Displaying 20 results from an estimated 4000 matches similar to: "ascii or regex code for alt-enter for Excel"
2008 Oct 17
1
how to list variables enclosed in an environment
I'm having trouble with a Bioconductor package, an variable expected in an
environment does not seem to be there. As part of my investigation of the
problem (most likely on my end) I'd like to list the variables contained in
an environment. If you have an environment loaded, lets call it "pkgEnv',
how does one find what it does contain? Mark
2008 May 06
3
rggobi is crashing R-2.7.0
I am running 64-bit Ubuntu 8.04 and when I invoke rggobi the interactive
graph displays but R crashes. See my sessionInfo() and a short example
below. Ggobi and rggobi installed without complaints. Mark
> sessionInfo()
R version 2.7.0 Patched (2008-05-04 r45620)
x86_64-unknown-linux-gnu
locale:
2009 Aug 28
1
problems with strsplit using a split of ' \\\ ' : a regex problem
I have a vector of gene symbols, some of which have multiple aliases. In the
case of an alias, they are separated by ' \\\ '.
Here is a real world example, which would represent one element of my
vector:
Eif4g2 /// Eif4g2-ps1 /// LOC678831
What I would like to do is input the vector into a function and output a
vector with just the first alias of each element (or, if there are no
aliases,
2008 Mar 05
4
vertex labels in igraph from adjacency matrix
I am getting some unexpected results from some functions of igraph and
it is possible that I am misinterpreting the vertex numbers. Eg., the
max betweenness measure seems to be from a vertex that is not connected
to a single other vertex. Below if my code snippet:
require(igraph)
my.graph <- graph.adjacency(adjmatrix = my.adj.matrix, mode=c("undirected"))
most.between.vert <-
2008 Mar 12
2
subset list based on logical within element flag
I have a very long list that I'd like to subset based on a logical value
within each element. Example below. I'd like to get just those list
elements for further study whose $sig.cor slot is TRUE. In this example,
I'd only want element [[2]].
Should be simple, I know. How can I do this? Thanks, Mark
> gene.pair.tf.lst
[[1]]
[[1]]$gene.pair
[1] "Lgals1:Pxmp2"
2010 Jan 07
1
regex question on escaping "." (and a couple other regex questions as well)
I have an example where escaping "." does not seem to be behaving
consistently, but perhaps it is due to my misunderstanding. Could someone
explain to me why the below produces the output it does?
It seems to me that in the second example, where I am being more precise
about specifying that a "." (dot) should be between the numbers, should
produce the same output as the first
2010 Mar 07
2
vectorizing ANOVA over a vectorized linear model
Is it possible to vectorize anova over the output of a vectorized lm? I
have a gene expression matrix with each row being a gene and columns for
samples. There are several factors with interactions. I can get p values by
looping over the matrix with lm and anova, but I would like to make this as
computationally efficient as possible. I am able to vectorize the lm
command, but when I try to use
2007 Oct 30
6
trouble installing building packages from source using R 2.6.0 on Ubuntu Gutsy AMD64
I have recently upgraded to Ubuntu Gutsy and, for the first time, am
using a 64-bit installation. After failing miserably to install R from
source, not a problem for me in the past with a 32-bit install, I went
the route of using the Debian Etch build. This went smoothly, but I am
unable to update my numerous R and BioConductor packages, getting
non-zero exit status errors on each package. Is
2008 Oct 07
1
using assign with lists
I am performing many permutations on a data-set with each permutation
producing a variable number of results. I thought that the best way to keep
track of all this in one object would be with a list ('res.lst'). To address
these variable results for each permutation I attempted to construct this
list using 'assign'. There is even more nesting than indicated below, but
this is a
2009 Aug 20
5
help with regular expressions in R
I'm having trouble achieving the results I want using a regular expression.
I want to eliminate all characters that fall within square brackets as well
as the brackets themselves, returning an "". I'm not sure if it's R's use of
double slash escapes or something else that is tripping me up. If I only use
one slash I get
1: '\[' is an unrecognized escape in a
2008 Feb 07
1
help with R rendering engine
I'm doing some work on a potential patch to the Bioconductor package
Rgraphviz and have some questions on code that is contained in engine.c.
In particular, I am developing some custom shapes using polygon and need
to make sure that, with rendering, the line connecting the centers of
two polygons stops at the border of each polygon. The polygons can be
transparent, so the option of just
2009 Jul 04
4
help with dealing with integer(0) returns from grep used within a conditional loop
I am using grep to locate colnames to automate a report build and have
run into a problem when a colname is not found. The use of integer(0)
in a conditional statement seems to be a no no as it has length 0.
Below is a self-contained trivial example. I would like to get
something like "NA" or -1 for the position when it is not found OR
learn a way to use integer(0) or some
2008 Sep 24
1
splitting strings efficiently
I have a very long list of strings. Each string actually contains multiple
values separated by a semi-colon. I need to turn each string into a vector
of the values delimited by the semi-colons. I know I can do this very
laboriously by using loops, nchar, and substr, but it is terribly slow. Is
there a basic R function that handles this situation? If not, is there
perhaps a faster way to do it than
2009 Nov 12
2
package "tm" fails to remove "the" with remove stopwords
I am using code that previously worked to remove stopwords using package
"tm". Even manually adding "the" to the list does not work to remove "the".
This package has undergone extensive redevelopment with changes to the
function syntax, so perhaps I am just missing something.
Please see my simple example, output, and sessionInfo() below.
Thanks!
Mark
require(tm)
2008 Mar 05
1
connectivity measure for graph nodes
I am doing some work the Rgraphviz, a Bioconductor package, but since my
question is of a more general nature, thought I would send to this list
in hopes that a graph theory expert could answer my question.
I wish to do some statistics on node-node relationships. In particular,
I want to see if two connected nodes share a common property. I believe
that the more "connected" the two
2009 Sep 16
4
2.10.0 Under development (unstable) (2009-09-15 r49711) just built segfaults on Debian Squeeze
I just downloaded R-devel and when loaded it immediately segfaults. I'm not
sure how much or what sort of diagnostic info and can provide, but below is
my build script, my console output, and the output of uname -r. I am
currently dependent on the development version of a package, so I'd like to
get R-devel up and running if possible. I am sure there is more info I can
provide, but before
2007 Dec 10
2
00LOCK error with site-library
I have identical R.profiles and R_HOME directories set up on both my
local machine and a remote linux cluster. To keep my libraries and R
install separate, I use a site-library on both machines.
The first line of my .Rprofile is:
'.libPaths(new= "~/R_HOME/site-library") #tell R where site-library is'
Until R-2.6.0 this was working fine on both machines, but since I have
been
2009 May 30
2
'options=utils::recover' not working in .Rprofile or within R
For years I have been using options(error = recover) either in .Rprofile or
from within R for debugging purposes. The functionality of this appears to
have changed and I can't recover it (no pun intended) using the ?options
help page. How can I get the old functionality back, particularly from
within .Rprofile? A specific line entry would be appreciated. An example,
the help page, and
2009 Oct 28
2
how to model a numeric factor as a non-ordinal factor
I am analyzing an experiment in which time is a factor, represented by
numbers indicating time since last treatment, but in this particular case
there is no reason to think that time has a numeric meaning in the sense
that 24 would be greater than 6. We have no idea which genes will be
increasing or decreasing at different times.
So I have the following model (to be applied over many genes):
mod
2008 Mar 18
1
problem with merge
I have used merge regularly and thought I understood how it worked, but
I must not. I have two dataframes with identical colnames from two
different experiments, TL01 and LC01. Each dataframe has a column named
"Entrez.Gene", which I have converted to "as.character" just to make
sure merge is not looking at factor levels. Because I have done some
filtering, the Entrez.Gene