similar to: maptools sunrise sunset function

I have looked at ?as.POSIXct ?POSIXct and many of the references that are on those pages. I am bewildered with timezones. Is there a way to get what would go into tz="" for making a function that uses POSIXct to be able to be used in all of the timezones in just the united states? This is for both windows and mac... this is the function that I am wanting to use it with

# I am sure that I could be more efficient than this but how? Thanks in advance. #GPS in Decimal Degrees in the form longitude latitude RM215 <- matrix(c(-82.1461363, 33.5959109), nrow=1) SC <- matrix(c(-82.025888, 33.606454), nrow=1) RM202 <- matrix(c(-81.9906723, 33.5027653), nrow=1) RM198 <- matrix(c(-81.926823, 33.4634678), nrow=1) HC <- matrix(c(-81.920505, 33.46192), nrow=1)

Are there any functions available to calculate sunrise and sunset times for given latitude,longitude and dates? If not, I'll appreciatte any pointers to C code I could use/port. Thanks, Angel

Hi ... I wonder if anyone can provide some insight into why the first three examples using the sunriset function (appended below, with results) give the correct answer, but the fourth generates and error. The first two use ISOdatetime with and without a time zone attribute, and the sunriset function returns the correct sunset time. The third and fourth adds 10 seconds to the ISOdatetime

RM215.sp <- SpatialPoints(RM215, proj4string=CRS("+proj=longlat +datum=WGS84")) d060101 <- as.POSIXct("2006-01-01", tz="EST") study_seq <- seq(from=d060101, length.out=761, by="days") up.215 <- sunriset(RM215.sp, study_seq, direction="sunrise", POSIXct.out=TRUE) down.215 <- sunriset(RM215.sp, study_seq, direction="sunset",

Does anyone know if there is a sunrise sunset calculator for R? -- Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis [[alternative HTML version deleted]]

Hello all, After beating my head against the wall for a few hours, I give up. I have two problems. 1. If I use seq() to generate a POSIXct series that crosses a daylight savings to stardard time change I get two values for the first day of change. The time change is Nov 6,2011. The value for Nov 7 turns into 23:00 on Nov 6, thus two values for Nov 6. (see below) So I put a time value (noon)

Hello, I'm having problems working with date values in POSIXct format. Here is what I got (eg.lig attached): x <- read.table("eg.txt", sep = ',', col.names=c("ok","time","secs","lig")) # it gives time as factor z <- cbind(x,colsplit(x$time, split="\\s", names=c("date", "clock")))

hi there, does anyone know how to calculate the amount of daylight on every day of the year in R? I mean the time between sunrise and sunset. thanks -- View this message in context: http://r.789695.n4.nabble.com/daylight-tp4647213.html Sent from the R help mailing list archive at Nabble.com.

Hi, I have a data.frame that contains a variable act which records the duration (in seconds) of two states (wet-dry) for several individuals (identified by Ring) over a period of time. Since I want to work with daytime (i.e. from sunrise till sunset) and night time (i.e. from sunset till next sunrise), I have to split act from time[i] till sunset and from sunset until time[i+1], and from time[k]

Hello to all, I have two dataframes, the first with two columns sunrise and sunset (for 10 years). Each of these columns is formatted for date time (ex: 01-Jan-2010 15:37:00) In the second data frame I have GPS information and also a date time column (same format ). What I would like to do is a subset of all the rows from the second dataframe that occurred in day time only so between sunrise

Dear R helpers, I have a dataframe (test1) containing the time of sunrise and sunset for each day of the year for 3 years. I have another dataframe (test2) containing measurements that are taken every 15 minutes, 24/7. I would like to extract all rows from test2 that occur between sunrise and sunset for the appropriate date. Can you suggest a good vectorized way to do this? Keep in mind

Dear List, I am trying to find each time a value changes in a dataset. The numbers are variables for day vs. night values, so what I am really getting is the daily sunrise and sunset. A simplified example is the following: x<-seq(1:100) y1<-rep(1,10) y2<-rep(2,10) y<-c(y1,y2,y1,y1,y1,y2,y1,y2,y1,y2) xy<-cbind(x,y) I would like to know each time the numbers change. Correct

Hey guys, I got Money Plus Deluxe Sunset working without ever seeing this thread, but these are the same to issues I had to conquer. I posted these on my AppDB test data submission as well, but thought I'd post it here for your convenience (if you're still trying to get it to work, that is). 1st, the dialog box on each page load; Solution: use winetricks ie8 instead of ie6 2nd, the app

I've gotten Microsoft Money Sunset running under wine following the instructions here... http://appdb.winehq.org/objectManager.php?sClass=version&iId=21030 Application runs fine for the most part. But I'm having two problems. Money must use some internal web thingy (technical term) and uses it for it's pages. Every time it starts up, I need to open them. I'm thinking that

I am very new to R and programming and thank you in advance for your patience and help with a complete novice! I am working with a large multivariate data set that has 10 explanatory environmental variables (e.g. temp, depth) and over 60 response variables (each is a separate species). My data frame is set up like the simplified version below: JulianDay Temperature Salinity Depth Copepod

Hi all, Eons ago (~2007) Hadley Wickham extremely generously helped me developed a means for plotting temporal activity w/ ggplot. I need to revisit this and have it working again.? I failed to copy the entire legacy code over to my traveling laptop from my workstation, but found a partial bit of the code in an old 2009 Gmail attachment.? I am slated to do a graduate seminar at UF G'ville

Hi We have two subnets with routing tables correctly set up so they can both ping to our Sun Solaris Box. 193.71.221 191.9.211 The Sun Solaris box lives on 193.71.221.1 and all PCs on that subnet can map to the Sun box without any problems. All PCs on the 191.9.211 cannot connect to the samba drives giving the error "Network not Found". Any help would be much appreciated. Thanks

In order to make it shut down properly you may try the following. In Wine configuration , "Graphics" tab, check "Emulate a virtual desktop". Now all wine porgrams will be opened "inside" or "above" a Windows' blue desktop area. Now when you want to shutdown MS Money, use mouse right-click on the task bar -> "Close", instead of Money window

Okay, I found the right ahsetup.exe (Active Home). It's doing the same thing for me: extracting CloseApp.exe (which is the same program I found) to the temp folder, but then shutting down with an error message about being unable to use it. As to why, the answer, IMO, is that this is a very old program (the download site says it works in Windows 3.1), and most programs that old simply