Displaying 20 results from an estimated 2000 matches similar to: "regular expression question"
2008 May 01
2
regular expression question
I have strings of the form
TICKER.GGG.XXXXXX.dat
but GGG is not always three characters so I can't use substr to pull it
out of the string.
Could someone tell me how to use sub to pull out the GGG but more
generally the string between the dot after the R in TICKER and the next
dot. I still don't have a very good understanding of regular
expressions but I'm trying to get that
2009 Mar 03
4
regular expression question
can someone show me how to use a regular expression to break the string
at the bottom up into its three components :
(-0.791,-0.263]
(-38,-1.24]
(0.96,2.43]
I tried to use strplit because of my regexpitis ( it's not curable. i've
been to many doctors all over NYC. they tell me there's no cure ) but
it doesn't work because there also dots inside the brackets. Thanks.
2008 Sep 23
4
perl expression question
If I have the string below. does someone know a regular expression to
just get the "BLC.NYSE". I bought the O'Reilley
book and read it when I can and I study the solutions on the list but
I'm still not self sufficient with these things. Thanks.
stock<-"/opt/limsrv/mark/research/equity/projects/testDL/stock_data/fhdb/US/BLC.NYSE"
2011 Nov 07
1
close but no cigar
Hi Everyone: It turns out that there's still a small ( I hope ) problem.
I'm close but that only counts in horse shoes and hand grenades.
Here's my problem: When trying to load a package that I am writing, the
load is looking for the packageDescription function in the utils package
but not finding the utils package. I looked on cran and utils is not there
which makes me think that it
2011 Nov 06
2
still working on building R from source
Hi Everyone: Gavin's been so generous and patient that I figured I'd give
him a break and send this snag to the list. When I do get this working, I
will send an "How to build R from the tarball " instructions message to
this list for posterity's sake ( and myself and anyone else who doesn't
know how to build R from the tarball ).
So, here's my latest snag: Gavin
2009 Mar 31
1
error when going through Alan Lenarcic's package Tutorial
Hi Everyone: I've been going through Alan Lenarcic's package tutorial but
when I did
R CMD SHLIB Xdemo.cc Xdemo_main.cc -o Xdemo.dll
I got the following error:
XDemo_res.rc:15:38: warning: missing terminating " character
XDemo_res.rc:23:34: warning: missing terminating ' character
c:\mark\research\Rtools\MinGW\bin\windres.exe: XDemo_res.rc:16: syntax error
2009 Aug 05
4
A question regarding R scoping
I have a question related to scoping. Suppose we have 2 functions:
f1 = function(i){i = 1}
f2 = function(n){
i = length(n)
f1(i)
}
In other words, I would like i=1 regardless of n. Is this possible without having f1 in the body of f2? Thanks in advance!
2008 Aug 12
2
perl expression question
I have a string such as
fileName<-"Agg.20.20.20-all-01".
All I want to do is pull the "20.20.20" and the "all" as strings.
Obviously, they aren't always those values.
The "20.20.20" can be "30.30.30" but it's always after the . which is
next to the second g in Agg and it's always the same length. The all
might not always be
2009 Nov 13
4
processing log file
Dear all, I'm trying to process a log file which logs the date, the username and the computer number accessed. The table looks like this:
>table.users
Date UserName Machine
1 2008-11-25 John 641
2 2008-11-25 Clive 611
3 2008-11-25 Jeremy 641
4 2008-11-25 Walt 722
5 2008-11-25 Tony 645
6 2008-11-26 Tony 645
7 2008-11-26
2003 Aug 13
2
group membership limitations and Linux
Hi all,
I was hoping someone here would be willing to clear up some confusion
we're having about group membership limits and linux.
While trying to use a file server solution in an AD environment using
OpenLDAP / sasl / Samba 2.2.x, we ran into the issue that when trying
to import/re-create group membership, we reach a limit at 32 groups.
It is my understanding that this is a limitation
2006 Jun 16
2
scatterplot but a little tricky
i have two vectors of numbers x and y and of course i
can do the standard scatterplot plot(x,y)
and it looks fine. But, I was hoping there was a way to
do the scatterplot so that each point plotted is a number
where the number represents the index in the dataset.
so, if it was x[3] and y[3], then the point would be a 3
or if it was x[4] and y[4], then the point would be a 4 etc.
i doubt this is
2006 Jul 05
2
apologes if you already saw this :efficiency question
hi everyone : i'm not sure if my previous mail about
this got sent. i was typing and
erroneosuyl hit a button and lost what i was typing.
anyway, i have the code below ( it works ) in which i run through the rows of a dataframe, taking out the first two
fields which are characters strings ( with some extra spacing so
i yuse gsub) and appending these character strings to a list so that i can
2006 Jul 06
2
[Fwd: as.data.frame question]
>From: markleeds at verizon.net
>Date: Thu Jul 06 13:16:42 CDT 2006
>To: markleeds at verizon.net
>Subject: as.data.frame question
>hi all : as a result of an lapply command,
>i get the following output.
>
>
>$AAA
> 000106 000107 000108
> 5.5 6.5 3.0
>
>$BBB
> 000106 000107 000108
> 4 5 6
>
>$CCC
2009 Jun 01
1
Fwd: subset dataframe/list
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2008 Jul 05
3
trying to superimpose a line plot onto a histogram
Hello,
I'm trying to superimpose a line plot onto a histogram but I'm not having
any luck. I've attached the dataset. What I did was:
> hist(data,freq=F)
Now I'm trying to superimpose the following points with a line connecting
them onto the histogram:
x y
100 0.535665393824959
200 0.212744329736556
300 0.0844933242968584
400 0.0335572838043417
500
2009 Apr 01
1
problems with package tutorial
Hi: Here's my revised attempt at explaining my problem. Hopefully it won't
get sent out weirdly like it did earlier. ? The link to what I'm trying to
follow is
http://www.stat.columbia.edu/~gelman/stuff_for_blog/AlanRPackageTutorial.pdf
? I've been going through the tutorial but when I got to page 9 and did
R CMD SHLIB Xdemo.cc Xdemo_main.cc -o Xdemo.dll
I got
2009 Feb 11
2
error in my previous message
i'm sorry. i had an error in my previous code because i left out a
letter in the rownames.
while fixing that, i also found a solution. so i'm sorry for the
confusion.
below is my fix.
temp2 <- matrix(rnorm(10),nc=1,nrow=10)
rownames(temp2) <-
2009 Feb 05
4
eval and as.name
I'm sure there is a more general way to ask this question but how do
you use the elements of a character vector as names of objects in an
expression?
For example, say you have:
a = c(1,3,5,7)
b = c(2,4,6,8)
n=c("a","b")
and you want to use the names a and b in a function (e.g. sum)
sum(eval(as.name(n[1])),eval(as.name(n[2])))
works but
what is a simpler way to
2006 Jun 20
2
strange use of sapply
I've tried and give up. I have a matrix of say 200 columns and 400 rows.
For each odd ( or even i suppose if i wanted to )column,
I want to know the number of rows in which the value is greater than zero.
So, I did sapply(tempMatrix,2,function(x) sum( x > 0 ))
this almost works but i don't know how to tell
it to only do the odd columns. my guess is , like everything else
in R, this
2009 Aug 05
2
acf Significance
Hi List,
I'm trying to calculate the autocorrelation coefficients for a time
series using acf at various lags. This is working well, and I can get
the coefficients without any trouble. However, I don't seem to be able
to obtain the significance of these coefficients from the returned acf
object, largely because I don't know where I might find them.
It's clear that the acf