Displaying 20 results from an estimated 3000 matches similar to: "combn(n, k, ...) and all its re-inventions"
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
2013 Sep 06
1
Importing function that is previously imported by other package
Dear developeRs,
I encounter the following problem: in the current version of my package
FrF2, certain calls to a functioni do not work when package combinat is
loaded, because function combn from combinat masks the function from
utils that my package uses.
I tried to solve this issue by importing function combn into the
namespace of FrF2; I don't need to export it, I just want to use it
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
2006 May 08
3
Non repetitive permutations/combinations of elements
Hello all,
I am trying to create a matrix of 1s and -1s without any repetitions for a
specified number of columns.
e.g. 1s and -1s for 3 columns can be done uniquely in 2^3 ways.
-1 -1 -1
-1 -1 1
-1 1 -1
-1 1 1
1 -1 -1
1 -1 1
1 1 -1
1 1 1
and for 4 columns in 2^4 ways and so on.
I finally used the function combn([0 1],3) that I found at the following link
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,
2008 Jul 03
1
Problem in applying conditional looping
Respected All,
I hope you are enjoying good health, I am tring to write a program in R but
could not be very sucessful. My program draws random sample form bivariate
normal distribution and then compute a variable PIJ. For certian samples
some entries of variable PIJ is apearing as negative, which result
in negative variance estimator. I want to introduce a loop in my program
that verify the each
2006 Oct 06
1
Sum of Bernoullis with varying probabilities
Hi Folks,
Given a series of n independent Bernoulli trials with
outcomes Yi (i=1...n) and Prob[Yi = 1] = Pi, I want
P = Prob[sum(Yi) = r] (r = 0,1,...,n)
I can certainly find a way to do it:
Let p be the vector c(P1,P2,...,Pn).
The cases r=0 and r=n are trivial (and also are exceptions
for the following routine).
For a given value of r in (1:(n-1)),
library(combinat)
Set <- (1:n)
2007 Apr 10
1
R CMD Rdconv drops sections: arguments, seealso, examples (PR#9606)
I've created a .Rd file (below), then converted that to .sgml using
R CMD Rdconv --type=Ssgm combn.Rd > combn.sgml
The output (shown below) is missing some of the sections:
arguments
seealso
examples
If instead I convert to .d (below), the same sections are missing,
and the "note" section is included but without the necessary newline.
2010 Apr 07
1
combn with factors
Dear list,
I have come across this issue:
combn(letters[1:5], 3)
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] "a" "a" "a" "a" "a" "a" "b" "b" "b" "c"
[2,] "b" "b" "b" "c" "c" "d" "c"
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.
2005 Aug 17
2
Copying rows from a matrix using a vector of indices
Hi,
I am trying to use a vector of indices to select some
rows from a matrix. But before I can do that I somehow
need to convert 'combinations' into a list, since
'mode(combinations)' says it's 'numerical'. Any idea
how I can do that?
library("combinat")
combinations <- t(combn(8,2))
indices <- c(sample(1:length(combinations),10))
# convert
???
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,
2006 Jul 13
1
looping using combinatorics
I have a problem where I need to loop over the total combinations of
vectors (combined once chosen via combinatorics). Here is a
simplification of the problem:
STEP 1: Define three vectors a, b, c.
STEP 2: Combine all possible pairwise vectors (i.e., 3 choose 2 = 3
possible pairs of vectors: ab,ac, bc)
NOTE: the actual problem has 8 choose 4, 8 choose 5 and 8 choose 6
combinations.
STEP
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
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 <-
2007 Apr 30
1
R CMD Rdconv drops sections: arguments, seealso, examples (PR#9645)
On Tue, 10 Apr 2007 timh at insightful.com wrote:
> I've created a .Rd file (below), then converted that to .sgml using
> R CMD Rdconv --type=Ssgm combn.Rd > combn.sgml
> The output (shown below) is missing some of the sections:
> arguments
> seealso
> examples
> If instead I convert to .d (below), the same sections are missing,
> and the "note"
2017 Nov 01
0
"prob" package alternative
> On Nov 1, 2017, at 12:51 PM, Tiby Kantrowitz <tlkantro at gmail.com> wrote:
>
> The prob package has been archived because it depends upon some other
> packages which have issues.
>
> However, such projects as Introduction to Probability and Statistics in R
> depend upon it for learning. There are a few other resources that also use
> it.
>
> Does anyone
2006 May 26
2
combinatorial programming problem
Hola!
I am programming a class (S3) "symarray" for
storing the results of functions symmetric in its
k arguments. Intended use is for association indices
for more than two variables, for instance coresistivity
against antibiotics.
There is one programming problem I haven't solved, making an inverse
of the index function indx() --- se code below. It could for instance
return the