Displaying 20 results from an estimated 30000 matches similar to: "Sorting a date vector"
2009 Jun 18
2
Altering columns
Hi,
Suppose I have following dataset :
mat <- matrix(rnorm(100), 50)
Now I want to put 2nd column in the place of 1st and 1st column in the place
of 2nd. Is there any "quick" way to do that?
Thanks and regards,
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2009 Jul 18
7
Question on qplot
Hi, suppose I have following codes :
library(zoo); library(ggplot2)
dat <- matrix(rnorm(500*2), 500); dat <- zooreg(dat, start =
as.Date("01/01/01", "%m/%d/%y"), frequency=1); plot(dat)
head(dat); month.no <- format(index(dat), "%m"); dat1 <-
cbind(coredata(dat), as.numeric(month.no))
x <- dat1[,1]; y <- dat1[,2]; z <- dat1[,3]
Now I draw a
2008 Nov 20
2
How to Clear all variables stored in current and previous sessions
Is there any function in R to clear values from all variables stored in
current and previous sessions? R site search do not give the desired result
at all, all results are about to clear screen only not variables.
Thanks,
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2009 Mar 19
1
subtract values
Dear R-help
I am using R version 2.6.2. I am trying to subtract specific values from a larger data frame. I feel this should be straightforward, but I am struggling.
I have a dataframe "Bk" as follows:
DateTime cumPrecip
01/01/2008 00:00 348
01/01/2008 01:00 348
01/01/2008 02:00 348
01/01/2008 03:00 347
01/01/2008 04:00 348
01/01/2008 05:00 348
01/01/2008 06:00 349
2009 Nov 13
2
All combination
Please consider the following :
> expand.grid(rep(list(c(1:3)), 3))
Var1 Var2 Var3
1 1 1 1
2 2 1 1
3 3 1 1
4 1 2 1
5 2 2 1
6 3 2 1
7 1 3 1
8 2 3 1
9 3 3 1
10 1 1 2
11 2 1 2
12 3 1 2
13 1 2 2
14 2 2 2
15 3 2 2
16 1 3 2
17 2 3 2
18
2010 Oct 27
2
keep adding elements to the matrix
Hello everyone,
I would like to create a "dynamic" array to keep storing number in it
for (i in c(2:length(final))){
myarray <-final[i]-final[i-1]
myarray2<-2*final[i]
}
At the end I would like to use myarray as the x values of an array
and the myarray2 as the yvalues of the same array.
I tried cbind but it didnot work.
Could you please help me with that?
Best
2011 Aug 30
3
having trouble extracting week from chron object
Running R 2.13.1 on Windows XP.
I would like to get week of the year (1-52) for each date.
library(chron)
dts <- dates(c("02/27/92", "02/27/92", "01/14/92","02/28/92", "02/01/92"))
dts
dts.chron <- as.chron(dts)
dts.chron
class(dts.chron)
# all of these component extractions work:
months(dts.chron)
weekdays(dts.chron)
years(dts.chron)
2009 Oct 22
3
To all of the group
I am pretty much a newbie at CentOS, and Linux on client side,
I would like to help out occasionally by helping the web development crew in
their endeavors and by sorting out some stuff.
such as repairing broken links, or just scanning for content and maybe even
doing a little bit of consulting.
Eric R. Clark
Dynamic Technology Systems
US Phone: (817) 704-4109
US Cell: (817) 706-8856
Email is
2008 Dec 30
5
Downloading data from Economagic
I was trying to dw data from Economagic
[http://www.economagic.com/em-cgi/data.exe/libor/day-ussnon], using
following code :
library(fimport)
dat2 = economagicSeries("libor/day-ussnon", frequency = "daily")
Here I see that data is not complete, downloaded data starts from
"2007-12-31 ", whereas actual data is available from 2001.
secondly, how I convert that data
2010 Oct 19
1
Gini Coefficient
Dear List,
I am unsure if this is specifically a R question or a stats question? I thought i would ask here and if i get no replies it will answer that!
I am trying to calculate Gini coefficients in R, based on a slight modification of the typical equation that i have seen in a paper.
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2003 Aug 12
3
Sorting a dataframe
Undoubtedly a simple question:
I've looked at order() and sort() in the help pages for
R1.7.1. It doesn't appear that these functions are immediately
suited to doing the same thing as
PROC SORT DATA = BLAH;
BY X Y Z;
RUN;
in SAS. I have also checked Frank Harrell's Hmisc library.
Could someone point me in the right direction so I can sort
by the levels of Z within the levels of
2006 Oct 15
3
sort question in a dataset?
Dear friends,
I want to sort a dataset according to one or two variables in the dataset,
i thought sort could do it , but failed.
e.g.
x <- c(2, 9, 18, 3, 2)
y<-c(2,5.6,5,9,8)
z<-c(21,5,5,19,7)
a<-cbind(x,y,z)
a
x y z
[1,] 2 2.0 21
[2,] 9 5.6 5
[3,] 18 5.0 5
[4,] 3 9.0 19
[5,] 2 8.0 7
I want to sort dataset a according to ascending x and descending y, How to
2009 Nov 04
4
unexpected results in comparison (x == y)
Dear readers of the list,
I have a problem a comparison of two data from a vector. The comparison
yields FALSE but should be TRUE. I have checked for mode(), length() and
attributes(). See the following code (R2.10.0):
-----------------------------------------------
# data vector of 66 double data
X =
2011 Aug 11
3
Fwd: Re: what is the fastest way to fetch results which are sorted by timestamp ?
(Forwarded off-list message)
-------- Original Message --------
Subject: Re: [Xapian-discuss] what is the fastest way to fetch results
which are sorted by timestamp ?
Date: Thu, 11 Aug 2011 01:06:36 +0800
From: ??? <panjunyong at gmail.com>
To: Tim Brody <tdb2 at ecs.soton.ac.uk>
On Wed, Aug 10, 2011 at 6:39 PM, Tim Brody <tdb2 at ecs.soton.ac.uk> wrote:
> Hi,
>
> In
2011 Mar 10
1
getting percentiles by factor
Hello,
I'm trying to get percentiles (PERCENTRANK for excel users) by factor in the
following data.frame:
myExample <- data.frame(Ret=seq(-2, 2.5,
by=0.5),PE=seq(10,19),Sectors=rep(c("Financial","Industrial"),5))
myExample <- na.omit(myExample)
Thanks to Patrick I I managed to put together the following lines which does
it for the "Ret" column:
myecdf
2010 Mar 29
4
error in uploading file(help me urgnt)
when i tried to crate an upload file application in rails i am getting
error like this
Template is missing
Missing template app\views\upload\uploadfile.html.erb in view path
app/views
this is ma model
class DataFile < ActiveRecord::Base
def self.save(upload)
name = upload[''datafile''].original_filename
directory = "public/data"
# create the
2009 Jan 16
2
Winsorizing Multiple Variables
Hi All,
I want to take a matrix (or data frame) and winsorize each variable.
So I can, for example, correlate the winsorized variables.
The code below will winsorize a single vector, but when applied to
several vectors, each ends up sorted independently in ascending order
so that a given observation is no longer on the same row for each
vector.
So I need to winsorize the variable but
2008 Dec 02
3
How to solve following equation?
I need to solve a equation like this :
a = b/(1+x) + c/(1+x)^2 + d/(1+x)^3
where a,b,c,d are known constant. Is there any R-way to do that?
Thanks in advance
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2002 Jul 10
2
sorting matrices
how can i sort a matrix by sorting the first colloum in ascending order
and have the values of the other colloums in the relative position to
the sorted values.
thanks for help
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2009 May 11
3
Searching within a ch. string
Hi all, is there any function to find some words in a character-string? For
example suppose the string is : "gdfsa-sdhchc-88", now I want to find
whether this string contains "sdhch". Is there any R function to do that?
Regards,
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