Displaying 20 results from an estimated 7000 matches similar to: "return(x=x,y=y,prob=prob) hasn't been used in R now?"
2012 May 22
4
“For” calculation is so slow
Dear All,
The function I wrote can run well with the small data, but with the large
data, the function runs very very slowly. How can I correct it? Thank you
very much. My function as below:
a<-c(1:240)
b<-c(1:240)
l=function(a,b){
v=0
u=0
uv=0
v[1]=0
u[1]=0
uv[1]=0
for (i in 1:(length(s)-1)){
v[i]<-((gx[[i]][b,(gx[[i]][a,1]+1)])-(gx[[i]][a,gx[[i]][a,1]+1]))/(gx[[i]][a,gx[[i]][a,1]+1])
2011 Nov 25
1
Multiple selection, renaming and saving the results
Dear all,
I have a
big data frame:
str(data1)
'data.frame': 18272 obs. of 11 variables:
$ tag :
int 100001 100002 100003 100005 100007
100008 100009 100011 100012 100014 ...
$ sp :
Factor w/ 18 levels "acassp","acocar",..: 13 5 7 14 14 18 3
11 13 10 ...
$ gx :
num 20 10 35 68 88 63 123 115 137 136
...
$ gy :
num 30 25 24 1 10 40 45 25 23 45 ...
2009 Jul 06
1
how to apply a self-written function to a data frame
Hello,
I have written a function in order to analyse gaze paths. It works with the test data but when I try to apply the function to a data frame that stores "the real data" in columns I receive the error message that the
" In if (pp > 1) { :
condition has length > 1 only the first element will be used
"
I interpret this error message as saying that only the first
2007 Dec 13
1
Probelms on using gam(mgcv)
Dear all,
Following the help from gam(mgcv) help page, i tried to analyze my
dataset with all the default arguments. Unfortunately, it can't be run
successfully. I list the errors below.
#m.gam<-gam(mark~s(x,y)+s(lstday2004)+s(slope)+s(ndvi2004)+s(elevation)+s(disbinary),family=binomial(logit),data=point)
2007 Sep 13
2
handle dates in R?
Dear Rusers,
I have some data in .csv file like "2004-8-1" and "2004-10-1", and i need
to convert them into days from the origin (January 1, 1960).
I have tried the function date.mmddyyyy(), but cannot get it. Anybody can
show me how to handle the date data?
Thanks very much!
My dataset like:
time
2004-8-1
2004-10-1
2001-9-1
2002-9-1
--
With Kind Regards,
2006 Jun 14
1
Estimate region of highest probabilty density
Estimate region of highest probabilty density
Dear R-community
I have data consisting of x and y. To each pair (x,y) a z value (weight) is assigned. With kde2d I can estimate the densities on a regular grid and based on this make a contour plot (not considering the z-values). According to an earlier post in the list I adjusted the kde2d to kde2d.weighted (see code below) to estimate the
2007 Oct 02
2
How to add legend for image()?
Dear friends,
The following is an example to explain my question. I want to get a
legend which will show the z-values according to different colors in image()
function.
x<-sort(runif(10)) #x-coordinates
y<-sort(runif(10)) #y-coordinates
z<-matrix(runif(100),nrow=10) #attributes values
image(x,y,z,col=gray((6:3)/6))
# legend(x,y,legend=z,col=gray((6:3)/6)) #error. the colors should
2008 Sep 23
3
Generating series of distributions with the same skewness and different kurtosis or with same kurtosis and different skewness?
Dear R users,
I hope to explain the concepts of skewness and kurtosis by generating
series of distributions with same skewness and different kurtosis or with
same kurtosis and different skewness, but it seems that i cannot find the
right functions.
I have searched the mailing list, but no answers were found.
Is it possible to do that in R? Which function could be used?
Thanks a lot.
--
2007 Nov 08
2
question on image() function?
Dear friends,
My dataset is like the following:
x y mcpvalue
0.4603578 0.6247629 1.001
0.4603715 0.6247788 1.001
0.4603852 0.6247948 1.001
0.4110561 0.5664841 0.995
The x and y variables are unsorted.
I use the function image(x,y,mcpvalue) to generate a plot, but the error
is that "increasing 'x' and
2007 Sep 17
2
What's the corresponding function in R for lo() function in S-PLUS?
Dear friends,
In S-PLUS, we can use the following argument, but not in R.
mode12 <- gam(score1 ~ lo(latitude) + lo(longitude))
I searched the help in S-PLUS, it says lo() Allows the user to specify a
Loess fit in a GAM formula, but i didn't find the correponding function in
R.
Anybody knows how to do the similar task in R?
Thanks very much.
--
With Kind Regards,
oooO:::::::::
2007 Aug 17
3
Is there any good tools to facilitate us to create R functions?
Dear R users,
We have some programs for the specific task in our research, but they were
very commonly used. We want to make some functions for them, anybody can
recommend any good tools to facilitate us to create R functions even without
going deep into the theories of R functions ?
Any suggestions or help are greatly appreciated.
--
With Kind Regards,
oooO:::::::::
(..):::::::::
2011 Feb 15
1
gList and gTree methods of grid::grobX
Dear all,
In an attempt to draw fill patterns in grid graphics, I have
encountered a behavior of grobX that I cannot understand from the
documentation. Consider this,
library(grid)
## gTree
g1 <- gTree(children=gList(
rectGrob(0.5,0.5, width=unit(0.8,"npc"),
height=unit(2,"cm")),
circleGrob(r=0.3)), vp=viewport(0.5,0.5))
##
2008 Jan 01
3
Specify a correct formula in R for Piecewise Linear Functions?
Dear all,
I have two variables, y and x. It seems that the relationship between them
is Piecewise Linear Functions. The cutpoint is 20. That is, when x<20, there
is a linear relationship between y and x; while x>=20, there is another
different linear relationship between them.
How can i specify their relationships in R correctly?
# glm(y~I(x<20)+I(x>=20),family = binomial, data =
2007 Oct 12
3
Anybody has ever met the problem to add a legend to a figure generated by image()?
Dear friends,
Anybody has ever met the problem to add a legend to a figure generated by
image()? I have three variables,x,y and z.
x and y are the coordinates, and z is the third values. we can use image(x,
y, z,...) to generate a figure according to the z-values, but the problem is
the figure legend. How can the legend be added to a figure generated
by image()? Note that filled.contour() can
2009 Jun 26
1
gradient fill of a grid.polygon
Dear list,
Following a recent enquiry, I've been playing with the idea of creating a
colour gradient for a polygon, using the Grid package. The idea is to draw a
number of stripes of different colours, using the grid.clip function. Below
is my current attempt at this,
library(grid)
rotate.polygon <- function(g, angle=0){ # utility function, works fine
matR <- matrix(c(cos(angle),
2007 Dec 31
2
help on ROC analysis
Dear all,
Some functions like 'ROC(Epi)' can be used to perform ROC analyssi, but it
needs us to specify the fitting model in the argument. Now i have got the
predicted p-values (0,1) for the 0/1 response variable using some other
approach, see the following example dataset:
id mark predict.pvalue
1 1 0.927
2 0 0.928
3 1 0.928
..................
2007 Jun 01
1
How should i get the quantile 2.5 % and 97.5% in each row of a matrix?
Dear friends,
I need the get the 2.5% and 97.5% quantile from each row of a matrix, how
should i get it?
BTW, i can get the min/max value from each row of a matrix, using the
following programs, is there an easy function to do it?
simmin<-matrix(NA,nrow=47,ncol=1)
for (i in 1:47) {
simmin[i,]<-min(datas[i,])
}
Thanks for your help.
--
With Kind Regards,
oooO:::::::::
2007 Aug 25
1
How can i inhibit this work "Please select a CRAN mirror for use in this session "?
Dear Rusers,
When i start R, there always the following work to do first, how should i
cancel it?
*--- Please select a CRAN mirror for use in this session ---*
I don't know why it does so, maybe i have done something unintentionally.
Thanks.
--
With Kind Regards,
oooO:::::::::
(..):::::::::
:\.(:::Oooo::
::\_)::(..)::
:::::::)./:::
::::::(_/::::
:::::::::::::
2007 Sep 14
1
Calculate the angles for a point dataset?
Dear Rusers,
I'd like to take the cases of cancer of the larynx in chorley(spatstat) to
explain my question.
I want to join the points of cancer of the larynx with the disused
industrial incinerator to generate lines, and then calculate the angles of
these line comparing the horizontal line?
How can i get it? It seems to be difficult to get the angles
Thanks a lot.
--
With Kind
2007 Sep 22
0
How to explain the meaning of mu in the variance function of GLMs?
Dear R friends,
When fitting GLMs in R, we may need to specify the variance function to do
our analysis. I had thought it's the mean value, but it seems not. Could
anybody expain the correct meaning of *mu* in the variance function of
GLMs? The following content is from the R-hlep.
variance for all families other than quasi, the variance function is
determined by the family. The quasi