Displaying 20 results from an estimated 3000 matches similar to: "how to split data.frame by row?"
2007 Apr 24
5
intersect more than two sets
Hi,
I searched the archives and did not find a good solution to that.
assume I have 10 sets and I want to have the common character elements of them.
how could i do that?
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2007 Apr 11
5
how to reverse a list
Hi, there:
I am wondering if there is a quick way to "reverse" a list like this:
t0 <- list(a=1, b=1, c=2, d=1)
reverst t0 to t1
> t1
$`1`
[1] "a" "b" "d"
$`2`
[1] "c"
thanks.
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2007 Jun 25
3
a string to enviroment or function
Hi,
I am wondering how to make a function Fun to make the following work:
t0 <- (paste("hgu133a", "ENTREZID", sep=""))
xx <- as.list(Fun(t0)) # make it work like xx<-as.list(hgu133aENTREZID)
thanks,
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2006 Oct 17
4
cluster in R
hi,
is there some good summary on clustering methods in R? It seems there
are many packages involving it.
And I have two questions on clustering here:
1. Is there a way of evaluate the effecitives (or seperation) of
clustering (rather than by visualization)?
2. Is there a search method (like genetic search) which can help find
the best subset of attributes which gives best seperation?
Thanks,
2008 Aug 24
2
similarity between two gene lists with varied length
Dear listers,
a little off-topic:
I am looking for and compare algorithms which can calculate "distance" or
"similarity" between two gene lists with different lengths.
Any paper, any implementation in R and any suggestion is welcome!
Thanks,
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
2009 Jul 13
2
how to keep row name if there is only one row selected from a data frame
Hi, there:
Assume I have a dataframe with rownames like A with rownames like a to e,
> A
[,1] [,2]
a 1 6
b 2 7
c 3 8
d 4 9
e 5 10
when I use A[1,], I lost the rowname for it, like below. How could I keep
it? Is there an easy way instead that I have to modify by myself after I
used A[1,] manually.
> A[1,]
[1] 1 6
Thanks,
W.
--
Weiwei Shi, Ph.D
Research
2007 Jun 25
4
how to plot this?
Hi, there:
Suppose I have a couple of data.frames and each one has five columns
(one for x-axis, two for y-axis and two for std of y's.) There is
another dimensions (besides x and y) which is continuous. My question
is, how to plot such series of data frames in one plot (thus,
3-dimensional plot) AND multiple 2-D plots. I am not familar with R's
plotting utilities.
Thanks.
--
Weiwei
2007 Nov 21
3
shrink a dataframe for plotting
I get tables with millions of rows. For plotting to a screen-size
jpg, obviously just about 1000 points are enough. Instead of feeding
plot() the original millions of rows, I'd rather shrink the original
dataframe, using some kind of the following interpolation:
-- split dataframe into chunks of N rows each, e.g. 1000 rows each
-- compute average for each column
-- issue one new row
2007 May 01
1
dlda{supclust} 's output
Hi,
I am using dlda algorithm from supclust package and I am wondering if
the output can be a continuous probability instead of discrete class
label (zero or one) since it puts some restriction on convariance
matrix, compared with lda, while the latter can.
thanks,
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
2006 Oct 31
2
how to plot a data.frame?
hi,
i have a data frame like this:
0.3 0.7
0.4 0.8
i am trying to plot this data frame and each cell is filled with
different colors based on the value. Is there a function which can do
this?
thanks,
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2007 Apr 23
6
Random Forest
Hi,
I am trying to print out my confusion matrix after having created my random
forest.
I have put in this command:
fit<-randomForest(MMS_ENABLED_HANDSET~.,data=dat,ntree=500,mtry=14,
na.action=na.omit,confusion=TRUE)
but I can't get it to give me the confusion matrix, anyone know how this
works?
Thansk!
Ruben
[[alternative HTML version deleted]]
2007 Jun 12
4
pretty report
Dear Listers:
I have a couple of data frames to report and each corresponds to
different condtions, e.g. conditions=c(10, 15, 20, 25). In this
examples, four data frames need to be exported in a "pretty" report.
I knew Perl has some module for exporting data to Excel and after
googling, I found R does not.
So I am wondering if there is a package in R for generating good
reports. I
2007 Jun 18
3
source a specific function
Dear Listers:
For example, if I have a .R source file which has more than one
function, and I want to just load only one of the functions, how could
I do that? (removing the rest after sourcing is not what I intend b/c
in my workspace, I might have some of the rest and I don't want to
change my workspace: i.e., I only change my workspace by adding one
function from a R source file).
Thanks,
2007 Nov 23
4
PCA with NA
Dear all,
(Mac OS X 10.4.11, R 2.6.0)
I have a quantitative dataset with a lot of Na?s in it. So many, that
it is not possible to delete all rows with NA?s and also not
possible, to delete all variables with NA?s.
Is there a function for a principal component analysis, that can deal
with so many NA?s.
Thanks in advance
Birgit
Birgit Lemcke
Institut f?r Systematische Botanik
2008 Sep 07
1
cohen's kappa
Dear all,
I have a question on Cohen's kappa:
Assume I have two datasets, one has 500 objects, 10 methods and the other,
1000 different objects, 20 different methods. Could I compare between the
two datasets to conclude the 10 methods are more "concordant" than the 20
ones by looking at some output, for example, cohen.kappa{concord} ?
One more, could anyone explain in brief,
2007 Dec 09
3
editor under MAC system
Dear R-user;
I recently switched from PC to MAC. Is there a compatible editor as
Win-editor with package RWinEdit for MAC?
Thanks
Yihsu Chen
[[alternative HTML version deleted]]
2006 Jul 01
3
Installation, permissions of /usr/local/lib/R (PR#9054)
Full_Name: Jori M?ntysalo
Version: 2.3.1
OS: Linux, GNU/Debian stable
Submission from: (NULL) (81.197.171.182)
I said
./configure --with-readline=no --with-x=no
make
make install
and everything works except that /usr/local/lib/R/etc/ldpaths was not readable
as normal user.
2007 Nov 21
1
problem with nb2listw
Hi,
I am a new student to R and I was hoping someone could help me with
the error message I keep getting when I try to use the nb2listw()
function.
I have 45 sites and I want to get an autocorrelation value for sites
within 1000m of each other.
coords<-cbind(EAST,NORTH)
coords<-as.matrix(coords)
nb1000<-dnearneigh(coords,0,1000,longlat=TRUE)
then when I try to run the
2007 Oct 22
1
grouping rows into bin ranges
Hi everyone,
I have a matrix that contains 1000 replicates of a sample of a list of values. I want to group each row (row=replicate) into my defined bin ranges and then calculate the mean and stdev for each of the bin ranges (so I will have 1000 rows but ncol=number of bin ranges).
I don't know how to group rows in a matrix matrix according to another vector (which is what I think I need to
2007 Nov 02
1
Sweave, and long lasting scripts
Dear R user,
I am using Sweave to write my reports with R code. Unlucly my code take a
lot of time to run, and I don't want to run it multiple time, if possible,
as I am still developping the tools.
It seems that a sweave run does not save the enviroment at the end of the
process, is there a way to avoid to lunch multiple time the same commands?
maybe it could be possible to store chunck of