issue. Basically, I have two vectors of values that represent
dates. I want to convert these values into a date format and subtract the
differences to show elapsed time in days. More specifically, here is the
example:
Date1 Date2
032398 061585
032398 061585
111694 101994
111694
2005 Feb 24
2
Row median of Date class variables in a data frame
I am trying to calculate the median of each row of a
data frame where the data frame consist of
columns of class Date.
Below are my test data and best attempt at using apply.
I didn't see a solution via Google or the Baron search
site.
I'd be grateful for any suggestions or solutions.
I'm using R 2.0.0 on Mac OS X.
Thank you,
Stephen Weigand
### Test data
date1 <- c(1000,
2015 Nov 06
4
Puzzled by eval
I am currently puzzled by a seach path behavior. I have a library of a dozen routines
getlabs(), getssn(), getecg(), ... that interface to local repositories and pull back
patient information. All have a the first 6 arguments in common, and immediately call a
second routine to do initial processing of these 6. The functions "joe" and "fred" below
capture the relevant
2009 Dec 09
1
reshape() makes R run out of memory (PR#14121)
Full_Name: Alexander L. Belikoff
Version: 2.8.1
OS: Ubuntu 9.04 (x86_64)
Submission from: (NULL) (67.244.71.200)
I'm trying to reshape the following data frame:
ID DATE1 DATE2 VALUE_TYPE VALUE
'abcd1233' 2009-11-12 2009-12-23 'TYPE1' 123.45
...
VALUE_TYPE is a string and is a factor with only 2 values
2012 May 12
1
Query regarding date as argument in functions - and about sqldf
Hi,
I have a query about sqldf, and dates in general. I couldnt find much on
the net or on the forums, hence I am here. Here is the issue:
I want to write a function that accepts 3 arguments: date1, date2 and a
dataframe, say 'df'. Within the function, I want to populate a temp
dataframe which essentially contains the output of the query "select * from
df where DATE between date1
2011 Aug 07
1
all.equal doesn't work for POSIXlt objects
Hi all,
following sample code illustrates the problem :
Date1 <- Date2 <-
as.POSIXlt(seq.Date(as.Date("2010-04-01"),as.Date("2011-04-01"),by='day'))
identical(Date1,Date2)
all.equal(Date1,Date2)
identical() gives the correct answer. As there is no all.equal method
for POSIXlt objects, all.equal.list is used instead. Subsetting using
[[]] doesn't work
2012 Mar 07
1
date columns chooser
i have a data frame with 2 columns of dates.
with str(dataframe) i have ensured myself that they were indeed formatted
as dates.
one column has NA's in it.
the aim is now to make a third column that chooses date1 if it is a date,
and choose date2 if it is a NA.
i am trying
df$date3=ifelse(is.na(df$date1), df$date2, df$date1).
this leads to unexpected behaviour: the resulting column is
2013 Apr 13
2
Comparison of Date format
Hi,
?In the example you provided, it looks like the dates in Date2 happens first.? So, I changed it a bit.?
DataA<- read.table(text="
ID,Status,Date1,Date2 ??? ??? ??????
1,A,3-Feb-01,15-May-01 ??? ???
1,B,15-May-01,16-May-01 ??? ???
1,A,16-May-01,3-Sep-01 ??? ??? ??? ??? ???
1,B,3-Sep-01,13-Sep-01 ??? ??? ??? ??? ???
1,C,13-Sep-01,26-Feb-04 ??? ??? ??? ??? ???
2009 Jan 27
1
Mystery Error in midnightStandard
I wasn't even aware I was using midnightStandard. You won't find it in my
script.
Here is the relevant loop:
date1 = timeDate(charvec = Sys.Date(), format = "%Y-%m-%d")
date1
dow = 3;
for (i in 1:length(V4) ) {
x = read.csv(as.character(V4[[i]]), header = FALSE, na.strings="");
y = x[,1];
year = V2[[i]];
week = V3[[i]];
dtstr =
2005 Oct 04
2
Joining Dataframes
I am attempting to join several dataframes that summarize sampling effort
for different samples into one large data.frame/table.
I have looked at the merge command, but have not been clever enough to
figure out how to get it to do what I want.
A simplified example of what I am trying to do:
The dataframes I have look like this (they were generated using the table
command)
species1.effort
2017 Jun 21
0
Help/ Mathematics
Hi Ahmed,
Your problem appears trivial as you have already specified the form of
the calculation.
Learn how to "extract" specified elements from a data structure:
# first value
sum(dataset1$NPP[dataset1$date >= date1 &
dataset1$date <= date2])
# second value
dataset2$biomass[dataset2$date == date2] -
dataset2$biomass[dataset2$date == date1]
# third value
2006 Jan 15
4
form inputs resetting on sumbit
I searched for forum for something about this but couldn''t find
anything.
For example I have this in my view: (you enter start/end dates from
dropdowns, pick a category and a report is generated.)
<%= start_form_tag :action => ''display_report'' %>
From: <%= date_select ''report'', ''date1'' %> <br />
To: <%=
2009 Jan 21
3
Error as.Date on Invalid Dates
Hi All,
I have an script in R which accepts user inputs for certain parameters,
particularly dates, which the user inputs as character strings.
eg:
> date1 <- "2009-01-21"
The script later parses the input via the as.Date function:
> as.Date(date1)
However, as.Date encounters an error when the string does not represent an
actual date.
eg:
> date1 <-
2013 Mar 09
1
Unexpected behavior looping through sequence of dates
I understand that the two following loops should produce the exact same output. However, they do not. It appears that looping directly through the sequence of Date objects somehow makes them be coerced to numeric:
> date1 = "20130301"
> date2 = "20130302"
>
> d1 = as.Date(date1, format="%Y%m%d", tz="GMT")
> d2 = as.Date(date2,
1999 Jun 01
1
setting permissions...
hi all,
i've searched the samba archived but found little information on the topic
related to setting permissions.
i wanted to have this effect on a share --
SHARE:
[answers]
|
+--- 1 ---+-- date1
| |
| +-- date2
|
+--- 2 ---+-- date1
|
+-- date2
GROUPS: faculty, students
PATH: /home/samba/shares/answers
../answers/ (faculty
2005 May 06
2
2 simple questions
Please excuse what I'm sure are very easy questions but I'm relatively new
to the R environment.
How can I view a range of list elements, but not all. e.g., I had a matrix
of patients and then split them out by patient id. I know I can do
patlist[[1]] to see the first one, but how can I view, say, the first ten
patients?
My other question is how to count how many patients have a
2013 Mar 05
1
ggplot2: two time series with different dates in a single plot
Hi
Using the ggplot2 package, I would like to obtain a plot that contains two
time series that have data points on different dates.
For instance, one data frame looks like:
date1, value1
2010-01-05, 2921.74
2010-01-08, 2703.89
2010-01-14, 3594.21
2010-01-20, 3659.22
The other data frame looks like
date2, value2
2010-01-01, 285.85
2010-01-02, 229.20
2010-01-05, 333.91
2010-01-06, 338.27
2008 Oct 28
3
Dose Profile
Hi Everyone,
I have data in a long format e.g. there is one row per patient but each
follow-up appointment is included in the row. So, a snippet of the data
looks like this:
TrialNo Drug Sex Rand Adate1 Date1 Dose1 Time1 Adate2 Date2 Dose2
Time2 B1001029 LTG M 15719 30/04/2003 15825 150 106 29/08/2003 15946 200
227 B1117003 LTG M 15734 30/04/2003 15825 200 91 03/09/2003 15951 250 217