[R] Averaging dates?
Hi, What's the best way to average dates? I though mean.POISXct would work fine but... a [1] 2007-04-02 19:22:00 WEST b [1] 2007-03-17 16:23:00 WET class(a) [1] POSIXt POSIXct class(b) [1] POSIXt POSIXct mean(a,b) [1] 2007-04-02 19:22:00 WEST mean(b,a) [1] 2007-03-17 16:23:00 WET ?! Thanks in advance for any advice, -- Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] No years() function?
Hi, I'm trying to aggregate date values using the aggregate function. For example: aggregate(data,by=list(weekdays(LM),months(LM)),FUN=length) I would also like to aggregate by year but there seems to be no years() function. Should there be one? Is there any alternative choice? Also, a hours() function would be great. Any tip on this? Thanks in advance! Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Error in length of vector ?
Hi, I'm having a weird result with the length() function: a [... omited ...] [9994] NA2003-12-03 16:37:00 2002-06-26 18:43:00 [9997] 2005-07-04 04:00:00 2007-02-16 22:09:00 2007-02-24 15:49:00 [1] NA length(LastModified) [1] 9 length(c(LastModified)) [1] 9 I was expecting to get 1 as an answer. I'm trying to bind two vector, and I keep getting the error - number of rows of result is not a multiple of vector length. Thus I tested length and got this value. Any hint? Thanks in advance, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Error in length of vector ?
Thanks. Using as.POSIXct() worked fine, length = 1. Basically I cannot have a column of POSIXlt values in a matrix? Sérgio Nunes On 3/2/07, Petr Pikal [EMAIL PROTECTED] wrote: Hi you stepped on a difference between POSIXct and POSIXlt Details There are two basic classes of date/times. Class POSIXct represents the (signed) number of seconds since the beginning of 1970 as a ***numeric vector***. Class POSIXlt is a ***named list*** of vectors representing so you need to change your POSIXlt - named list to POSIXct by as.POSIXct(your vector) HTH Petr Maybe it could be useful to give some kind of warning into the help page of strptime e.g. Be aware of length of an objects created by strptime as POSIXlt class. It is always 9. See Details section of DateTimeClasses. On 2 Mar 2007 at 12:33, Sérgio Nunes wrote: Date sent: Fri, 2 Mar 2007 12:33:46 + From: Sérgio Nunes [EMAIL PROTECTED] To: r-help@stat.math.ethz.ch Subject:[R] Error in length of vector ? Hi, I'm having a weird result with the length() function: a [... omited ...] [9994] NA2003-12-03 16:37:00 2002-06-26 18:43:00 [9997] 2005-07-04 04:00:00 2007-02-16 22:09:00 2007-02-24 15:49:00 [1] NA length(LastModified) [1] 9 length(c(LastModified)) [1] 9 I was expecting to get 1 as an answer. I'm trying to bind two vector, and I keep getting the error - number of rows of result is not a multiple of vector length. Thus I tested length and got this value. Any hint? Thanks in advance, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Petr Pikal [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Google Custom Search Engine for R
Hi, Since R is a (very) generic name, I've been having some trouble searching the web for this topic. Due to this, I've just created a Google Custom Search Engine that includes several of the most relevant sites that have information on R. See it in action at: http://google.com/coop/cse?cx=018133866098353049407%3Aozv9awtetwy This is really a preliminary test. Feel free to add yourself to the project and contribute with suggestions. Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Google Custom Search Engine for R
Hi, I've just created this search engine for testing today. I think that if you volunteer as a contributor (see link on the left side) you can then see and add to the list of sites. I've also noticed that I can add sites by importing a XML file. Is there any list of sites that could be easily converted to XML? Sérgio Nunes On 2/23/07, Matthew Keller [EMAIL PROTECTED] wrote: Hi Sergio, There was a discussion on this board recently about the difficulty of searching for R related material on the web. I think the custom google search engine is a good idea. It would be helpful if we could have access to the full list of websites it is indexing so that we could make suggestions about other sites that are missing. As it is, it only tells us that there are 35 websites, and shows us the first several. Also, you might check out Sasha Goodman's Rseek: http://www.rseek.org/ Have you tried to compare the success of yours with Rseek? All the Best, Matt On 2/23/07, Sérgio Nunes [EMAIL PROTECTED] wrote: Hi, Since R is a (very) generic name, I've been having some trouble searching the web for this topic. Due to this, I've just created a Google Custom Search Engine that includes several of the most relevant sites that have information on R. See it in action at: http://google.com/coop/cse?cx=018133866098353049407%3Aozv9awtetwy This is really a preliminary test. Feel free to add yourself to the project and contribute with suggestions. Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Matthew C Keller Postdoctoral Fellow Virginia Institute for Psychiatric and Behavioral Genetics __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Google Custom Search Engine for R
I just seen the link you suggested - RSeek - and it uses exactly the same service from Google. The only difference is that it is not open to new contributions. Maybe Sasha could open it to volunteers. Also it seems to be much more complete than my initial attempt (as expected :). I think that RSeek deserves a link in R's homepage. Sérgio Nunes On 2/23/07, Sérgio Nunes [EMAIL PROTECTED] wrote: Hi, I've just created this search engine for testing today. I think that if you volunteer as a contributor (see link on the left side) you can then see and add to the list of sites. I've also noticed that I can add sites by importing a XML file. Is there any list of sites that could be easily converted to XML? Sérgio Nunes On 2/23/07, Matthew Keller [EMAIL PROTECTED] wrote: Hi Sergio, There was a discussion on this board recently about the difficulty of searching for R related material on the web. I think the custom google search engine is a good idea. It would be helpful if we could have access to the full list of websites it is indexing so that we could make suggestions about other sites that are missing. As it is, it only tells us that there are 35 websites, and shows us the first several. Also, you might check out Sasha Goodman's Rseek: http://www.rseek.org/ Have you tried to compare the success of yours with Rseek? All the Best, Matt On 2/23/07, Sérgio Nunes [EMAIL PROTECTED] wrote: Hi, Since R is a (very) generic name, I've been having some trouble searching the web for this topic. Due to this, I've just created a Google Custom Search Engine that includes several of the most relevant sites that have information on R. See it in action at: http://google.com/coop/cse?cx=018133866098353049407%3Aozv9awtetwy This is really a preliminary test. Feel free to add yourself to the project and contribute with suggestions. Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Matthew C Keller Postdoctoral Fellow Virginia Institute for Psychiatric and Behavioral Genetics __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Working with temporal data
Hi again, I'm still trying to read my data but I'm having some difficulties converting it to dates. My data file has lines and in each line a single date exists in the format 2007/02/16 (without the ,). I've tried the following: d - readLines(file.dat) d [1] 2006/08/09 2004/02/11 2004/06/09 ... [2] ... d2 - as.Date(d, format=%Y/%m/$d) d2 [1] NA NA NA ... ... I'm surely doing something wrong. Any advice would be welcomed. Thanks! Sérgio Nunes On 2/15/07, Sérgio Nunes [EMAIL PROTECTED] wrote: Hi, I have several files with data in this format: 20070102 20070102 20070106 20070201 ... The data is sorted and each line represents a date (MMDD). I would like to analyze this data using R. For instance, I would like to have a histogram by year, month or day. I've already made a simple Perl script that aggregates this data but I believe that R can be much more powerful and easy on this kind of work. Any suggestions on where to start? Thanks in advance, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Working with temporal data [Solved]
Just for the record, here are my steps for producing a date based histogram. Data is stored in a file where each line only has a date - 2007/02/16 d-readLines(filename.dat) d-as.Date(d, format=%Y/%m/%d) pdf(yearly.pdf) hist(d, years) dev.off() Instead of years you can also use days, weeks, months, secs, mins, hours. One final question, how could I easily filter my dataset if, for instance, I only wanted to see results from 2006 ? Thanks to all who helped, Sérgio Nunes On 2/15/07, Sérgio Nunes [EMAIL PROTECTED] wrote: Hi, I have several files with data in this format: 20070102 20070102 20070106 20070201 ... The data is sorted and each line represents a date (MMDD). I would like to analyze this data using R. For instance, I would like to have a histogram by year, month or day. I've already made a simple Perl script that aggregates this data but I believe that R can be much more powerful and easy on this kind of work. Any suggestions on where to start? Thanks in advance, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Working with temporal data
Hi, I have several files with data in this format: 20070102 20070102 20070106 20070201 ... The data is sorted and each line represents a date (MMDD). I would like to analyze this data using R. For instance, I would like to have a histogram by year, month or day. I've already made a simple Perl script that aggregates this data but I believe that R can be much more powerful and easy on this kind of work. Any suggestions on where to start? Thanks in advance, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Working with temporal data
Please note that I do not have values, only dates that represent occurrences (one link, one date, one occurrence). This means that the same date might appear several times in different rows. Nevertheless, I think I can manage this based on your samples. Thanks, Sérgio Nunes On 2/15/07, jim holtman [EMAIL PROTECTED] wrote: Here is a start on what you want to do. This generates some test data and then does a couple of summaries: # generate some data N - 1000 x - data.frame(date=as.character(2007 + sample(1:4, N, TRUE) * 100 + sample(1:31, N, TRUE)), + value=runif(N)) head(x) # display the data date value 1 20070124 0.07904540 2 20070117 0.17864565 3 20070109 0.86078870 4 20070205 0.93952259 5 20070112 0.87904425 6 20070323 0.01717623 # assuming you read it in as character, convert to Date for processing x$date - as.Date(strptime(x$date, %Y%m%d)) x - x[order(x$date), ] # order by date for plotting plot(x$date, x$value, type='l') # plot the data # show counts by month table(months(x$date)) April February JanuaryMarch 238 236 253 237 # average by month aggregate(x$value, list(months(x$date)), mean) Group.1 x 1April 0.4791387 2 February 0.5010831 3 January 0.5114135 4March 0.4695668 On 2/15/07, Sérgio Nunes [EMAIL PROTECTED] wrote: Hi, I have several files with data in this format: 20070102 20070102 20070106 20070201 ... The data is sorted and each line represents a date (MMDD). I would like to analyze this data using R. For instance, I would like to have a histogram by year, month or day. I've already made a simple Perl script that aggregates this data but I believe that R can be much more powerful and easy on this kind of work. Any suggestions on where to start? Thanks in advance, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Ploting graphics using X tints from a color
Hi, I'm trying to draw a 2D plot using multiple tints of red. The (simplified) setup is the following: || year | x | y || My idea is that each year is plotted with a different tint of red. Older year (lightest) - Later year (darkest). I've managed to plot this with different scales of grays simply by doing: palette(gray(length(years):0/length(years))) before the plot and for each year the color used is a different tint of gray. So, is there any way to do this for any color? Any tip or advice? With this, I hope to visualize patterns in my dataset more easily. Thanks in advance for any help. Best regards, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] Manipulating matrices
Hi,
I'm pretty new to R and I've been having some problems filtering data
in matrices.
I have the following initial dataset:
|| year | name | varA ||
I have multiple values for varA for the same year and the same name.
Having this as the input I would like to obtain the following:
|| year | name | {varA mean} ||
Where I only have one line for each year and name with the mean of
the values of varA in varA mean.
Is there a simple way to achieve this without using control structures
(for or while cycles)?
Thanks in advance for any help.
Best regards,
Sérgio Nunes
__
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[R] Simplifying matrices ?
Hi again, the previous answers were great. I was able to do what was planned. Now, I would like to do the following to a matrix: || year | event | team | total || where I can have multiple event per team, but each team only has a year and a total. Thus, this table has multiple lines for the same team where only the event changes. Considering this, how can I output this: || year | team | total || where each team occurs only once, and the event was discarded. Hope I made myself clear. Thanks in advance. This is a great mailing list. Regards, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] Change console language ?
Hi, I'm pretty new to R, I've just installed version 2.1.1 on Windows. I have a simple (it seems) doubt - how do I change the Console default Language ? It's set to Portuguese but I would like to view it in English. Thanks in advance, Sérgio Nunes __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
