similar to: time difference

Hi, I've got a csv format of file. There are seven columns of variables all together, and I've used the diff() function to take the differences between the variables in one column. Now I want to add the differences as the 8th column variable to the csv file. Is there any way that I can do this? Thanks in advance. Carol Gao [[alternative HTML version deleted]]

Hi there, I've got a column vector in a csv file as follows, and I need to add 11 hours to each of them. Is there a way that I can do it? (The actual file size is much bigger than this.) Time "01-DEC-2008 00:00:28.611" "01-DEC-2008 00:00:43.155" "01-DEC-2008 00:01:06.677" "01-DEC-2008 00:01:06.677" "01-DEC-2008 00:01:06.677" "01-DEC-2008

I'm trying to proess date/time fields from files that were given to me to analyze. Any clues what I'm doing wrong with strptime? This seems to fail the same way under Linux or Windows. For ?strptime would it make sense to explain %OS3 somewhere besides the Examples? > # Why does %OS3 work here? > format(Sys.time(), "%H:%M:%S") [1] "16:45:19" >

I read a dataset with times in them, e.g., "09:31:29.18761". I then parse them: > all$X.Time <- strptime(all$X.Time, format = "%H:%M:%OS6"); and get a vector of NAs (how do I check that except for a visual inspection?) then I do > options("digits.secs"=6); > all$X.Time <- strptime(all$X.Time, format = "%H:%M:%OS"); and it, apparently, works:

Dear R users, When I was trying to use the function *optim* to get the MLEs, quite a few warning messages showed up as below: Warning in log(psi * lam) : NaNs produced I am just wondering what does this mean? Was it something wrong with my likelihood function or was it sth wrong with the data? Thanks in advance. Carol Gao [[alternative HTML version deleted]]

Dear R list, I have a function specifying my log-likelihood, and now I need to set the constraint that *alpha > kappa*, could anyone help me with setting this in my function? the function is defined as follows: mll <- function(param){ n <- length(x) psi <- numeric(n) psi[1] <- 1.0 a0 <- exp(param[1]); a1 <-exp(param[2]); b1 <- exp(param[3]); *alpha *<-

Dear R lists, Would anyone help me with setting data frames according to the date? X.RIC Date.G. Time.G. GMT.Offset Type Price Volume Time 1 QAN.AX 01-DEC-2008 00:00:28.611 11 Trade 2.28 105 2008-12-01 11:00:28.611 2 QAN.AX 01-DEC-2008 00:00:43.155 11 Trade 2.28 250 2008-12-01 11:00:43.155 3 QAN.AX 01-DEC-2008 00:01:06.677 11

Hi all, I have never worked with this kind of data before, so Please help me out with it. I have the following data set, in a csv file, looks like the following: Jan 27, 2010 16:01:24,000 125 - - - Jan 27, 2010 16:06:24,000 125 - - - Jan 27, 2010 16:11:24,000 176 - - - Jan 27, 2010 16:16:25,000 159 - - - Jan 27, 2010 16:21:25,000 142 - - - Jan 27, 2010 16:26:24,000 142 - - - Jan 27, 2010

R help on 'strptime' has the following in "Details" section. Specific to R is ?%OSn?, which for output gives the seconds truncated to ?0 <= n <= 6? decimal places (and if ?%OS? is not followed by a digit, it uses the setting of ?getOption("digits.secs")?, or if that is unset, ?n = 3?). In reality, for output, if '%OS' is not followed by a digit and

Hi, I cannot figure out how to change the index format when displaying POSIXct objects. Would like the xts index to display as %H:%M:%OS3 when doing viewing the xts object. Think I am missing the obvious. Cheers, Chris -- View this message in context: http://r.789695.n4.nabble.com/xts-POSIXct-index-format-tp3336136p3336136.html Sent from the R help mailing list archive at Nabble.com.

Does R have support for microseconds in timestamps, e.g. when reading this in "Time","Include","Kind","Duration" 2011-04-01 14:20:36.368324,Y,U,1.03238296509 2011-04-01 14:20:35.342732,Y,C,0.0252721309662 2011-04-01 14:20:34.337209,Y,R,0.00522899627686 Thanks, Joel -------------------------------------------------------------------------- - for hire: mac

Hello, It might be an easy question but if you have many variables to fit in the lm function, how do you take all without specifying var1+var2+...+var2100 in the terms parameter in response ~ terms? Cheers, Carol

Hi, What is the function for inverse normal transformation? Thanks, Carol [[alternative HTML version deleted]]

Hi, I got problem in using title function to create a title for multiple plots presented together by par. As can be seen in the attached file, the title is displayed truncated and the subtitle doesn't get displayed. Here is the code: par(mfrow = c(1,2)) plot(c(1,2,3), c(9,8,7)) plot(c(1,2,3), c(9,8,7)) title(main = "Main title", sub ="Sub title",outer = TRUE,

I have a time stamp in UTC (GMT) time: > format(ISOdatetime(1970,1,1,0,0,0)+1165398135729/1000,"%Y-%m-%d %H:%M:%OS3") "2006-12-06 09:42:18.823" (note millisecond accuracy, but not relevant to question here) Now, this time stamp actually "happened" at local (Swedish) time one hour later (10:42). Regarding summer/winter adjustments in time ("spring

It seems that there is a problem in displaying subtitle in general, independently from multi-plot display. when I do plot (c(1,2,3), c(9,8,7), type = "l") title(main = "Main title", sub ="Sub title",cex.main=2, cex.sub = 2) subtitle doesn't get displayed > --- On Sat, 11/21/09, David Winsemius <dwinsemius at comcast.net> > wrote: >

Hi, How to plot the same types of graphics on the same R graphic device? Suppose that we want to plot a vector y against x (using plot for instance). How is it possible to plot y against x for different values of these two vectors on the same device so that the plots could be compared? Cheers, Carol [[alternative HTML version deleted]]

Hi, We could use qqplot to see how two distributions are different from each other. To show better how they are different (departs from the straight line), how is it possible to plot the straight line that goes through them? I am looking for some thing like qqline for qqnorm. I thought of abline but how to determine the slope and intercept? Best wishes, Carol

Have UI that simplifies running code from another (internal) package, allowing user to set values on fields I basically grabbed from results of calls to formals() for various functions. That works fine for the most part. But it was requested to investigate some type of popup help or something for each field. Since I already wrote the information in the dot-Rd files for what should be displayed,

I'm trying to use samba to serve a number of home directories to other samba Linux clients on my network. ie. I have a set of client machines that want to use the /home directory that my samba server will provide I thought I could set up a share that goes something like this [homedirs] path = /home writable = true On a client machine, I smbmount //myserver/homedirs