Displaying 20 results from an estimated 20000 matches similar to: "non-numeric argument to binary operator"
2004 Sep 20
4
Multiple operations on list
Hello,
suppose I have a list with matrices:
a=list(x1=matrix(rnorm(10),5,2),x2=matrix(rnorm(10),5,2),x3=matrix(rnorm(10),5,2))
I want to compute for all combination of xi and xj (x1,x2 x1,x3 and x2,x3)
a value.
This value is given for the pair x1,x2 by trace(x1%*%t(x1)%*%x2%*%t(x2)) /
trace(x1%*%t(x1))*trace(x2%*%t(x2))
I know that product matrices t(xi)%*%xi can be obtained by:
2005 May 26
1
Simplify formula for heterogeneity
Dear R-ians,
I'm looking for a computational simplified formula to calculate a
measure for heterogeneity (let's say H ):
H = sqrt [ (Si (Sj (Xi - Xj)?? ) ) /n ]
where:
sqrt = square root
Si = summation over i (= 0 to n)
Sj = summation over j (= 0 to n)
Xi = element of X with index i
Xj = element of X with index j
I can simplify the formula to:
H = sqrt [ ( 2 * n * Si (Xi) - 2 Si (Sj
2010 Mar 26
2
R loop help
Hi,
I am tring to write a loop to compute this,
==========================
x1=c(
rep(-1,4),
rep(1,4)
)
x2=c(
rep(c(-1,-1,1,1),2)
)
x3=c(
rep(c(-1,1),4)
)
x1*x2
x1*x3
x2*x3
========================
suppose i have x1,x2,x3
i want to compute their ' two factor interactions', x1x2,x1x3 and x2x3,
I wrote
========================
for(i in 1:2){
for( j in i+1:3){
xij=c()
2008 Oct 25
1
pairwise.wilcox.test for paired samples
Dear R Core,
pairwise.wilcox.test does not handle "paired = TRUE" correctly; e.g.
set.seed(13)
x <- rnorm(20)
g <- c(rep(1, 10), rep(2, 10))
wilcox.test(x ~ g)$p.value # 0.075
pairwise.wilcox.test(x, g)$p.value # 0.075, o.k
wilcox.test(x ~ g, paired = TRUE)$p.value # 0.105
pairwise.wilcox.test(x, g, paired = TRUE)$p.value # 0.075, wrong
The line
wilcox.test(xi, xj,
1999 Aug 05
1
pairwise scatterplot matrix
Dear Friends:
I like so much to work with R program. Congratulations for your work.
I need R for work with multivariate data.
My question is:
With the pairs(X) command my output is a pairwise scatterplot symmetric matrix. Like:
| X1 |X1 vs X2|X1 vs X3|X1 vs X4|
|X2 vs X1| X2 |X2 vs X3|X2 vs X4|
|X3 vs X1|X3 vs X2| X3 |X3 vs X4|
|X4 vs X1|X4 vs X2|X4 vs X3| X4 |
It is
2004 May 24
1
as.matrix.data.frame() in R 1.9.0 converts to character when it should (?) convert to numeric
Conversion of a data frame to a matrix using as.matrix() when a
column of the data frame is POSIXt and all other columns are numeric
has changed in R 1.9.0 from R 1.8.1. The new behavior issues a
warning message and converts to a character matrix. In R 1.8.1, such
an object was converted to a numeric matrix.
Here is an example.
#### R 1.9.0 ####
> foo <- data.frame(
2008 Oct 22
1
R 2.8.0 qqnorm produces error with object of class zoo?
Dear list-reader,
by running the following script:
library(zoo)
sessionInfo()
search()
packageDescription("zoo")
data(EuStockMarkets)
dax <- as.zoo(EuStockMarkets[1:10, "DAX"])
daxr <- diff(log(dax))
identical(as.vector(qnorm(daxr)), qnorm(coredata(daxr)))
qqnorm(coredata(daxr))
qqnorm(daxr)
qqnorm() produces an error:
> qqnorm(daxr)
Fehler in if (xi == xj) 0L
2014 Sep 08
2
Problem with order() and I()
I have found that order() fails in a rather arcane circumstance, as in
this example:
> foo <- I( c('x','\265g') )
> order(foo)
Error in if (xi > xj) 1L else -1L : missing value where TRUE/FALSE needed
> foo <-c('x','\265g')
> order(foo)
[1] 1 2
> sessionInfo()
R version 3.1.1 (2014-07-10)
Platform: x86_64-apple-darwin13.1.0 (64-bit)
2009 Mar 12
1
zooreg and lmrob problem (bug?)
Hi all and thanks for your time in advance,
I can't figure out why summary.lmrob complains when lmrob is used on a
zooreg object. If the zooreg object is converted to vector before
calling lmrob, no problems appear.
Let me clarify this with an example:
>library(robustbase)
>library(zoo)
>dad<-c(801.4625,527.2062,545.2250,608.2313,633.8875,575.9500,797.0500,706.4188,
2010 Apr 02
1
POSIX primer
I have not used POSIX classes previously and now have a need to use them. I have sports data with times of some athletes after different events. I need to perform some simple analyses using the times. I think I've figured out how to do this. I just want to confirm with others who have more experience that this is indeed the correct approach. If not, please suggest a more appropriate way.
2011 Jul 11
1
plot means ?
Hi,
I need this plot:
given: x,y - numerical vectors of length N
plot xi vs mean(yj such that |xj - xi|<epsilon)
(running mean?)
alternatively, discretize X as if for histogram plotting and plot mean y
over the center of the histogram group.
is there a simple way?
thanks!
--
Sam Steingold (http://sds.podval.org/) on CentOS release 5.6 (Final) X 11.0.60900031
http://thereligionofpeace.com
2005 Nov 04
2
Simplify iterative programming
Dear,
I am looking for the simplification of a formula to improve the
calculation speed of my program. Therefore I want to simplify the
following formula:
H = sum{i=0..n-1 , [ sum {j=0..m-1 , sqrt ( (Ai - Bj)^2 + (Ci -
Dj)^2) } ] }
where:
A, C = two vectors (with numerical data) of length n
B, D = two vectors (with numerical data) of length m
sqrt = square root
Ai = element of A with index
2008 Jun 06
1
How to force two regression coefficients to be equal but opposite in sign?
Is there a way to set up a regression in R that forces two coefficients
to be equal but opposite in sign?
I'm trying to setup a model where a subject appears in a pair of
environments where a measurement X is made. There are a total of 5
environments, one of which is a baseline. But each observation is for
a subject in only two of them, and not all subjects will appear in
each
2011 May 16
2
about spearman and kendal correlation coefficient calculation in "cor"
Hi,
I have the following two measurements stored in mat:
> print(mat)
[,1] [,2]
[1,] -14.80976 -265.786
[2,] -14.92417 -54.724
[3,] -13.92087 -58.912
[4,] -9.11503 -115.580
[5,] -17.05970 -278.749
[6,] -25.23313 -219.513
[7,] -19.62465 -497.873
[8,] -13.92087 -659.486
[9,] -14.24629 -131.680
[10,] -20.81758 -604.961
[11,] -15.32194 -18.735
To calculate the ranking
2001 Aug 10
1
An applied math question with solve()
I have a math (and maybe an R) question.
I want to find equilibrium population density values for a system of linear
population growth equations (e.g., Pimm and Lawton 1977). The eventual goal
is to
perform stability analysis. I can find the partial differential equations
for the Jacobian matrix, but I get stuck trying finding the equilibriuym pop
densities (X*). Here is the (incorrect?) R code
2009 Oct 14
1
using mapply to avoid loops
Hello, I would like to use mapply to avoid using a loop but for some reason, I can't seem to get it to work. I've included copies of my code below. The first set of code uses a loop (and it works fine), and the second set of code attempts to use mapply but I get a "subscript out of bounds" error. Any guidance would be greatly appreciated. Xj, Yj, and Wj are also lists, and s2,
2006 Jul 07
6
parametric proportional hazard regression
Dear all,
I am trying to find a suitable R-function for
parametric proportional hazard regressions. The
package survival contains the coxph() function which
performs a Cox regression which leaves the base hazard
unspecified, i.e. it is a semi-parametric method. The
package Design contains the function pphsm() which is
good for parametric proportional hazard regressions
when the underlying base
2008 Aug 27
2
r function for calculating extreme spread in group
I'm trying to figure out how to write a r function that will calculate
the extreme spread of a group of points given their (x,y)
coordinates. Extreme Spread is the maximal Euclidean distance between
two points in a group
ex.spread = max{ sqrt [ (xi-xj)^2 - (yi-yj)^2 ] } for i not equal to j
I have 60 levels to apply this to.
There is the combination function in the dprep package but
2008 Nov 12
2
pairwise.wilcox.test
Un texte encapsul? et encod? dans un jeu de caract?res inconnu a ?t? nettoy?...
Nom : non disponible
URL : <https://stat.ethz.ch/pipermail/r-help/attachments/20081112/618073fe/attachment.pl>
2008 Jul 01
1
[.data.frame speedup
Below is a version of [.data.frame that is faster
for subscripting rows of large data frames; it avoids calling
duplicated(rows)
if there is no need to check for duplicate row names, when:
i is logical
attr(x, "dup.row.names") is not NULL (S+ compatibility)
i is numeric and negative
i is strictly increasing
"[.data.frame" <-
function (x, i, j,