Displaying 20 results from an estimated 20000 matches similar to: "Copying rows from a matrix using a vector of indices"
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
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
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 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.
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
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
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)
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 Jan 30
2
yet another vectorization question
Dear R-helpers,
I'm trying to develop a function which specifies all possible expressions that
can be formed using a certain number of variables. For example, with three
variables A, B and C we can have
- presence/absence of A; B and C
- presence/absence of combinations of two of them
- presence/absence of all three
A B C
1 0
2 1
3 0
4 1
5 0
6 1
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
2015 Mar 23
2
Combinatoria
Hola Jorge, gracias por ayudarme antes de empezar. Ayer me fui a cama con
tan solo escribir el título "Ecuaciones no lineales"
Básicamente lo que voy a buscar es lo clásico, es decir, resolver cualquier
ecuación no lineal, ya sea polinómica o trascendente, con una o varias
incógnitas.
Ejemplo típico:
x^2 + y^2 = 1
y = sin x
Si me van surgiendo dudas, aquí estaré, no lo dudéis.
Por
2015 Mar 22
2
Combinatoria
Ya me extrañaba a mi!
Mañana a primera hora miro todo lo que me comentas.
Ahora estoy con ecuaciones no lineales y ya veo que hay que cargar
librerias
Muchas gracias. Un saludo
El 23 de marzo de 2015, 0:08, Carlos Ortega <cof en qualityexcellence.es>
escribió:
> Hola,
>
> Por precisar un par de detalles:
>
>
> - Con el paquete gtools se pueden generar:
> - las
2017 Nov 02
2
"prob" package alternative
The issue is fAsianOptions. Is there a version that works with the latest
version of R? If not, which version of it works with which version of R and
where can it be found? I tried several at the archive already.
Alternatively, is there another package that behaves similarly to prob?
On Wed, Nov 1, 2017 at 6:17 PM, David Winsemius <dwinsemius at comcast.net>
wrote:
>
> > On Nov
2015 Mar 22
3
Combinatoria
Hola amigos, muchas gracias por vuestra ayuda.
Entonces veo que mi sorpresa era legítima. Por todos vuestros mails la
conclusión es que:
- En el módulo base de R no incluye combinatoria elemental, ni siquiera
el número combinatorio Cm,n hay que cargar el paquete *combinat*
- Y para las variaciones con repetición el paquete* gtools*
- Y aún así no tenemos ni las combinaciones ni las
2015 Mar 21
3
Combinatoria
Hola buenos días, me presento, me llamo Miguel y 'soy de' y 'vivo en'
Galicia.
Soy profesor de secundaria (Bachillerato Adultos) y llevo 15 días
estudiando R a un buen ritmo, pero todavía me faltan miles de cosas.
He visto que R facilita, no solo el análisis de datos y que posee una
potencia en cálculos estadísticos a cualquier nivel, sino gran caudal de
recursos para Data Mining,
2013 Apr 12
2
processing matrix equation derived from rows of two matrices
Hi,
May be this helps:
?tb[1,]%*%(((val-rep(meansb79[1,],5))^2)/6)
#??????? [,1]
#[1,] 1.47619
tryvarb<-c(1,2,3,4,4,4,4)
?var(tryvarb)
#[1] 1.47619
tb[2,]%*%(((val-rep(meansb79[2,],5))^2)/6)
#???????? [,1]
#[1,] 1.904762
sapply(seq_len(nrow(tb)),function(i) tb[i,]%*%(((val-rep(meansb79[i,],5))^2/6)))
# [1] 1.4761905 1.9047619 1.9047619 1.9047619 1.9047619 2.2857143 1.9047619
# [8] 1.9047619
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"
2010 Nov 25
2
delete-d jackknife
Hi dear all,
Can aynone help me about delete-d jackknife
usually normal jackknife code for my data is:
n <- nrow(data)
y <- data$y
z <- data$z
theta.hat <- mean(y) / mean(z)
print (theta.hat)
theta.jack <- numeric(n)
for (i in 1:n)
theta.jack[i] <- mean(y[-i]) / mean(z[-i])
bias <- (n - 1) * (mean(theta.jack) - theta.hat)
print(bias)
but how i can apply delete-d jackknife
2015 Mar 22
2
Combinatoria
Hola Miguel,
Sí se pueden obtener las variaciones con y sin repetición en R.
Eso sí están un poco escondidas...
Se pueden calcular de esta forma:
#----------------------
> #Cargar el paquete gtools
> library(gtools)
> #Definir el conjunto sobre el que se hará el cálculo
> x <- c('rojo', 'azul', 'verde')
> #Utilizar la función "permutations()"
2017 Nov 02
0
"prob" package alternative
> On Nov 2, 2017, at 11:15 AM, Tiby Kantrowitz <tlkantro at gmail.com> wrote:
>
> The issue is fAsianOptions. Is there a version that works with the latest version of R? If not, which version of it works with which version of R and where can it be found? I tried several at the archive already.
sessionInfo()
R version 3.4.2 Patched (2017-10-04 r73465)
Platform: