Right! I updated zoo and the example worked. I should have started by updating the library in the first place...I slept well and I had my cup of coffee this morning so I don't really have any excuse :-)
Thanks Gabor! Francisco >From: "Gabor Grothendieck" <[EMAIL PROTECTED]> >To: "Francisco J. Zagmutt" <[EMAIL PROTECTED]> >CC: [EMAIL PROTECTED], [email protected] >Subject: Re: [R] difference between 2 dates: IN MONTHS the way >Motherscompute it >Date: Sun, 12 Mar 2006 21:13:50 -0500 > >Maybe you have an old version of zoo? When I run the first one >I get 1. I am using R 2.2.1 under Windows XP and checking >the Built: line of library(help = zoo) I am using the verson of >zoo version built on Feb 6, 2006: > > > 12*as.numeric(as.yearmon("2006-03-07")-as.yearmon("2006-02-07")) >[1] 1 > >In the second example you are not giving it a date but are subtracting >a bunch of numbers and giving that to as.yearmon. > > >On 3/12/06, Francisco J. Zagmutt <[EMAIL PROTECTED]> wrote: > > Thanks Gabor, that's what I understood but then why do I get these >results? > > > > library(zoo) > > > > 12*as.numeric(as.yearmon("2006-03-07")-as.yearmon("2006-02-07")) > > [1] NA > > Warning messages: > > 1: NAs introduced by coercion > > 2: NAs introduced by coercion > > > > 12*as.numeric(as.yearmon(2006-03-07)-as.yearmon(2006-02-07)) > > [1] -12 > > > > >12*as.numeric(as.yearmon(as.Date("2006-03-07"))-as.yearmon(as.Date("2006-02-07"))) > > [1] 1 > > > > version > > _ > > platform i386-pc-mingw32 > > arch i386 > > os mingw32 > > system i386, mingw32 > > status > > major 2 > > minor 2.1 > > year 2005 > > month 12 > > day 20 > > svn rev 36812 > > language R > > > > I am sure I am missing somehting, but what is it?? > > > > Thanks > > > > Francisco > > > > > > >From: "Gabor Grothendieck" <[EMAIL PROTECTED]> > > >To: "Francisco J. Zagmutt" <[EMAIL PROTECTED]> > > >CC: [EMAIL PROTECTED], [email protected] > > >Subject: Re: [R] difference between 2 dates: IN MONTHS the way > > >Motherscompute it > > >Date: Fri, 10 Mar 2006 21:01:55 -0500 > > > > > >as.yearmon has a character method so its not necessary to > > >convert it to Date first: > > > > > > > print(as.yearmon.character) > > >function (x, ...) > > >as.yearmon(as.Date(x, ...)) > > > > > >On 3/10/06, Francisco J. Zagmutt <[EMAIL PROTECTED]> wrote: > > > > Gabor, please correct me if I am wrong but shouldn't you use as.Date >to > > > > change the date string to a "Date" class before you call as.yearmon? > > >i.e. > > > > > > > > 12* > > > > > > > >as.numeric(as.yearmon(as.Date("2006-03-07"))-as.yearmon(as.Date("2006-02-07"))) > > > > > > > > That returns 1 in Windows XP > > > > > > > > Regards > > > > > > > > Francisco > > > > > > > > > > > > > > > > >From: "Gabor Grothendieck" <[EMAIL PROTECTED]> > > > > >To: "Smith, Phil" <[EMAIL PROTECTED]> > > > > >CC: [email protected] > > > > >Subject: Re: [R] difference between 2 dates: IN MONTHS the way > > > > >Motherscompute it > > > > >Date: Fri, 10 Mar 2006 13:38:12 -0500 > > > > > > > > > >zoo has the "yearmon" class which will convert a date to a year + > > > > >0/12 to 11/12 to represent the month, disregarding the day, so: > > > > > > > > > >library(zoo) > > > > >12 * as.numeric((as.yearmon("2006-03-07") - >as.yearmon("2006-02-06"))) > > ># 1 > > > > > > > > > >On 3/10/06, Smith, Phil <[EMAIL PROTECTED]> wrote: > > > > > > Hi R-people: > > > > > > > > > > > > I need a function to compute the number of months between 2 >dates, > > >in > > > > >the same way a mother would do it. > > > > > > > > > > > > For example, if a kid is born on February 6, the number of >months > > > > >between that date and March 7 is exactly 1 month, although it is >only > > >29 > > > > >days. > > > > > > > > > > > > Thank you! > > > > > > Phil Smith > > > > > > CDC > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > [[alternative HTML version deleted]] > > > > > > > > > > > > ______________________________________________ > > > > > > [email protected] mailing list > > > > > > https://stat.ethz.ch/mailman/listinfo/r-help > > > > > > PLEASE do read the posting guide! > > > > >http://www.R-project.org/posting-guide.html > > > > > > > > > > > > > > > >______________________________________________ > > > > >[email protected] mailing list > > > > >https://stat.ethz.ch/mailman/listinfo/r-help > > > > >PLEASE do read the posting guide! > > > > >http://www.R-project.org/posting-guide.html > > > > > > > > > > > > > > > > > > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
