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I have a program, when I write if(num!=NA) it yields an error message. However, if I write if(is.na(num)==FALSE) it works. Why doesn't the first statement work? Thanks, Miao [[alternative HTML version deleted]]

Example: Will ts objects be obsolete or modified? > a [,1] 1983 Q1 2.747365190 1983 Q2 2.791594762 1983 Q3 -0.009953715 1983 Q4 -0.015059485 1984 Q1 -1.190061246 1984 Q2 -0.553031799 1984 Q3 0.686874720 1984 Q4 0.953911035> lag(a,4) [,1] 1983 Q1 NA 1983 Q2 NA 1983 Q3 NA 1983 Q4 NA 1984 Q1 2.747365190 1984 Q2

...s running, the "idle=poll" kernel option was added to simulate a busy guest. The entry "unfair + PV qspinlock" below means that both the unfair lock and PV spinlock configuration options were turned on. AIM7 XFS Disk Test (no overcommit) kernel JPM Real Time Sys Time Usr Time ----- --- --------- -------- -------- PV ticketlock 2489626 7.23 101.08 5.30 qspinlock 2531646 7.11 100.75 5.43 PV qspinlock 2500000 7.20 101.94 5.40 unfair...

..."ABCD", how can I access the second element of the string "B"? Thanks, Miao 2012/7/27 Daniel Nordlund <djnordlund@frontier.com> > > -----Original Message----- > > From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-project.org] > > On Behalf Of jpm miao > > Sent: Thursday, July 26, 2012 9:12 PM > > To: r-help > > Subject: [R] How can I access the title of a table read via read.csv? > > > > Hi, > > > > I have a table which I can read via read.csv: > > > > fx1<-read.csv(file="A_FX...

Hi jpm miao, You can get CSV files that can be imported into Excel like this: library(prettyR) sink("excel_table1.csv") delim.table(table(df[,c("y","z")])) sink() sink("excel_table2.csv") delim.table(as.data.frame(table(df[,c("y","z")])),label=&...

Hello, I have a question on how to tabulate the time series data. I use RStudio, but if can be done in any other R editor, it should work in RStudio as well. > a1<-11:22 > a1ts<-ts(a1, frequency=4, start=c(1978,1)) > a1ts Qtr1 Qtr2 Qtr3 Qtr4 1978 11 12 13 14 1979 15 16 17 18 1980 19 20 21 22 If I click the variable "a1ts" on the

Hi, How could we print the frequency table (produced by "table") to an Excel file? Is there an easy way to do so? Thanks, Miao > df <- data.frame(x = 1:3, y = 3:1, z = letters[1:3]) > table(df[,c("y","z")]) z y a b c 1 0 0 1 2 0 1 0 3 1 0 0 > test<-table(df[,c("y","z")]) > as.data.frame(test) y z Freq 1 1 a

Hello, I have problem running the histogram function "hist". The area under the histogram is much lower than 1. Could anyone tell me what the problem is? Thanks, (The total number of observation is 992 (close to 1000), so the probability that 0<Y1<35 is approximately 0.277) miao rm(list=ls()) par(mfrow=c(1, 1)) Y <- cbind(matrix(35*0.5,1,277), matrix(35*1.5, 1, 146),

...run and its performance data were recorded. With two VMs running, the "idle=poll" kernel option was added to simulate a busy guest. If PV qspinlock is not enabled, unfairlock will be used automically in a guest. AIM7 XFS Disk Test (no overcommit) kernel JPM Real Time Sys Time Usr Time ----- --- --------- -------- -------- PV ticketlock 2542373 7.08 98.95 5.44 PV qspinlock 2549575 7.06 98.63 5.40 unfairlock 2616279 6.91 97.05 5.42...

...run and its performance data were recorded. With two VMs running, the "idle=poll" kernel option was added to simulate a busy guest. If PV qspinlock is not enabled, unfairlock will be used automically in a guest. AIM7 XFS Disk Test (no overcommit) kernel JPM Real Time Sys Time Usr Time ----- --- --------- -------- -------- PV ticketlock 2542373 7.08 98.95 5.44 PV qspinlock 2549575 7.06 98.63 5.40 unfairlock 2616279 6.91 97.05 5.42...

HI, I have a dataframe with two variable A, B. I transform the two variable and name them as C, D and save it in a dataframe dfcd. However, I wonder why can't I call them by dfcd$C and dfcd$D? Thanks, Miao > A=c(1,2,3) > B=c(4,6,7) > dfab<-data.frame(A,B) > C=dfab["A"]*2 > D=dfab["B"]*3 > dfcd<-data.frame(C,D) > dfcd A B 1 2 12 2 4 18

Hi, I conduct a panel data estimation and obtain estimators for two of the coefficients beta1 and beta2. R tells me the mean and covariance of the distribution of (beta1, beta2). Now I would like to find the distribution of the quotient beta1/beta2, and one way to do it is to simulate via the joint distribution (beta1, beta2), where both beta1 and beta2 follow t distribution. How could we

...the performance benefit of this patch, I ran the high_systime workload (which does a lot of fork() and exit()) at various load levels (500, 1000, 1500 and 2000 users) on a 4-socket IvyBridge-EX bare-metal system (60 cores, 120 threads) with intel_pstate driver and performance scaling governor. The JPM (jobs/minutes) and execution time results were as follows: Kernel JPM Execution Time ------ --- -------------- At 500 users: 3.19 118857.14 26.25s 3.19-qspinlock 134889.75 23.13s % change +13.5% -11.9%...

...the performance benefit of this patch, I ran the high_systime workload (which does a lot of fork() and exit()) at various load levels (500, 1000, 1500 and 2000 users) on a 4-socket IvyBridge-EX bare-metal system (60 cores, 120 threads) with intel_pstate driver and performance scaling governor. The JPM (jobs/minutes) and execution time results were as follows: Kernel JPM Execution Time ------ --- -------------- At 500 users: 3.19 118857.14 26.25s 3.19-qspinlock 134889.75 23.13s % change +13.5% -11.9%...

...ons needed by the queue spinlock PV code. Two KVM guests of 20 CPU cores (2 nodes) were created for performance testing. With only one KVM guest powered on (no overcommit), the disk workload of the AIM7 benchmark was run on both ext4 and xfs RAM disks at 3000 users on a 3.14-rc6 based kernel. The JPM (jobs/minute) data of the test run were: kernel XFS FS %change ext4 FS %change ------ ------ ------- ------- ------- PV ticketlock (baseline) 2409639 - 1289398 - qspinlock 2425876 +0.7% 1291248 +0.1% PV...

...Now I want to know how I can find out the column names of the zoo objects? In case of more than one time series, the function "colnames" works, but not for the univariate time series. Thanks, Miao 2012/8/9 Achim Zeileis <Achim.Zeileis@uibk.ac.at> > On Thu, 9 Aug 2012, jpm miao wrote: > > Hi, >> >> Part of my program is to calculate the number of time series in a zoo >> object. It works well if it has more than one time series, but it fails if >> it has only one. How can I access the number of column (i.e. the number of >> time...

Hello, Let us convert a vector to a time series object starting in 1978Q1: FRW<-ts(FRW0, frequency=4, start=c(1978,1)) FRW[3:6] represents the data from 1978Q3 to 1979Q2. Could we access the data by the time (1978Q3 to 1979Q2) instead of FRW[3:6]? Thanks, miao [[alternative HTML version deleted]]

Hello, I am using RStudio and have trouble finding out the problematic line in the presence of a bug. Could I view the line NUMBER which contains a bug? Is there any R editor able to do it? Thanks, Miao [[alternative HTML version deleted]]

Hello, I would like to find the maximum element in a matrix or an array but it does not return what I want. For example, If I have a 2*2 matrix A whose maximum element is the A(1,2). I would like the answer (1,2), but it returns 3, which is the ordinal if one counts by columns. Is there any function that returns (1,2)? Thanks > A<-rbind(c(1,4), c(3,2))> A [,1] [,2] [1,]

Hi, I am using xylot function in Lattice package. I find it excellently written, but I don't know how to find resources on this function. One thing I would like to change is the line type. To my knowledge, type ="l" means a regular line, type "g" means broken lines, but I can't find a complete list of the choices. The info obtained from the query in R is limited.