Displaying 20 results from an estimated 1000 matches similar to: "how can i sort a column of data.frame ?"
2008 Jun 08
2
multinormality
is there any function under R that allows me to test the normality of my 92
sumples?
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2008 May 18
2
how can i superpose 2 graphs
Hio
i tried to do this by:
par(new=TRUE)
but the result is one picture but y-axis has 2 diff?rent graduations.how can
i correct this?( i want one graduation on y axis).
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2008 May 29
2
lm() function
hi,
my linear model is y=c+a*x1+b*x2 i tried to found a, c, b by the use of:
mymodel<-lm(y~1+x1+x2) where y, x1, x2 are 3 vectors with the same length
the result is a=NA.so i want to know where is the problem.
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2008 May 19
2
i want to export a data.frame to file.xls
in order to export a data.frame to sheet.xls i try:
write(df,file="file_name.xls")
but when i open it a message appears:
"impossible to oppen this file. her format is unvalid"
knowen that i work with excel_2007
what is the solution ?
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2008 May 18
3
two curves at one graph
i try to use par(new=TRUE) i get them at the same graph but the y_axis and
x_axis are drowen with two unevenly graduations that graph become
unreadable.
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2008 May 16
1
(1-alpha)th percentile
hello;
firstly, my gratitude to all who help me to find a function that allows me
to add confidence interval to my graph.
in order to calculate the (1-alpha)th percentile of for exemple an
F(df1,df2) distribution i do like this:
v<-df(alpha,df1,df2)
percentile<-qf(v,df1,df2,alpha)
if it is true please alert me , and if it is not what should do then?
:handshake:
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2008 Feb 12
2
how to specify modes of certain fields in read.table
I have a data file with 50 columns. Among them, there are two
coordinates, X and Y
X
Y
641673.78807
3607080.78438
641436.56207
3607108.30543
641165.28042
3607136.82957
640879.58373
3607116.20568
When I use read.table, it rounds X and Y to the maximal 8 decimal number
as.
641673.8 3607081
641436.6 3607108
641165.3 3607137
640879.6 3607116
640683.5 3607105
My question
2008 Feb 11
2
how to generate a column based on other columns in a data frame
HI,
I am working on a data set with multiple collections of mosquitoes at
sampling sites. Each row represents a collection of individual samples
with coordinates for each collection.
... X, Y,...
1 36.435 30.118
2 36.435 30.118
3 36.435 30.118
4 35.329 29.657
5 35.329 29.657
6 36.431 30.111
7 36.431 30.111
8 35.421 29.797
9 35.421 29.797
10 35.421 29.797
2008 May 06
1
substring
I have a data frame such as
Name
DISC1_5916
DABC2_789
ABCD_1234
I want to substring column Name so that
DISC1
DABC2
ABCD
...
Thanks.
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2008 Sep 07
1
run optim() on a list
Hi,
I am at the end of my wit to figure out how to run the optim function on
a list.
Basically, I have a data set of three columns as "Site", "Pool" and
"Positivity" ( the full data set is copied at the end). I want to run
the maximal likelihood estimation separately on subsets split by "Site"
data<-read.table(...)
2008 Jan 31
1
decrease amount of ticks on y axis in lattice levelplot
Hi all,
How can I decrease the number of ticks on the y-axis in a lattice
levelplot()? I have as many ticks displayed on the y-axis as I have
columns of data (1000 columns), how can I decrease this amount of ticks,
while still properly displaying all the data?
Note that I get my data from a matrix object, in which the z-values of
the levelplot are the actual values in the matrix, whereas the
2008 May 14
2
is there any graphic function
hello:
is there any graphic function under R that allow me to add an interval on
the graphic's picture at any place i want.
i mean by interval the symbol "|----|" showed verticaly and has as middle
the point M with coordinates (yi,ti).please answer me as soon as possible.
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2013 Feb 23
5
Selecting First Incidence from Longitudinal Data
I have a longitudinal competing risk data of the form:
ID COMPL SEX HEREDITY
1 0 1 2
1 0 1 2
1 3 1 2
2 0 0 1
2 1 0 1
2 2 0 1
2 2 0 1
3 0 0 1
3 0 0 1
3 0 0 1
3 0 0 1
3 2 0 1
4 0 1 2
4 0 1
2010 Dec 14
1
rpart - how to estimate the “meaningful” predictors for an outcome (in classification trees)
Hi dear R-help memebers,
When building a CART model (specifically classification tree) using rpart,
it is sometimes obvious that there are variables (X's) that are meaningful
for predicting some of the outcome (y) variables - while other predictors
are relevant for other outcome variables (y's only).
*How can it be estimated, which explanatory variable is "used" for which of
2008 Jun 05
2
bartlett.test()
i'm trying to test the homogeneity of variance of 92 samples each one
contains 3 observations.
to use bartlett.test function i have created a (3,92) matrix (named xx):
>bartlett.test(xx)
this message appears:
>Erreur dans bartlett.test.default(xx) :
l'argument "g" est manquant, avec aucune valeur par d?faut
when i checked the help i have understood that in g i should
2008 Jan 07
1
one question
I had a program voice chat programmed in delphi now i have a programmer making a new one in vb.net he has informed me speex does not work in vb.net applications i don't understand why not can you give some assistance
Thanks Hanen
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2008 Feb 08
4
how to extract characters from a character string
Hi, I ran into a problem when I complied a dataset with UTM coordinates.
For calculating distances between sites, I need to reformat the
coordinates from, for example,
32?35.421 N, to 35.421, i.e. I need to delete all digits before symbol ?
and a space and N at the end of the string. What functions I should use?
Thanks in advance.
Weidong Gu,
Department of Medicine
University of
2008 Jun 16
1
minimizing title's police
in order to minimize the police of the title of my graph i tried to use:
>title("nombre de fleurs donn?es journellement par 6 cereus peruvianus du
1/07/02 au 31/09/02",font=0)
but this message appears:
Erreur dans title("nombre de fleurs donn?es journellement par 6 cereus
peruvianus de 1/07/02 au 31/09/02", :
valeur sp?cifi?e pour le param?tre graphique
2007 Apr 20
2
sorting data in R
hello,
I'd like know how to sort a data frame in R for example how I should do to sort by Catholic with swiss data frame like below
thanks
Fertility Agriculture Examination Education Catholic Infant.Mortality
Courtelary 80.2 17.0 15 12 9.96 22.2
Delemont 83.1 45.1 6 9 84.84 22.2
2004 Jan 13
1
SMB Signature verification failed on incoming packet
My setup is Samba/smbclient version 3.0.1 on linux RedHat 9.
\\snapper\dfs is a dfs share on snapper, a Win2k3 Active Directory
server. My smb.conf contains:
[global]
realm = ciswinnet.cis.uab.edu
workgroup=CISWINNET
security = ADS
encrypt passwords = yes
password server = snapper.cis.uab.edu
client use spnego = yes
I am trying to run the following command:
smbclient \\\\snapper\\dfs