similar to: Problem with fractional seconds

Dear List, I am having a problem with dates and I would like to understand what is going on. Below is an example. I can produce a date/time using as.POSIXct, but I am trying to combine two as.POSIXct objects and keep getting strange results. I thought I was using the wrong origin, but according to structure(0,class="Date") I am not (see below). In my example a is a simple date/time

Dear List, I need some help in coming up with a function that will take two data sets, determine if a value is missing in one, find a value in the second that was taken at about the same time, and substitute the second value in for where the first should have been. My problem is from a fish tracking study. We put acoustic tags in fish and track them for several days. Location data is supposed

Dear List, I would like to create several graphs of similar data. I have x and y values for several different individuals (in this case fish). I would like to plot the x and y values for each fish separately. I can do it using a for loop, but I think I should be using "apply". Please let me know what I am doing wrong, or if there is a "better" way to do this. What I have

Dear All, Need some help as I was trying to follow the guide below. https://wiki.samba.org/index.php/Samba4/HOWTO/Join_a_domain_as_a_DC Until the steps of ldbsearch -H /usr/local/samba/private/sam.ldb '(invocationid=*)' --cross-ncs objectguid and my ldbsearch reply with such a result. ldb: unable to dlopen /usr/lib64/samba/ldb/acl.so : /usr/lib64/ldb/libreplace.so: version

Hello everybody When one is working with complex matrices, "transpose" very nearly always means *Hermitian* transpose, that is, A[i,j] <- Conj(A[j,i]). One often writes A^* for the Hermitian transpose. I have only once seen a "real-life" case where transposition does not occur simultaneously with complex conjugation. And I'm not 100% sure that that wasn't a

Can anybody give me a hint why as.POSIXlt doesn't recognize the same timezones that zdump knows about (Linux Suse 8.1 and Suse 7.3)? Is there a workaround? R : Copyright 2002, The R Development Core Team Version 1.6.1 (2002-11-01) R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under certain conditions. Type `license()' or `licence()' for

I have a dataframe ("mydf") that contains "differences of means". I wish to test whether these differences are significantly different from zero. Below, I calculate the t-statistic for each column. What is a "good" method to calculate/look-up the p-value for each column? mydf=data.frame(a=c(1,-22,3,-4),b=c(5,-6,-7,9)) mymean=mean(mydf) mysd=sd(mydf)

Dear List, I am trying to do model averaging for a negative binomial model using the package AICcmodavg. I need to use glm() since the package does not accept glm.nb() models. I can get glm() to work if I first run glm.nb and take theta from that model, but is there a simpler way to estimate theta for the glm model? The two models are: mod.nb<-glm.nb(mantas~site,data=mydata)

Hi all, I am currently using the code snippet below to minimize a function which I wasn't able to minimize properly with optim (cliffy surface, constraints, poles). Obviously this iteration is probably the poorest way of implementing such a function and it is expectedly slow. I've already written some vectorized functions, but I'm afraid that I'm missing the "big

Memdisk 2.08 cannot boot an XP boot floppy image (XP appears to use WinME boot files for its bootable floppy). For example: http://members.iinet.net.au/~bdriver/bootdisk/download.htm This disk will not boot with Memdisk (Memdisk starts to load the image and then hangs). I'm using Bart's tools to build a boot CD: http://www.nu2.nu/corpmodboot/ Which uses Isolinux and Memdisk.

Dear List, I am having a problem using gsub to remove dates from a date/time string. For example: x<-c("5/31/2009 12:34:00","6/1/2009 1:14:00") I would like to remove the date and have just the time. I have tried: gsub("[0-9+]/[0-9+]/[0-9+]","",x) and various versions. I think my problem is that the / is a special character and is telling it

Aloha all, I love using ggplot. It took a while to get used to the grammar of graphics, but it is starting to get easy now that I am thinking in a more structured way. A question. I'm making a wind rose that I'd like to be oriented with due north straight up. I've discovered that the orientation is sensitive to how north is represented. When north is represented as 0,

Hello, I would like to use my existing HST Saphir V S2M PCI with Asterisk. Unfortunately I could not find any information about the usage with Asterisk. Does someone know if it's possible to use it? Do I need to do something special? Regards Julian Pawlowski

Hello everybody! Still struggeling with my latest Samba setup, I've just run accross another problem which I can't figure out on my own. Samba is supposed to act as a WINS server (among other things) on a multihomed machine. (The Samba version is 3.5.1 as part of Debian Squeeze) Here's the [global] part of the samba setup: ----------------------------------- 8<

Hello everyone! After running Samba on several machines for some years, I just came accross a rather strange problem. The short story is that the special user home shares are readable, but not writeable. Here's the long story: The system is a freshly set-up Debian Squeeze, right out of the box. This is the Samba config: -------------------------------- 8<

Hello, I am work with a linear regression model: y=ax+b with the function of lm. y= observed migration distance of butterflies x= predicted migration distance of butterflies Usually the result will show if the linear term a is significantly different from zero based on the p-value. Now I would like to test if the linear term is significantly different from one. (because I want to know

Hello, everybody! I'm back to ask the obvious on behalf of the silent majority :) Today a student asked me "what standard error was used in this t.test output". I looked into it and was a little surprised that a t.test output object does not have a "slot" for the standard error. Of course, we can reconstruct the se=mu-hat/t, but I was surprised. Do you think it would

Dear List, Is there a color palette avaliable similar to what is used in satellite ocean color imagery? I.e. a gradient with blue on one end and red on the other, with yellow in the middle? I have tried topo.colors(n) but that comes out more yellow on the end. I am looking for something similar to what is found on the CoastWatch web page:

Hi, I have a large amount of data that I would like to create a histogram of and plot and do things with in R. It is pretty much impossible to read the data into R, so I have written a program to bin the data and now have a list of counts in each bin. Is it possible to somehow import this into R and use hist(), so I can, for instance, plot the probability density? I have looked at the help page

Dear List, I have a data frame of data taken every few seconds. I would like to subset the data to retain only the data taken on the quarter hour, and as close to the quarter hour as possible. So far I have figured out how to subset the data to the quarter hour, but not how to keep only the minimum time for each quarter hour. For example: