Displaying 20 results from an estimated 3000 matches similar to: "Declaring variables in R"
2007 Jun 14
3
Responding to a posting in the digest
Is there a convenient way to respond to a particular
posting which is a part of the digest?
I mean something that will automatically quote the
original message, subject, etc.
Thank you!
Moshe Olshansky
m_olshansky at yahoo.com
2008 Jul 10
5
rounding
Hi,
Round(0.55,1)=0.5
Round(2.55,1)=2.6
Can this be right?
Thanks,
Ed
[[alternative HTML version deleted]]
2008 Aug 24
3
Igraph library: How to calculate APSP (shortest path matrix) matrix for a subset list of nodes.
Dear R Users,
I have a network of 25000 total nodes and a list of 500 node which is a
subset of all nodes. Now I want to calculate the APSP (all pair shortest
path) matrix only for these 500 nodes.
I would appreciate any help.
Thanks in advance
Dinesh
--
Dinesh Kumar Barupal
Research Associate
Metabolomics Fiehn Lab
UCD Genome Center
451 East Health Science Drive
GBSF Builidng
University of
2008 Jan 21
5
"nonstandard" column names
Hi everyone,
I am sure that this question has been asked here some
time ago but I do not remember the answer and was
unable to find it in the archives...
Below is my question: suppose that I have a data.frame
x and one of it's columns name is "CPI/RPI" (without
quotation marks of course). How can I reference this
column? Neither of x$CPI/RPI or x$"CPI/RPI" work. I
2007 Aug 07
5
small sample techniques
If my sample size is small is there a particular switch option that I need to use with t.test so that it calculates the t ratio correctly?
Here is a dummy example?
รก =0.05
Mean pain reduction for A =27; B =31 and SD are SDA=9 SDB=12
drgA.p<-rnorm(5,27,9);
drgB.p<-rnorm(5,31,12)
t.test(drgA.p,drgB.p) # what do I need to give as additional parameter here?
I can do it manually but
2007 Mar 23
6
Updating a worksheet in Excel file using RODBC
Hello!
I have no problem reading Excel files (each worksheet in the file is a "table" which can be read - at least in my case).
What I would like to do is to read such a table, change it (just the contents, not the format) and write it back, and this I can not do. I am getting the following error messages (3 slightly different attempts):
> sqlSave(con, x, tablename =
2008 Jul 08
8
Sum(Random Numbers)=100
Hi R,
I need to generate 50 random numbers (preferably poisson), such that
their sum is equal to 100. How do I do this?
Thank you,
Shubha
This e-mail may contain confidential and/or privileged i...{{dropped:13}}
2007 Nov 08
1
finite mixture model (or latent class)
Dear Listers,
My post might be somewhat OT.
Currently, I am trying to use flexmix to build a finite mixture model.
For instance, I am getting the prior probability and coefficients for
each latent class from training data. Is there a way to get the
posterior probablity and prediction of a new dataset?
What I am thinking is to apply the prior prob and coefficient from
training set to testing data
2007 Aug 17
1
[BioC] function to find coodinates in an array
The arr.ind in the which function does the job very nicely!!!
Thank you everyone for the suggestions!
Ana
>
>
>---- Mensaje Original ----
>De: marc_schwartz at comcast.net
>Para: m_olshansky at yahoo.com
>Asunto: Re: [BioC] [R] function to find coodinates in an array
>Fecha: Thu, 16 Aug 2007 21:53:44 -0500
>
>>If I am correctly understanding the problem, I think
2007 Aug 11
1
binomial simulation
hello,
I asked about this simulation a few days ago, but still i can't get what i
need.
I have 2 units: icu and regular. from icu I want to take 200 observations
from binomial distribution, when probability for disease is: p=0.6.
from regular I want to take 300 observation with the same probability: p=0.6
.
the distribution to detect disease when disease occurred- *for someone from
icu* - is:
2008 Apr 29
3
Simulation study in R
Here I am in a simulation study where I want to find different values
of x and y such that f(x,y)=c (some known constant) w.r.t. x, y >0,
y<=x and x<=c1 (another known constant). Can anyone please tell me how
to do it efficiently in R. One way I thought that I will draw
different random numbers from uniform dist according to that
constraints and pick those which satisfy f(x,y)=c. However
2007 Oct 17
3
type conversion
Hello,
I am trying to do arithmetic on numbers extracted from a PostgreSQL
database, wherein the numbers are stored as type "money". The
transcript below illustrates the problem.
> Membersind06 <- sqlQuery(channel,"select * from income where rowname like '%Membersind%'")
> names(Membersind06)
[1] "rowname" "item"
2007 Oct 11
2
Rearranging dataset
Hi all, I have a datasei like this :
ID Date Price
aa 01/01/07 12
aa 01/02/07 13
bb 01/01/07 23
bb 01/02/07 12
Now I want to write them in following format :
ID Date Price ID Date Price
aa 01/01/07 12 bb 01/01/07 23
aa 01/02/07 13
2007 Jul 19
3
help with heatmap - how to remove annoying "X" before numeric values?
Hello All,
I have a simple question based on how things are labeled on my heat map;
particularly, there is this annoying "X" that appears before the numeric
value of all the labels of my columns.
Let's say I have the following silly data, stored in "temp.txt"
1905 1910 1950 1992 2011 2020
Gnat 0.08 0.29 0.29 0.37 0.39 0.43
Snake
2017 Jun 18
2
dist function in R is very slow
Hi Stefan,
Thank you very much for pointing me to the wordspace package. It does the job a bit faster than my C code but is 100 times more convenient.
By the way, since the tcrossprod function in the Matrix package is so fast, the Euclidean distance can be computed very fast:
euc_dist <- function(m) {mtm <- Matrix::tcrossprod(m); sq <- rowSums(m*m);? sqrt(outer(sq,sq,"+") -
2013 Jan 16
2
Codetools Query (repost)
Sorry for reposting, i keep forgetting this should be plain text.
Will not make this mistake again
Hello,
The following code
moo <- function(a=1){ x=1; x=x+y}
funs <- new.env()
enter <- function(type, v, e, w){
assign(v, TRUE, funs)
}
library(codetools)
collectUsage(moo, enterGlobal = enter)
adds + to the environment funs i.e.
funs: "=" "{" "+"
2007 Nov 27
2
lme object manipulation
Hello:
I have an lme object, say lme_res2, which was generated using the varIdent. I'm trying to extract the double 1.532940 from the object, but I can't find it by attributes(lme_res2) or attributes(summary(lme_res2)). How can I pull it out (so that I can save it to another variable)? Thanks.
Shin
Linear mixed-effects model fit by REML
Data: dat
Log-restricted-likelihood:
2011 Jan 06
2
Global variables
Dear R-users,
Is there a way I can prevent global variables to be visible within my
functions?
Sebastien
2005 Sep 07
1
solving a system of nonlinear equations
What is the "classic" R function for solving a (possibly over
determined) system of non-linear equations?
Thank you!
Moshe Olshansky
e-mail: moshe.olshansky@brevanhoward.com
The information transmitted is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or
2008 Jul 31
2
stats question
Dear friends,
I am not sure that this is the right place?to ask,? but please feel?free to suggest an alternative discussion group.
My question is that I?want to do a comparative study in order to compare the rate of incidence in two populations. I know that a pilot study was conducted a few weeks ago and found?8/140 (around 6%) incidence in population A. Population B was not sampled. Assuming