Displaying 20 results from an estimated 1000 matches similar to: "Convert to as.Date"
2009 Mar 25
2
Plot inside For loop
Hi
I am plotting a set of data inside a for loop.
Is it possible to use plot in for loop without redrawing the whole
plot? Am using par(new=TRUE) but that draws on top of the previous plot.
Couldn't find any threads about the topic.
Thanks
Mohan
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2008 Dec 18
3
Parsing unusual date format
Hello,
If I have a character string like
d <- c("1990m3", "1992m8") #March 1990 and Aug 1992
what is the easiest way to convert it into any standard date form; for
example,
d <- c("01/03/1990", "01/08/1992")
I looked at as.Date but it doesn't seem to address my problem as I have an
"m" stuck in the middle of my character string
2009 Feb 25
1
How to get JRI to work from my NetBeans
Hi,
I need your help. I have downloaded a precompiled JRI as part of rJava. I
have included rJava as part of my R package libraries.
Now I need to be able to work with some R functions from my Java apps. I'm
using NetBeans on Windows.
I have followed some instructions from http://www.rforge.net/JRI/
but i keep on getting errors when compiling my Java app as follows:
run:
Cannot find JRI
2009 Jan 05
3
if statement
Hi,
How do I check for two conditions in an if loop? I want to check if a value
lies between 2 other values.
For example,
A <- ts(rnorm(120), freq=12, start=c(1992,8))
X <- 0.5
Y <- 0.8
I would like to create a new vector C for which C[i] is 0 if A[i] lies in
between X and Y.
Would be grateful for any help. Sorry for asking such an R-newbie question!
Shruthi
--
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2009 Apr 02
4
Deleting rows based on identity variable
I have created this data frame to help illustrate my problem.
id<-c(rep(1,5),rep(2,5),rep(3,5),rep(4,5),rep(5,5))
x<-rep((seq(1:5)),5)
y<-c(0, 0.1, 0.5, 0.4, 0.2, 0, 0.1, 0.5, 0.4, 0.12, 0, 0.1, 0.5, 0.55, 0.2, 0, 0.1, 0.5, 0.3, 0.2, 0, 0.1, 0.6, 0.4, 0.1)
d1<-cbind(id,x,y)
I would like to delete all rows where id=4, however, when I tried the command
d2=d1[-c(id==4),]
and looked
2009 Feb 25
2
reshape from wide to long
Hi,I would like to reshape the following "wide" data set to "long" form. I
would appreciate help with the correct code for "reshape". I tried a few
unsuccessfully.
Thanks.
Chetty
__________________________________________________
dat.1
Grp X0 X3 X6 X12 X25
X501 C 0.5326517 0.6930942 0.9403883 1.157571
2009 Jan 20
2
Confidence intervals in ccf()
Hi,
I have been running the ccf() function to find cross-correlations of time
series across various lags. When I give the option of plot=TRUE, I get a
plot that gives me 95% confidence interval cut-offs (based on sample
covariances) for my cross-correlations at each lag. This gives me a sense of
whether my cross-correlations are statistically significant or not.
However, I am unable to get R to
2009 Feb 03
1
Using getSymbols
Hi,
How can one ask getSymbols to obtain data within a specified time interval?
For example, if I am downloading US PPI data:
usppi <- as.zoo(getSymbols("PPIACO", src="FRED", verbose=TRUE,
auto.assign=FALSE))
How do I ask getSymbols to truncate starting from Jan-1970 until present? I
looked up the help file but couldn't find anything.
Another newbie question, can I
2009 Mar 10
1
HAC corrected standard errors
Hi,
I have a simple linear regression for which I want to obtain HAC corrected
standard errors, since I have significant serial/auto correlation in my
residuals, and also potential heteroskedasticity.
Would anyone be able to direct me to the function that implements this in R?
It's a basic question and I'm sure I'm missing something obvious here. I
looked up this post:
2008 Dec 18
1
For and if confusion
I have two date objects
X <- c("01-03-1993", "01-05-1997") #Mar 1993 and May 1997
Y <- c("01-02-1995", "01-08-1999") #Feb 1995 and Aug 1999
and a time series object
A <- ts(rnorm(120), freq=12, start=c(1992,8)) #Aug 1992 to Aug 2002
I want to create a binary (0-1) vector B that is of length 1:(A).
B should have value 1 for the time periods
2009 Feb 12
2
Problem with loading rJava in R
Hello.
I am trying to load the rJava package in R-2.7.2 (Windows XP 64-bit RGui)
and get the following error message even though the mentioned .dll file is
located at the directory listed in the error message. I have tried to
uninstall and reinstall the package but that does not resolve the problem.
Then uninstallation and re-installation of R did not resolve the issue
either. Any suggestions are
2009 Mar 25
4
Manual sort in a for loop
Dear all,
I am trying to manually re-sort rows in a number of tables. The rows aren't sorted on any particular values but are simply ordered by user choice (as shown by the row numbers in the code). I have been able to carry out each re-arrangement without the use of the 'for' loop, but cannot seem to successfully execute the statements when incorporated into the loop. The code I have
2009 Feb 27
5
Filtering a dataset's columns by another dataset's column names
Hello all,
I hope some of you can come to my rescue, yet again.
I have two genetic datasets, and I want one of the datasets to have only the columns that are in common with the other dataset.
Here is a toy example (my real datasets have hundreds of columns):
Dataset 1:
Individual SNP1 SNP2 SNP3 SNP4 SNP5
1 A G T C A
2 T C A G T
3 A C T
2009 Mar 26
4
Reading in files with variable parts to names
Dear all,
I'm trying to read in a whole directory of files which have two variable parts to the file name: year and month. E.g. comp198604.asc represents April of 1986 - 'comp' is fixed in each case. Years range between 1986 to 1995 and months are between 1 and 12.
Just to be clear, there are 12 files associated with each year: e.g. comp198601, comp198602, ... comp198612 through to
2009 Feb 09
11
Choosing a random number between x and y
Hi,
Ive been trying to find a function that will allow me to pull out a number
between a minimum and maximum threshold.
I want a random decimal number between, for example, 0 and 0.5 or 0 and 0.7.
I've been searching everywhere for a function that will allow me to do this
in R, but I have yet to be successful. Any help would be much appreciated.
Thanks in advance
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2009 Feb 02
1
Beveridge Nelson Decomposition
Hi,
Would anyone know if it is possible to run a Beveridge Nelson decomposition
of a univariate time series object in R? I searched in the help files but
didn't come across any potential methods.
Thanks very much,
Shruthi
--
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2008 Jan 10
5
Extracting last time value
I have a dataframe as follows:
Date time value
20110620 11:18:00 7
20110620 11:39:00 9
20110621 11:41:00 8
20110621 11:40:00 6
20110622 14:05:00 8
20110622 14:06:00 6
For every date, I want to extract the row that has the greatest time.
Therefore, ending up like:
20110620 11:39:00 9
20110621 11:41:00 8
20110622 14:07:00 6
I am using for loops (for every date, find largest time value) to do
2007 Dec 26
2
Rbind-ing a list into one item
Hi,
I am doing the following:
1. I have a list of files.. Files1=list.files("some
directory",pattern="some pattern")
2. I define a list as res=vector("list", length(files1))
3. I read all the files into this list: res=lapply(files1, read.csv)
I now want to rowbind all the items in the list into one big mass (all
files have same number of columns). I tried
2007 Dec 19
3
Aggregating by a grouping
Suppose I have:
Book Value
A 10
B 11
C 9
D 8
A 12
C 4
D 5
B 7
I want to summarize above not by Book but by groupings of Books as in
(below)
I have a list ... basic_map <- list(c("A",B"),c("C,D"))
Big_names <- c("A1", "A2")
Names(basic_map) <- big_names
So I want to get :
A1 40
A2 26
How do I use tapply AND the list to get my
2008 Jan 08
1
Error with rbind and zoo
Hi all:
I have a directory of files as in -------------> bunchafiles <-
list.files(path="/data/2.3/2006", pattern="returns",
full.names=T,recursive=T) .... Each file is a bunch of returns for a
particular date (unique). There are like 252 files or so.
With a custom function myread (below), I define a vector ----- res <-