similar to: insert a dot to the numbers

Hi all, rmvnorm()can be used to generate the random numbers from a multivariate normal distribution with specified means and covariance matrix, but i want to specify the correlation matrix instead of covariance matrix for the multivariate normal distribution. Does anybody know how to generate the random numbers from a multivariate normal distribution with specified correlation matrix? What about

Hi all, Today, i just installed the newest R version 2.10.1 and other necessary tools for building R package under windows,e.g. Rtools, perl. All are the newest version. After the correct configuration under windows, i use it to re-check my old package. I found the following prolem when checking EXAMPLE, which did not exist before this re-installation. ######## * checking examples ... ERROR

Hi All, I met a problem using readLines function to return the data from Google maps. readLines(url(" http://ditu.google.cn/maps/geo?q=+qianshuichong,+guichi+anhui,+CN&output=csv&key=ABQIAAAAq8Fnd_oUka-7RdS6BrD7GBTqeABoQuNTXS36G_rkiwQnKRW6GBTkns8JpKz6y6dScgB8827dlddUlg"), n=1, warn=FALSE) [1] "200,4,30.6528380,117.4872250" The above code is ok because the

Hi Rusers, I hope to divide the original dataset into several subsets and output these multilple datasets. But errors appeared in my loops. See example. ###### a<-c(1:10) b<-c(rep(1,3),rep(2,3),rep(3,4)) c<-data.frame(a,b) #c is the example data num<-c(unique(b)) # I hope to get the subsets c_1.csv,c_2.csv and c_3.csv #Errors for (i in num) { c_num<-c[c$b==num,]

Hi all, I want to put several figures in a one figure for easy comparison, so i need to use the same methods to plot these figures. The following is an example. I also list my method, but it does not work. #Example data x<- 1:10; y<- 1:10; z<- outer( x,y,"+");z2<- outer( x,y,"-") #Quick view them image.plot(x,y,z) #relatively larger value image.plot(x,y,z2)

Hi, I got two errors after i checking my package. The errors are as follows, Error1: * checking for unstated dependencies in R code ... WARNING 'library' or 'require' calls not declared from: boot np Error2: * checking R code for possible problems ... NOTE myfunction: no visible global function definition for 'npudensbw'in the np package In "myfunction", i

Hi, I just cannot remember the R function to divide a dataset into equal parts. And i searched the "divide dataset into equal parts" in R site, but cannot find it. Anybody can tell me that function. I am just blocked by it. Thanks a lot. -- ----------------- Jane Chang Queen's [[alternative HTML version deleted]]

Hi, See my example below. a<-array(1:12,c(2,3,2)) > a , , 1 [,1] [,2] [,3] [1,] 1 3 5 [2,] 2 4 6 , , 2 [,1] [,2] [,3] [1,] 7 9 11 [2,] 8 10 12 I want to get a result something like dim1 dim2 dim3 elements 1 1 1 1 2 1 1 3 2 2 1 2 I tried the data.frame and expand.grid functions,

Hi, I am using split function and wonder how to add the factor to the splitted results. #Example n <- 3; nn <- 10 g <- factor(round(n * stats::runif(n * nn))) #factor x <- rnorm(n * nn) + sqrt(as.numeric(g)) #value xg <- split(x, g) xg $`0` [1] 0.82513702 -0.03911584 2.32955347 0.36745335 1.75572642 2.65461438 0.41675829 $`1` [1] 0.8583493 2.4264804 -0.3622378

Hi, I read some posts from the mailing list on the same problem, but it seems that i still cannot solve this problem. I only want to generate some simulated data. #Generate 2500 observations-it works without errors > coords<-as.matrix(expand.grid(seq(0,100,length.out=50), seq(0,100,length.out=50))) #SimData is a user-written function > SimBinData<-SimData(n=2500,coords=coords,

Hi all, I found the date format (e.g."%d/%m/%Y") in the .rd file cannot be displayed after building the package. See below, ###.rd file#### \examples{ a<-"10/20/1999" DateConversion(a,DateIn="%m/%d/%Y",DateOut="%d/%m/%Y") } ####The result is #### Examples: a<-"10-20-1999" DateConversion(a,DateIn=" ??"%m/%d/%Y"

Hi Rusers, I found sometimes that the same values cannot be judged to be the same in R. Anybody knows the probelm? I think i ignored some minor detail. Thanks. Here is the example. ############ data1<-matrix(data=c(1,1.2,1.3,"3/23/2004",1,1.5,2.3,"3/22/2004",2,0.2,3.3,"4/23/2004",3,1.5,1.3,"5/22/2004"),nrow=4,ncol=4,byrow=TRUE)

Hi, I know we can use 1:10 to represent the 1,2,3,...,10 numbers, but the following conditions are except. Anybody knows how to represent the following two cases with similar usage of ":" or others? Usually, i will get several hundred names for them, such as a1,a2,... or f[[1]],f[[2]],... #Example data a1<-array(1:12,c(2,3,2)); a2<-array(2,c(2,3,2)); a3<-array(0,c(2,3,2))

Hi, In the following function, i hope to save my simulated data into the "result" dataset, but why the final "result" dataset seems not to be generated. #Function simdata<-function (nsim) { result<-matrix(NA,nrow=nsim,ncol=2) colnames(result)<-c("x","y") for (i in 1:nsim) { set.seed(i) result[i,]<- cbind(runif(1),runif(1)) }

Hi, Say i have three functions in a new package, a,b and c. I only want the one function "a" to be exported for use. "b" and "c" are not very stable. If i specify to export all the three functions in the NAMESPACE file (export(a,b,c)), no errors appeared after checking the package. And i am sure there should be no errors. But if i only export the one function

Hi, See example. for (i in 1:2) { for (j in 1:3) { b_1[i,j]<-rank(c(a1[i,j],a2[i,j],a3[i,j]))[1] b_2[i,j]<-rank(c(a1[i,j],a2[i,j],a3[i,j]))[2] b_3[i,j]<-rank(c(a1[i,j],a2[i,j],a3[i,j]))[3] } } The inner codes is really repeated, so i want to change the inner codes into loops. Take nn is from 1 to 3, something like, for (nn in 1:3) {

Hello, See my problem below. a<-data.frame(c("s","c","c","n","n","n"),c(rep(1,3),rep(2,3)),c(rep(2,3),rep(1,3)),c("01/01/1999","10/02/2000","13/02/2000","11/02/2000","15/02/2000","23/02/2000"))

Hi all, My problem may be related with the list manipulations. See below. #example data a<-list() a[[1]]<-data.frame(matrix(c(1:4),ncol=2)); a[[2]]<-data.frame(matrix(c(5:8),ncol=2)) I can use a[[1]]$X1,a[[1]]$X2,a[[2]]$X1,a[[2]]$X2 to use the corresponding variables. But what i need to do is to use function parameters to specify the variable names. The variable names will be

Hi all, Today, i just installed the newest R version 2.10.1 and other necessary tools for building R package under windows,e.g. Rtools, perl. All are the newest version. After the correct configuration under windows (configuration should be correct), i use it to re-check my old package. I found the following prolem when checking EXAMPLEs in each function, which did not exist before this

Hi, I wrote my own function to finish my work. One strange thing happened. If i set the number of simulations to be "10", it goes correctly. But if i set the number of simulations into "100", then errors appeared. Error information: The instruction at "0x6abf12cf" referenced memory at "0x0286fff8". The memory could not be "read". Anybody met