Re: [R] difference of two rows

e(x$YEAR, x$ID, FUN=function(a) c(diff(a), NA)) >> >> x > ID YEAR diff > 1 13 2007 NA > 2 15 20033 > 3 15 20062 > 4 15 2008 NA > 5 21 20061 > 6 21 2007 NA > > > On Wed, Nov 25, 2009 at 10:55 AM, clion wrote: >> >> Dear R user

[R] difference of two rows

Dear R user, I'd like to calculate the difference of two rows, where "ID" is the same. eg.: I've got the following dataframe: ID YEAR 13 2007 15 2003 15 2006 15 2008 21 2006 21 2007 and I'd like to get the difference, like this: ID YEAR diff 13 2007 NA 15 2003 3 15 2006 2 15

Re: [R] re ferring to data of previous rows

(NA, head(x, -1))) > > > On Wed, Oct 21, 2009 at 2:55 AM, clion wrote: >> >> Dear Rlers, >> in the following dataset I would like to insert a new column that refers >> to >> the data of the previous row. >> My question is whether the probability of a fema

[R] re ferring to data of previous rows

1 NA 1 2004 0 1 1 2005 1 0 1 2006 1 1 1 2007 0 1 2 2003 0 NA 2 2004 1 0 2 2005 1 1 2 2006 0 1 2 2007 1 0 3 2003 1 NA 3 2004 1 1 3 2005 1 1 3 2006 0 1 3 2007 0 0 any idea how I could program that? thanks a lot,

[R] "autonumber" for grouping variable

Dear R users, my dataframe looks like this head(dat) Id sex byear age 1 300 m 2003 50 2 300 m 2003 36 3 402f 2003 29 4 402f 2003 21 5 402f 2003 64 6 150 m 2005 43 ... ...(where Id is just the Identification number of Individual, sex (male or female), byear (=birth

Re: [R] mean over previous cells

well, it "kind of works" now, I get means from the 61st SST-value on (which is reasonable, so no "carful discarding" of the first 60 values) but aswell I only get means until the 186st SST-value (although I 've got about 4900 in total). Allt the rest is "NA" - besides the 60th value is "NaN" Any

[R] mean over previous cells

Dear RUsers, I guess this is an easy question for someone a little familiar with programming...(which I am not)... I've got 2 colummns, one shows just dates(SST_date, Class 'Date' num), the other one shows the SeaSurfaceTemperature (SST, num) at that certain date. SST_dateSST 2008-01-01 22.

Re: [R] length of object in repeated measures

gt; dat > > > I hope it helps. > > Best, > Dimitris > > > clion wrote: >> Hi there. >> I collectad data of several animals (Id) that were caught and measured at >> several occasions. >> The dataframe looks like this: >> Grouped Data: mass ~ age |

[R] length of object in repeated measures

Hi there. I collectad data of several animals (Id) that were caught and measured at several occasions. The dataframe looks like this: Grouped Data: mass ~ age | Id Id age mass 11 5.4 13 6.2 1 15 10.0 23 8.1 2 10