Displaying 20 results from an estimated 5000 matches similar to: "Fancy Page layout"
2010 Jun 01
4
Plot multiple columns
I'm running a long MCMC chain that is generating samples for 22 variables.
I have each run of the chain as a row in a matrix.
So: Chain[,1] is the column with all the samples for variable one.
Chain[,2] is the column with all the samples for variable 2, etc.
I'd like to fit all 22 on a single page to print a nice summary. It is
OK if the graphs are small, I just need to show the
2011 Aug 20
1
Raw epoch time from XTS
Hi,
I have a very large data set stored as an xts object.
xts is very nice about showing row labels as "human readable" dates and times.
I want the actual epoch values that are stored internally. The only way I can find to access them is one-at-a-time using the internal function: xcoredata()
Calling this in an entire column, the "R" way doesn't work. It will only
2011 Mar 31
3
Create Variable names dynamically
Hi,
I want to create variable names from within my code, but can't find any documentation for this.
An example is probably the best way to illustrate. I am reading data in from a file, doing a bunch of stuff, and want to generate variables with my output. (I could make a "list of lists" and name all the elements, but I really want separate variables.)
#################
#This is
2009 Sep 11
4
R on Multi Core
Hi,
Our discussions about 64 bit R has led me to another thought.
I have a nice dual core 3.0 chip inside my Linux Box (Running Fedora 11.)
Is there a version of R that would take advantage of BOTH cores??
(Watching my system performance meter now is interesting, Running R will
hold a single core at 100% perfectly, but the other core sites idle.)
Thanks!
--
Noah
2012 Jun 11
3
Decision Trees or Markov Models for Cost Effectiveness
Hello,
I was just assigned to perform a cost effectiveness study in healthcare. We are studying the cost effectiveness of a proposed diagnostic vs. current screening procedures.
One of the team members suggest a commercial software package called "TreeAge Pro". Looking at the description, it appears to be a nice GUI to some very simple models that could be easily constructed in R.
2012 Oct 14
4
Date Math
Hello,
I have a time series object (xts) that I iterate over in a loop. Works fine.
My challenge is that I want to be able to reference other entries in the series by math. i.e. For today's observation, what were the last 5 observations? If indexed numerically, it is trivial, but I can figure out how to do this with dates.
This is slightly more difficult as there may not be an
2012 Oct 09
4
Convert COLON separated format
I have a bunch of data sets that were created for the libsvm tool. They are in "colon separated sparse format".
i.e.
1 5:1 27:3 345:10
Is a row with the label of "1" and only has values in columns 5, 27, and 345.
I want to read these into a data.frame in R.
Is there a simple way to do this?
--
Noah Silverman, M.S.
UCLA Department of Statistics
8117 Math Sciences
2005 Mar 25
5
Two companies - One Asterisk???
We have two small business that run out of our office. One business has
3 phone lines, and the other has only one.
In a perfect world, Asterisk would indicate WHICH line (or group) the
outsider caller called, so that we would know which way to answer the
phone. The incoming calls would go through a voice mail menu first -
different for each company. (Press one for sales, two for
2012 May 18
4
Menus - best practices?
Hello,
I need to design a fairly simple front-end for someone to use an R script system that I've built. My thought was to just use the text based menus available in the base R package, perhaps in some kind of loop.
How have other people done this? Any "best practices" that you can recommend?
Thanks!
--
Noah Silverman
UCLA Department of Statistics
8117 Math Sciences Building
2011 Oct 16
2
Use of ICA for sound
Hi,
I'm looking at the "cocktail party" classic problem.
I can see how to use ICA to separate the components. But, How do I then create new wav files of the separated sounds so that they can be played?
Thanks
--
Noah Silverman
UCLA Department of Statistics
8208 Math Sciences Building
Los Angeles, CA 90095
[[alternative HTML version deleted]]
2009 Aug 30
3
Sapply
Hi,
I need a bit of guidance with the sapply function. I've read the help
page, but am still a bit unsure how to use it.
I have a large data frame with about 100 columns and 30,000 rows. One
of the columns is "group" of which there are about 2,000 distinct "groups".
I want to normalize (sum to 1) one of my variables per-group.
Normally, I would just write a huge
2009 Oct 16
2
Different way of scaling data
Hi,
I have a data.frame that I need to scale.
I've been using the scale function and it works nicely.
Some of the libraries I'm testing won't accept negative values for data,
so I need to find a way to scale the data from 0 to 1
Any ideas?
Thans!
2011 Sep 02
2
Avoiding for Loop for moving average
Hello,
I need to calculate a moving average and an exponentially weighted moving average over a fairly large data set (500K rows).
Doing this in a for loop works nicely, but is slow.
ewma <- data$col[1]
N <- dim(data)[1]
for(i in 2:N){
data$ewma <- alpha * data$ewma[i-1] + (1-alpha) * data$value[i]
}
Since the moving average "accumulates" as we move through the data,
2009 Sep 03
2
Easy way to get top 2 items from vector
Hi,
I use the max function often to find the top value from a matrix or
column of a data.frame.
Now I'm looking to find the top 2 (or three) values from my data.
I know that I could sort the list and then access the first two items,
but that seems like the "long way". Is there some way to access "max_2"
or similar?
Thanks!
--
Noah
2009 Aug 12
5
Nominal variables in SVM?
Hi,
The answers to my previous question about nominal variables has lead me
to a more important question.
What is the "best practice" way to feed nominal variable to an SVM.
For example:
color = ("red, "blue", "green")
I could translate that into an index so I wind up with
color= (1,2,3)
But my concern is that the SVM will now think that the values are
2012 Feb 13
4
Reading in csv with footer
Hi,
I have a CSV file that is formatted well, except that the last line is a "summary" not is CSV format.
Toy example:
label_1, label_2, label_3
1,2,3
3,2,4
2,3,4
Total Rows: 3
When I try to import this into R with: d <- read.table("foo.csv", header=T, sep=",")
It fails to import properly because of the last line.
Currently, I have a shell script that strips
2012 May 18
2
Failure building any package
Hello,
I'm attempting to build a package using R 2.15.0 on OS X
I am getting a generic failure when performing a cran type check on the package. Even with a very simple test package, it still fails int he same place.
Example:
In R:
rm(list=ls())
foo <- function(x){print(x)}
package.skeleton(name="foo")
Then, at the command line:
R CMD build foo
R CMD check --as-cran
2009 Aug 26
6
Managing output
Hi,
Is there a way to build up a vector, item by item. In perl, we can
"push" an item onto an array. How can we can do this in R?
I have a loop that generates values as it goes. I want to end up with a
vector of all the loop results.
In perl it woud be:
for(item in list){
result <- 2*item^2 (Or whatever formula, this is just a pseudo example)
Push(@result_list,
2005 Mar 25
2
Re: Two companies - One Asterisk
Dean -
> if you are having these troubles and everyone keeps advising you to use
> asterisk@home why aren't you doing this?
Not to be rude, but I believe you are the only one who suggested he use
asterisk@home. asterisk@home is a great (actually stupendous) product
for those that want to have a PBX with a GUI up and running within a
few minutes. It does not, however, force users
2010 Jul 09
3
accessing return variables from a function
Hi,
I am trying to figure out a "short" way to access two values output from
the sort function.
>x <- c(3,4,3,6,78,3,1,2)
>sort(x, index.return=T)
$x
[1] 1 2 3 3 3 4 6 78
$ix
[1] 7 8 1 3 6 2 4 5
It would be great to do something like this (doesn't work.):
c(y, indexes) <- sort(x, index.return=T)
But that doesn't work.
I CAN grab the output of sort in a