Displaying 20 results from an estimated 3000 matches similar to: "DICE Coefficient of similarity measure"
2008 Jul 23
18
Simple... but...
Hi R,
If
x=c(1,3,5)
y=c(2,4,6)
I need a vector which is c(1,2,3,4,5,6) from x and y.
How do I do it? I mean the best way....
Thanks, Shubha
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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
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2008 Aug 12
7
Between the values
Hi R,
This is a very trivial one....
C=0.1
I want to check whether my value of C is between 0 and 1 exclusively....
I don't want to use (C>0 & C<1). And I can't use a single statement like
(0<C<1). Is there a between function? Or how do we specify from 0 to 1?
Does %in% help me?
Many Thanks,
Shubha
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2010 Jul 27
1
as.dendrogram for DICE coefficient.
Hi R,
I was using 'as.dendrogram' with the DIST coefficient, where the smaller
values of the DIST coefficient, say that the objects are closer to each
other, while the larger values of the coefficient say that the objects
are far from each other.
But now, I have my coefficient as the DICE coefficient(in some sense
similar to correlation coefficient), where the larger coefficient
2008 Apr 09
11
Number of words in a string
Hi R,
A quick question: How do we find the number of words in a string?
Example:
C="Have a nice day"
And the number of words should be 4. any built in function or?...
Thanks, Shubha
Shubha Karanth | Amba Research
Ph +91 80 3980 8031 | Mob +91 94 4886 4510
Bangalore * Colombo * London * New York * San José * Singapore * www.ambaresearch.com
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2008 May 06
2
To preserve the class "Matrix"
Hi,
Suppose
a=matrix(1:9,3,3)
> a
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
Now,
> class(a[1:2,])
[1] "matrix"
> class(a[1:3,])
[1] "matrix"
> class(a[,1:2])
[1] "matrix"
> class(a[,1:3])
[1] "matrix"
But,
> class(a[1,])
[1] "integer"
> class(a[,1])
[1]
2008 Jul 23
8
sequential sum of a vector...
Hi R,
Let,
x=1:80
I want to sum up first 8 elements of x, then again next 8 elements of x,
then again another 8 elements..... So, my new vector should look like:
c(36,100,164,228,292,356,420,484,548,612)
I used:
aggregate(x,list(rep(1:10,each=8)),sum)[-1]
or
rowsum(x,group=rep(1:10,each=8))
But without grouping, can I achieve the required? Any other ways of
doing
2007 Feb 13
5
Fatigued R
Hi R,
Please solve my problem...........
I am extracting Bloomberg data from R, in a loop. R is getting fatigued
by doing this process and gives some errors. I introduced sleep
function. Doing this sometimes I get the results and sometimes not. I
even noticed that if I give complete rest for R (don't open R window)
for 1 day and then run my code with the sleep function, then the
2008 Mar 25
3
Dimensions of a List
Hi R,
I have a list,
l=list(list(c(1,2),c(4,5),c(6,7)),list(c(11,22,33),c(44,55,66)))
> l
[[1]]
[[1]][[1]]
[1] 1 2
[[1]][[2]]
[1] 4 5
[[1]][[3]]
[1] 6 7
[[2]]
[[2]][[1]]
[1] 11 22 33
[[2]][[2]]
[1] 44 55 66
How do I know the dimensions of this list?... In other words, how many
sub-lists, sub-sub-lists etc...are there in l? How do I know this?
2006 Nov 16
5
<RBloomberg Package Problem>
Hi R-Experts,
I'm currently using R 2.4.0 in Windows XP. I'm trying to download data
from Bloomberg using the package "RBloomberg", but it fails to install
the three needed packages "zoo", "chron" and 'Rbloomberg". Moreover I
am not able to find "RBloomberg" package as windows binary in CRAN
site as only for MAC it's given. Please
2010 Jan 03
2
Scores in Dimensions in Correspondence Analysis
Hi R,
I was experimenting with the CA package for correspondence analysis.
data(author)
ca(author)
plot(ca(author))
How can I get the values used by the plot for the two axis for biplot?
In other words, how will I be able to obtain the scores in the
dimensions (which are obtained by PCA) of the graphs? Thanks.
Thanks and Regards,
Shubha
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2006 Dec 02
4
Fwd: Urgent Help in Paste Command
Hi Experts,
I want to see my object as below:
'C:\Program Files\R\R-2.4.0\bin\Rgui.exe'
So I use the paste command. None of the below is working. Could anyone help
me on this?
> paste("'C:\Program Files\R\R-2.4.0\bin\Rgui.exe'")
[1] "'C:Program FilesRR-2.4.0\binRgui.exe'"
> paste("'C:","\","Program
2008 May 14
2
dataframes to a list
Hi R,
I have the data frames, data1, data2....data50. Now I want to put all of
these in a single list. But,
>list(data1, data2,.........data50) is very big to write. How do I then
do it?
Thanks,
Shubha
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2008 May 13
9
A Very Simple Question
On 5/13/2008 10:27 AM, Yukihiro Ishii wrote:
> Hi Rusers!
>
> I am ashed of asking such a simple question.
>
> X<-matrix(rnorm(24), 4)
> X0<-apply(X,2,mean)
>
> What I want is a matrix which consists of colums such as X[,1]--X0[1].
>
> X-X0 doesn't work.
>
> Perhaps apply function?
scale(X, scale=FALSE)
?scale
> Thanks in advance.
>
>
2008 Aug 07
3
Downloading Yahoo data
Hi R,
I am trying to download the data from R. I give the below command.
> library(fImport)
> yahooSeries("IBM")
trying URL
'http://chart.yahoo.com/table.csv?s=IBM&a=7&b=08&c=2007&d=7&e=07&f=2008&
g=d&x=.csv'
Error in download.file(url = url, destfile = file, method = method) :
cannot open URL
2008 Sep 29
3
Cross-tabulation Question
Hi R,
This is a cross tabulation question. Suppose that,
> d=read.table("clipboard",header=F)
> d
V1 V2 V3
A One Apple
A One Cake
A One Cake
B One Apple
B One Apple
B One Apple
> table(d$V2,d$V3)
Apple Cake
One 4 2
But, I don't want the count to be like the above. Here, it is counting
the
2007 Jan 23
4
Vector to Matrix transformation
Hi R,
I have a vector V1 of unknown length, say n. I need to convert this into
a matrix C of row size=5, and accordingly the column should be updated.
I tried with:
C=as.matrix(V1,5,n/5)
But it is not working...Could somebody help me on this?
Thanks in advance...
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2008 Jun 04
4
sum of unknown number of matrices
Hi R,
I have a list of matrices. I need to get the sum of all the matrices in
the list.
Example:
a=b=c=d=matrix(1:4,2,2)
l=list(a,b,c,d)
I need:
> a+b+c+d
[,1] [,2]
[1,] 4 12
[2,] 8 16
Something like do.call("+",l) is not working...why is this?
I may not be knowing the number of matrices in the list...
Thanks, Shubha
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2010 Jun 17
3
R user interface
Hi R,
I have a an excel file with a lot of data. I need to create an user
interface in R, which has one single screen. It needs to contain a right
pane containing the click buttons for different countries (say). If the
user clicks a country, then a chart needs to be created for that
country, taking the data from Excel. Is this possible and which package
helps me in doing this? Many thanks in
2007 Aug 20
3
Differentiation
Hi,
Could anyone tell me what is the command used in R to do
1. Differentiation
2. Newton Raphson method (Numerical Analysis in general...)
Are there any packages separately for this?
Thanks for your help!
BR, Shubha
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