Displaying 20 results from an estimated 4000 matches similar to: "combn with factors"
2009 Jun 26
2
Indexing a list with a list
Dear list,
I have two lists: one with data and one with TRUE/FALSE values for data
I want to further analyze (see example below). I have been able to use a
for loop to extract the data that I want to keep, but think that there
probably exists a way to do it without a loop. Any ideas?
#sample data
set.seed(100)
example = list(letters[1:10], letters[1:10], letters[1:10])
ind =
2011 May 13
1
period in scale parameter of prcomp
Hi all,
Looking at the help file for prcomp and the code in
stats:::prcomp.default, the scale parameter for the default S3 method
has a trailing period: it written as
scale.
I assume there is a reason for it (backwards compatibility with S was
suggested) but I thought I'd ask.
Thanks,
Greg
--
Greg Hirson
ghirson at ucdavis.edu
Graduate Student
Agricultural and Environmental Chemistry
2010 Jan 05
2
Fast nested List->data.frame
I have very large data sets given in a format similar to d below. Converting
these to a data frame is a bottleneck in my application. My fastest version
is given below, but it look clumsy to me.
Any ideas?
Dieter
# -----------------------
len = 100000
d = replicate(len, list(pH = 3,marker = TRUE,position = "A"),FALSE)
# Data are given as d
# preallocate vectors
pH =rep(0,len)
marker
2009 Jul 08
2
Simple monovariate classification?
I'm looking for an R function that simply recodes a quantitative
variable into a number of classes according to specified break-points.
Obviously I can do this using nested ifelse() commands, but I want
to write it into a function where I can't pre-specify the number of
classes. Is there an obvious way to do this?
An example to clarify: how to convert c(0,10,5,1,9,6) to
2009 Dec 11
3
Correcting for missing data combinations
I can think of many brute-force ways to do this outside of R, but was
wondering if there was a simple/elegant solution within R instead.
I have a table that looks something like the following:
Factor1 Factor2 Value
A 11/11/2009 5
A 11/12/2009 4
B 11/11/2009 7
B 11/13/2009 8
>From that I need to generate all permutations of Factor1 and Factor2 and
force a 0 for any combination that doesn?t
2010 Mar 26
2
More efficient alternative to combn()?
Hi,
i am working on a problem where i need to compute the products of all
possible combinations of size m of the elements of a vector. I know that
this can be achieved using the function combn(), e.g.:
> vector <- 1:6
> combn(x = vector, m = 3, FUN = function(y) prod(y))
In my case the vector has 2000 elements and i need to compute the values
specified above for m = 32. Using combn() i
2012 Nov 16
1
pairing data using combn with criteria
Dear All,
I have a dataframe made up of individual beetles consisting of individual
number, family number, mother's family number, father's family number, and
sex of the beetle. I would like to pair up the individuals for breeding. I
would, however, like to avoid breeding beetles of the same sex (obviously),
the same family, and with the same mother's family or father's family,
2011 Oct 16
1
multicore combn
This is a 'rather than re-invent the wheel' post. Has anyone out there
re-written combn so that it can be parallelized - with multicore, snow, or
otherwise? I have a job that requires large numbers of combinations, and
rather than get all of the index values, then crank it through mclapply, I
was wondering if there was a way to just do this natively within a function.
Just curious.
2006 May 09
1
combn(n, k, ...) and all its re-inventions
It seems people are reinventing the wheel here:
The goal is to generate all combinations of 1:n of size k.
This (typically) results in a matrix of size k * choose(n,k)
i.e. needs O(n ^ k) space, hence is only applicable to
relatively small k.
Then alternatives have been devised to generate the combinations
"one by one", and I think I remember there has been a
quiz/challenge about 20
2009 Sep 21
2
Combine vectors in order to form matrixes with combn
Hello!
I've a problem with the combn function and a set of vector. I
would like to make a simple combination where, instead of scalars, i
would like to combine vector, in order to form matrixes.
In other
words, i have nineteen 6-items vectors (for example coef1-coef19), that
i would like to combine in n!/k!(n-k)! 6x6 matrixes.
I tried with a
code like this
mma <-
2011 Jan 10
1
Using combn
Dear list,
I want to apply the "table" function to every pair of variables in df
and the return should be a list.
setwd(123)
asd <- data.frame(a1=sample(1:4, 20, replace=TRUE),
a2=sample(1:4, 20, replace=TRUE),
a3=sample(1:4, 20, replace=TRUE),
a4=sample(1:4, 20, replace=TRUE))
with(asd, table(a1, a2))
with(asd, table(a1,
2008 Feb 08
2
Applying lm to data with combn
http://www.nabble.com/file/p15359204/test.data.csv
http://www.nabble.com/file/p15359204/test.data.csv test.data.csv
Hi,
I have used apply to have certian combinations, but when I try to use these
combinations I get the error
[Error in eval(expr, envir, enclos) : object "X.GDAXI" not found]. being a
novice I donot understand that after applying combination to the data I cant
access
2013 Jan 24
2
Please help R error message "masked from 'package:utils':combn"
Hi
The message occurred from R, when I was selected of "optimization > block
diagonal Fhiser matrix" and used the attached file on PFIM.
Could you please advise me about the following message?
*****************************
Loading required pakage: combinat
Attaching package:'combinat'
The following object(s) are masked from 'package:utils':combn
2007 Mar 27
2
Newbie: Combn and scripting
Hello All,
I have just installed my R 2.4 (windows) as a test trying to load a data
frame and run combn() for each line into another file. How do I do this?
data.csv:
a,b,c,d
1,2,3.4
g,3,6,t
etc
x=data.csv, m=3
Thank you
Zam
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2007 Jan 19
2
combn implementation
Hi,
I was checking the source code to the function combn that "generates
all combinations of the elements of 'x' taken 'm' at a time.",
because I wished to modify it. I have a doubt about a statement.
This is the main loop.
._1 <- 1:1
nmmp1 <- n - m + ._1
while (a[1] != nmmp1) {
if (e < n - h) {
h <- ._1
e <-
2009 Jul 10
2
to get the R-Squared value
Dear all,
I know there are 'coef', 'predict', 'fit' to get the corresponding
outputs. Is that possible to get the value of R-squared from a 'lm'
output?
Many thanks.
2009 Sep 08
1
Plotting two qqnorm plots:
Hi all,
Does anyone know how to plot overlapping qqnorm plots on the same window?
Suppose I have data in the vector x and y:
qqnorm(x)
lines(qqnorm(y))
I though these two lines will do the job... However, lines doesn't seem to
work. Anyways, thanks in advance!
--
View this message in context: http://www.nabble.com/Plotting-two-qqnorm-plots%3A-tp25352893p25352893.html
Sent from the R help
2010 Feb 18
1
Shapiro-Wilk test problem
Hi everybody,
Does anyone know what problem may be with this test.
I am applying 5 different normality tests and use p-values for them, but for
some reason S-W gives me NA, while sample size is 100.
Any ideas?
Thanks a lot!
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2011 May 16
1
help: Using hotelling for a confidence region for PCA scores
Hello everyone.
In my last post I did not explained my problem quite well. I made a principal component analysis and took the 2 first principal components. I made a chart of my points based on the score of the 2 PC. I would like to add on this graph a 95% confidence region. To do this I used the ellipse function as follows:
pcsref=PC$score[data[,1]==ref,1:2] #matrix containing the scores
2010 Jan 09
3
string functions
Hi!
Does anybody know a string function that would calculate how many
characters two strings share? I.e. ("Hello World","Hello Peter") would
be 7.
Thanks.
Laetitia