Displaying 20 results from an estimated 3000 matches similar to: "merging 2 frames while keeping all the entries from the "reference" frame"
2011 Jul 14
2
cbind in aggregate formula - based on an existing object (vector)
Hello!
I am aggregating using a formula in aggregate - of the type:
aggregate(cbind(var1,var2,var3)~factor1+factor2,sum,data=mydata)
However, I actually have an object (vector of my variables to be aggregated):
myvars<-c("var1","var2","var3")
I'd like my aggregate formula (its "cbind" part) to be able to use my
"myvars" object. Is it
2011 Apr 18
1
using "aggregate" when variable names contain spaces
Hello!
my data set has many variables. Unfortuantely, many of those variables
contain spaces in their names.
I need advice on: how to refer to variable names in the formula for
"aggregate". See example below:
### Generating example data set:
mydate = rep(seq(as.Date("2008-12-01"), length = 3, by = "month"),4)
value1=c(1,10,100,2,20,200,3,30,300,4,40,400)
2011 Mar 30
2
summing values by week - based on daily dates - but with some dates missing
Dear everybody,
I have the following challenge. I have a data set with 2 subgroups,
dates (days), and corresponding values (see example code below).
Within each subgroup: I need to aggregate (sum) the values by week -
for weeks that start on a Monday (for example, 2008-12-29 was a
Monday).
I find it difficult because I have missing dates in my data - so that
sometimes I don't even have the
2011 May 19
1
Creating a "shifted" month (one that starts not on the first of each month but on another date)
Hello!
I have a data frame with dates. I need to create a new "month" that
starts on the 20th of each month - because I'll need to aggregate my
data later by that "shifted" month.
I wrote the code below and it works. However, I was wondering if there
is some ready-made function in some package - that makes it
easier/more elegant?
Thanks a lot!
# Example data:
2012 Jan 11
1
Help with speed (replacing the loop?)
Dear R-ers,
I have a loop below that loops through my numeric variables in data
frame x and through levels of the factor "group" and multiplies (group
by group) the values of numeric variables in x by the corresponding
group-specific values from data frame y. In reality, my:
dim(x) is 300,000 rows by 100 variables, and
dim(y) is 120 levels of "group" by 100 variables.
So, my
2009 Oct 06
2
Extracting year from a date object
Hi all,
this one left me a bit puzzled, as I don't seem to find a function to
perform this easily. I must have overlooked the obvious, so sorry in
advance.
I have a list of dates in numerical format (i.e. 34576), defined as
the number of days that passed since january 1st 1900. So I apply the
function :
> MyDate <-as.Date(34576,origin="1900-01-01")
> MyDate
[1]
2006 May 21
1
POSIX, time zone and Windows
Dear Listers,
Apologize to pile up on the 'tz' issue in POSIX objects. I have a
'simple' thing on which I must make up my mind but cannot do it from the
existing R-help threads. I am currently working on dog telemetry in
China, and download time information from GPS collars. I would like to
set up the corresponding POSIXxx variables in R to a given time zone. Eg
Pekin
2011 May 03
0
turning data with start and end date into daily data
Hello!
I have data that contain, among other things the date for the
beginning and for the end of a (daily) time series (see example below
- "mydata")
mystring1<-c("String 1", "String 2")
mystring2<-c("String a", "String b")
starts<-c(as.Date("2011-02-01"),as.Date("2011-03-02"))
2011 Mar 01
2
Does POSIXlt extract date components properly?
I would like to use POSIX classes to store dates and extract components of
dates. Following the example in Spector ("Data Manipulation in R"), I
create a date
> mydate = as. POSIXlt('2005-4-19 7:01:00')
I then successfully extract the day with the command
> mydate$day
[1] 19
But when I try to extract the month
> mydate$mon
[1] 3
it returns the wrong month. And
2013 Apr 02
2
Create a vector without using an external 'if statement'
Dear R-users,
suppose I have three dataframes like these
df1:
mydate min_temp
31032013 12
01042013 8
02042013 -999
df2:
mydate min_temp
31032013 10
01042013 11
02042013 14
df3:
mydate min_temp
31032013 4
01042013 3
02042013 5
where -999 means that the temperature data is not available (at the moment I cannot change it to NA because I am not the db administrator);
suppose also that oggi is
2011 Oct 27
1
plotting large time series
hello,
I got a problem with plotting large time series, since I want to store
the results in a .PDF file (I want to store several pages of plots). The
PDF files get too large to be handled (> 10MB, one was even 200MB big).
So I wonder, if there would be a possibilty to either
- reduce the file size of the PDF
- change the way the plot is generated to reduce the plot size?
I use:
2009 Aug 28
2
new data.frame summed by date
Hi,
I wonder if someone can suggest how to create a new data.frame Y
from X where X$PL_Pos is summed by each unique X$MyDate. Y should end
up with two (or more) columns Y$MyDate and Y$PL_Sum with its value
being the cumsum of all the values in X for that date. - a 'daily
cumsum'.
Thanks,
Mark
TStoDate = function (TSDate) {
X = strptime(TSDate + 19e6L, "%Y%m%d")
2011 Feb 25
6
preventing repeat in "paste"
Hello!
s<-"start"; e<-"end"
middle<-as.character(c(1,2,3))
I would like to get the following result:
"start 123 end" or "start 1 2 3 end" or "start 1,2,3 end"
How can I avoide this (undesired) result:
paste(s,middle,e,sep=" ")
Thank you!
--
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com
2010 Oct 01
3
Suppressing printing in the function
Hello!
I wrote a function that returns a data frame. Nowhere in the function
do I say print(my.data.frame), but when I run the function - the data
frame is printed on the console.
Is there any way to suppress it?
Thank you!
--
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com
2009 Oct 13
4
replacing period with a space
Dear R-ers!
I have x as a variable in a data frame x.
x<-data.frame(x=c("aa.bb","cc.dd.ee"))
x$x<-as.character(x$x)
x
I am sorry for such a simple question - but how can I replace all
periods in x$x with spaces?
sub('.', ' ', x$x) - removes all letters to the left of each period...
Thanks a lot for your advice!
--
Dimitri Liakhovitski
Ninah.com
2020 Mar 10
2
Fwd: Windows upssched does not work
Hi,
I have problem with upssched on windows. Upssched is not executed. I
have 2 scripts, 1 for notification in upsmon and second for scheduling
in upssched. Monitoring is working fine, script write to log. I'm
using binary windows installer 2.6.5-6 from NUT.
Here are my configs:
--- nut.conf
MODE=netclient
--- upsmon.conf
MONITOR ups_1000 at 192.168.3.95 1 <user> <password> slave
2011 Mar 11
2
insertion of a row between individuals
Can someone help with a fairly simple task?
I have a data set where I would like to insert a 0 time event between
individuals:
what I have:
VAR DATE TIME CONC COVAR
1 NOV2 0.25 10 group1
1 NOV2 0.5 20 group1
1 NOV2 1 5 group1
1 NOV2 2 1 group1
1 NOV2 3 0.1 group1
2 NOV2 0.25 10
2010 Mar 04
4
Analogue to SPSS regression commands ENTER and REMOVE in R?
I am not sure if this question has been asked before - but is there a
procedure in R (in lm or glm?) that is equivalent to ENTER and REMOVE
regression commands in SPSS?
Thanks a lot!
--
Dimitri Liakhovitski
Ninah.com
Dimitri.Liakhovitski at ninah.com
2011 Aug 24
2
data manipulation and summaries with few million rows
I have a data set with about 6 million rows and 50 columns. It is a
mixture of dates, factors, and numerics.
What I am trying to accomplish can be seen with the following
simplified data, which is given as dput output below.
> head(myData)
mydate gender mygroup id
1 2012-03-25 F A 1
2 2005-05-23 F B 2
3 2005-09-08 F B 2
4 2005-12-07 F B 2
2010 Oct 25
3
finding the year of a date
I know that I can use as.yearmon in the package "zoo" to find the year
and the month of a date.
I can use as. yearqtr to find the year and the quarter.
But how can one find just the year of a date?
Thanks a lot!
--
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com