Hi there, I am new to R and programming in general and am looking for help with writing a function with dates and times. I have checked around but am still a bit stuck.
Basically, I have data in the format "dd/mm/YYYY HH:MM" and I have to calculate how much time has passed between various events. I have given the following command ( where "date" is the column in my data frame that indicates the date and time) date=as.Date.factor(date,format="%d/%m/%Y %H:%M") However, this displays only the date, without the time. I also have tried: date=substr(argo1$date,1,907) And it shows the date and time. However, when I try to find the difference between two dates i.e.the time that has passed with the command: difftime(date[2],date[3],unit="secs"), it returns that 0 seconds have passed. When I try to find the difference with the command: date[3]-date[2] it tells me Error in date[3] - date[2] : non-numeric argument to binary operator The class(date) is "character". Any idea what I am doing wrong? Thank you very much in advance! On 19 December 2013 15:22, <r-help-requ...@r-project.org> wrote: > Welcome to the R-help@r-project.org mailing list! > > To post to this list, send your message to: > > r-help@r-project.org > > General information about the mailing list is at: > > https://stat.ethz.ch/mailman/listinfo/r-help > > If you ever want to unsubscribe or change your options (eg, switch to > or from digest mode, change your password, etc.), visit your > subscription page at: > > https://stat.ethz.ch/mailman/options/r-help/lydiakeppler%40gmail.com > > You can also make such adjustments via email by sending a message to: > > r-help-requ...@r-project.org > > with the word `help' in the subject or body (don't include the > quotes), and you will get back a message with instructions. > > You must know your password to change your options (including changing > the password, itself) or to unsubscribe without confirmation. It is: > > whaletail27 > > Normally, Mailman will remind you of your r-project.org mailing list > passwords once every month, although you can disable this if you > prefer. This reminder will also include instructions on how to > unsubscribe or change your account options. There is also a button on > your options page that will email your current password to you. > -- *Protect the environment: think before you print* ><((((ยบ> [[alternative HTML version deleted]]
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