Displaying 20 results from an estimated 500 matches similar to: "mode(x) <- "double""
2009 Jun 29
2
re moving value from a vector
Hallo,
I have a vector of several iterations and I have to remove /filter out all
the values < than 10,
how can I do this?
Thanks a lot
Alessandra
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2009 May 09
1
for loop
Hi,
I need your help.
I have a vector of numbers reflecting the switch in the perception of a
figure. For a certain period I have positive numbers (which reflect the
perception A) then the perception changes and I have negative numbers
(perception B), and so on for 40000 iterations. I need to take the rate of
this switch for my analysis. Namely, I need a new vector with numbers which
reflect how
2009 Jul 03
3
Histogram
Hallo,
How can I have the control of the width of each bin in the histogram?
I would like to plot my data modifying the number and the width of the bins.
Is there a good pdf or manual where i can learn to use the plot/hist in R
very well?
I find the help not always clear
Thanks a lot
Ale
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2012 Mar 13
2
beginner's loop issue
Dear All,
I hope you don't mind helping me with this small issue. I haven't been using
R in years and I'm trying to fill in a matrix
with the output of a function (I'm probably using the Matlab logic here and
it's not working).
Here is my code:
for (i in 1:length(input)){
out[i,1:3] <- MyFunction(input[i,1],input[i,2], input[i,3])
out[i,4:6] <-
2008 Feb 04
2
maybe a bug in the system.time() function? (PR#10696)
Full_Name: Alessandra Iacobucci
Version: 2.5.1
OS: Mac OS X 10.4.11
Submission from: (NULL) (193.48.71.92)
Hi,
I am making some intensive simulations for the testing of a Population Monte
Carlo algorithm. This involves also a study of the CPU times in two different
case.
What I am trying to measure is the "real" CPU time, the one which is independent
on the %CPU.
I'm using the
2009 Jul 07
2
rle
Hallo,
I have an other problem, I have this vector signData with an alternation of
1 and -1 that corrispond to the duration of two different percepts. I
extracted the durations like this:
signData<- scan("dataTR10.txt")
dur<-rle(signData)$length
Now I would like to extract only the positive duration, e.g.
signData <- c(1,1,1,1,-1,-1,-1,1,1,-1,-1)
posduration <- c(4,2)
I
2007 Oct 08
5
Specify plot size
Hello,
I have another (possibly easy) question:
How to specify the size of a plot? When I draw a plot, I can freely change
the size of the window, which is nice for single plots to find the best
height/width ratio, but as I need a lot of plots in my work, I want to look
them all the same, so I need to specify the size in advance.
Thanks for help,
Christoph
2008 Sep 08
7
Question about multiple regression
Dear R-list,
maybe some of you could point me in the right direction:
Are you aware of any FREE Fortran or Java libraries/actual pieces of
code that are VERY efficient (time-wise) in running the regular linear
least-squares multiple regression?
More specifically, I have to run small regression models (between 1
and 15 predictors) on samples of up to N=700 but thousands and
thousands of them.
I
2009 Mar 02
2
R-code help for filtering with for loop
Dear Sir / Madam,
I am new for R coding. Kindly help me out in sorting out the following problem.
There are 50 rows with six coloumns(you could see in the attached .txt file). I
wish to go for filtering this 50 rows for any one of the six coloumns
satisfying the value >= 64.
I need to have a final table with rows having >= 64 value in any one of the six
coloumns and the rest could be
2008 Jun 10
4
Hello
Hello,
I am facing a problem in drawing heat map using R.
I have a 70X3 matrix and I want to draw a heat map with 1 coloumn on X axis
another on Y axis and want to show the value of 3rd coloumn using heat
colours.
Could you please help me with this .
Thank you .
Regards,
Sumit
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2009 Apr 23
4
rbind data frames stored in a list
Hello everyone!
I have a list X with 3 elements, each of which is a data frame, for example:
a<-data.frame(a=1,b=2,c=3)
b<-data.frame(a=c(4,7),b=c(5,8),c=c(6,9))
c<-data.frame(a=c(10,13,16),b=c(11,14,17),c=c(12,15,18))
X<-list()
X[[1]]<-a
X[[2]]<-b
X[[3]]<-c
(X)
How can I most effectively transform X into a data frame with columns
a, b, and c?
I would love to find a generic
2007 Sep 14
1
Print to file
Hello list I'M new
I need help about print to file
How i can Print more table in a file (in append)
using xtable and print functions?
Tanks
Alessandra
2005 Mar 22
2
bottlenecks
Hi
I must to estimate the* performance.
I am try to understand which can be the eventual bottlenecks.
Have you some suggestion?
Can you to signal to me some problems?
Thanks
Alessandra
2009 Apr 28
4
Producing customized tickmarks when producing a graph using "curve"
Hello!
I am using function "curve" to create a line graph.
I was wondering, if it's possible to "turn off" the default tick marks
and introduce those tick marks in specific locations.
For example, currently in my X axis tick marks are (automatically) at
10, 11, 12, 13 but I want them to be in 5 specific locations, like
9.89, 10.34, etc.
Any hint would be greatly
2009 Dec 03
3
Scraping a web page
I would like to be able to submit a list of URLs of various webpages and extract the "content" i.e. not the mark-up of those pages. I can find plenty of examples in the XML library of extracting links from pages but I cannot seem to find a way to extract the text. Any help would be greatly appreciated - I will not know the structure of the URLs I would submit in advance. Any
2005 Mar 25
2
tapply and NA value
Hi,
I'm writing for a little help.
I have a dataframe with same NA value and I'd like to obtain the means of the
value of a coloumn grouped by the levels of a factor coloumn of the datframe.
I'm using the function "tapply" but I see that if only a NA value is present
the result is NA.
There is an option to have the correct result or I must use an other function?
Thanks of
2010 Dec 29
3
Windows editor suggestions - autosave
I am looking for advice on an editor to use with R (windows) that has an autosave feature. I typically write scripts using the RGui (and tried TinnR yesterday) but I am having continuing problems with BSODs (non R related) and have in the past have had issues with R crashes and would really like a system that does not require me to remember to hit the save button on my script every 10 minutes so
2011 May 19
2
Anyone successfully install Rgraphviz on windows with R 2.13?
I have been trying to get Rgraphviz to work (I know it is from Bioconductor) unsuccessfully. Since I have no experience with Bioconductor I thought I would ask here if anyone has advice. I have installed Graphviz 2.20.3 as is recommended on the Bioconductor site but basically R cannot seem to find the needed dll files. So, even though I have added the appropriate directories to the system path R
2009 Mar 26
2
Analogy for %in% for the whole columns (rather than individual values)
Hello!
I have a matrix a with 2 variables (see below) that contain character strings.
I need to create a 3rd variable that contains True if the value in
column x is equal to the value in column y. The code below does it.
a<-data.frame(x=c("john", "mary", "mary",
"john"),y=c("mary","mary","john","john"))
2010 Jun 07
2
as.integer
Hi,
Is there a way to recursively change the variables imported with
read.table(..) - and then attached with attach(..) - from as.factor to
as.integer?
I have about 9 variables that are now recognized as factors but I need to do
statistics on them so I need to change them in as.integer. It works, but I
wonder if there is a way to to this for all the variables in one go.
Thanks a lot for your