Displaying 20 results from an estimated 30000 matches similar to: "'Split' character"
2007 Nov 24
1
'Split' chracter
Dear R-users,
The following code splits a very simple dataframe into a list, each
element of the list being one line of the dataframe. You will see that
the split function names each element of the list by using uses the
content of a and b and merging them with a "." character. Is there a way
to customize this character?
a<-1:10
b<-21:30
mydata<-data.frame(a,b)
2008 Aug 22
1
How to handle "~" character after csv importation
Dear R users,
I have to import some csv files in which column headers contain the
character "~". Following the following import call, the character seems
to be replaced by dots in the column names of my data frame. Plus, I
cannot query names(mydata) to find the column index which header should
contain "~" or "."
> mydata <-
2007 Aug 06
3
Error in using nlevels in apply function
Dear R users,
I am currently trying to create my first personnal function and use it
with the apply function. The purpose of this function is to create a
vector summarizing the number of levels in a given selection of
data.frame columns.
I tried to transpose the indexation method used by the nlevels function
but it doesn't seem to work. I did not find anything uesful in the
archives so
2008 Dec 03
3
Strplit code
Dear R-users,
The strsplit function does not exist in S-plus and I would like to use it. How
could I reproduce the function in Splus or access to its source code?
Thank you in advance,
Sebastien
2007 Sep 02
2
Different behavior of mtext
Dear R Users,
I am quite surprised to see that mtext gives different results when it
is used with 'pairs' and with "plot'. In the two following codes, it
seems that the 'at' argument in mtext doesn't consider the same unit system.
I would appreciate your comments on this issue.
Sebastien
##### Pairs
mydata<-data.frame(x=1:10,y=1:10)
par(cex.main=1,
2007 Aug 28
6
Factor levels
Dear R-users,
I have found this not-so-recent post in the archives -
http://tolstoy.newcastle.edu.au/R/devel/00a/0291.html - while I was
looking for a particular way to reorder factor levels. The question
addressed by the author was to know if the read.table function could be
modified to order the levels of newly created factors "according to the
order that they appear in the data
2007 Jun 21
2
Overlaying lattice graphs (continued)
Dear R Users,
I recently posted an email on this list about the use of data.frame and
overlaying multiple plots. Deepayan kindly indicated to me the
panel.superposition command which worked perfectly in the context of the
example I gave.
I'd like to go a little bit further on this topic using a more complex
dataset structure (actually the one I want to work on).
>mydata
Plot
2007 Jun 11
2
Overlaying lattice graphs
Hello
I apologize in advance if this question has already be posted on the
list, although I could not find a relevant thread in the archives.
I would like to overlay xyplots using different datasets for each plot.
I typically work on the following data.frame (mydata) structure
>mydata
Drug Time Observed Predicted
1 A 0.05 10
2007 Aug 01
1
Problem to remove loops in a routine
Dear R-users,
I have written the following code to generate some trellis plots. It
works perfectly fine except that it is quite slow when it is apply to my
typical datasets (over several thousands of lines). I believe the
problem comes from the loops I am using to subset my data.frame. I read
in the archives that the tapply function is often more efficient than a
loop in R. Unfortunately ,
2007 Aug 11
1
Replace NAs in dataframe: what am I doing wrong
Dear R-users,
My script imports a dataset from a csv file, in which missing values are
represented by ".". This importation is done into a dataframe using the
read.table function with na.strings = "." Then I want to replace the
NAs in the first column of the dataframe by "Missing data". I am using
the following code to do so :
2011 Jun 15
2
Count occurances in integers (or strings)
Hi,
I have a dataframe column from which I want to calculate the number of
1's in each entry. Some column values could, for example, be
"0001001000" and "11110000111".
To get the number of occurrences from a string I use this:
sum(unlist(strsplit(mydata[,"my_column"], "")) == "1")
However, as my data is not in string form.. How do I convert
2009 Aug 01
3
Transparency and trellis device
Dear R-users,
I am trying to produce trellis (png, or jpeg) graphs with transparent background, but I cannot manage to make that happen. I tried to play around with themes but to no avail. Any advise on the following example will be greatly appreciated:
Thank you
Sebastien
####
library(lattice)
df <- data.frame(a=rep(1:4,4), b=rep(1:4,4), c=rep(1:4,each=4))
settings <- standard.theme()
2007 Jun 24
2
matlab/gauss code in R
Hi all!
I would like to import a matlab or gauss code to R.
Could you help me?
Bye,
Sebasti?n.
2007/6/23, r-help-request en stat.math.ethz.ch <r-help-request en stat.math.ethz.ch>:
> Send R-help mailing list submissions to
> r-help en stat.math.ethz.ch
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2011 Dec 06
2
How to automate the detection of break points for use in cut
Dear R-users,
I would like to know if there is a function (in base R or the extension
packages) that would automatically detect the break points in a vector x
for later use in the cut function. The idea is to determine the boundaries
of the n intervals (n>=1) delimiting clusters of data points which could be
considered "reasonably" close, given a numerical vector x with unknown
2009 Aug 19
4
Basic question: Reading in multiple choice question responses to a single column in data frame
I'm using read.delim to successfully read in tab delimited data, but some
columns' values are comma seperated, reflecting the fact that user chose a
few answers on a multi-select question. I understand that each answer is
its own category and so could be represented as a seperate column in the
data set, but I'd like the option of reading in the data column, and
converting it to a
2008 Dec 08
2
Scan a folder for a given type of files
Dear R-users,
I have found on the list several posts addressing the issue of getting data for
a list of defined files. However, I found nothing about scanning a given folder
and retrieving the list of, let's say, .txt files (I probably used the wrong
keywords). Could someone tell me which posts or function help I should look at?
Thanks in advance
Sebastien
2011 Aug 31
3
How to modify the dot-dot-dot argument using level names instead of position
Dear R-users,
In the R internals manual, it is said that one can extract the
elements of the dot-dot-dot argument using the special symbols ..1 or
..2. It seems to work just fine but I was wondering if there is a way
one can extract or modify the content of the dot-dot-dot argument
using a level name instead of its position?
For instance, assuming that list(...) returns:
$a
[1] 1 2 3 4 5
2010 Feb 24
1
Adjust lattice graph axis label on final page
Dear R-users,
I was wondering if there was a way to adjust the placement of the axis
titles for the last page of a multi-page lattice plot (see example
below). Depending on the total number of panels, the placement of these
titles might look strange on the last page, if the layout is not
adjusted (e.g. in some template code).
Any thought on this issue would be welcome.
Sebastien
2006 Jan 16
3
new comer's question
I am new to R. I try to search the web but could not find the answer so I
post it here asking for help.
I have a csv file looks like this: (between two ==== lines)
===========================
Machine Name,"Resource, Type","Resource, Sub-type","Resource,
Instance",Date,,Data ->,,,,,,
,0.041666667,,,,,,,,,,,
Time (HH:MM)
2009 Apr 10
4
split a character variable into several character variable by a character
Dear Mao Jianfeng,
"r-help-owner" is not the place for help, but:
r-help at r-project.org
(CC-ed here)
In any case, strsplit() does the job, i.e.:
> unlist(strsplit("BCPy01-01", "-"))
[1] "BCPy01" "01"
You can work with the whole variable, like:
splitpop <- strsplit(df1$popcode, "-")
then access the first part with
>