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Hi,

Not sure if this is the issue or not, but it looks like the code you're
using overwrites `geno_time` with the output of `str_extract`. So if
`geno_time` starts out as your data.frame with a `time` column, the code
will run the first time, but the next time you try it, you'll get that
error.

Maybe you meant to add a date column?
```
geno_time$date
<- str_extract(geno_time$time,"[0-9]+\\/[0-9]+\\/[0-9]+[:blank:]?")
```

Best,
--
Hao Ye
[log in to unmask]

On Fri, Jul 27, 2018 at 3:31 PM, El Rouby,Nihal M <[log in to unmask]>
wrote:

> Dear All-
>
>
>
> Trying to extract dates from a variable in a data frame and then make a
> new column with these dates. I’m using regular expression along str_extract
> command from package stringr.
>
>
>
> I’m getting the error  “Error in geno_time$time : $ operator is invalid
> for atomic vectors” when I used this command below on my dataframe.
>
>
>
> geno_time<-str_extract(geno_time$time,"[0-9]+\\/[0-9]+\\/[
> 0-9]+[:blank:]?")
>
>
>
> I’m attaching example of my data and what I want to accomplish.
>
>
>
> I appreciate your input and have a great weekend.
>
>
>
> Best,
>
> Nihal
> This list strives to be beginner friendly. However, we still ask that you
> PLEASE do read the posting guide https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=QWxQId63qB2iSP1ggUL7kQsdfEWUTu6qCGEw8Xuo91A&m=rP-xC3_sj74fZAMis9CdHcpNMiD3vovWgxfgpkmuIFA&s=boTHyzN2rykIZWbHf5Da0VSglWSIoKMb60l6w1F8mak&e=
> posting-guide.html
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwMGaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=SEmRVMqAFbH_Cx3K2dozZfH2QG2rALCjx8XkDKdS6dE&m=T6R-RSm5riVLS3uc4XkFK3DKka0OBHS_xTyuBQFWZEI&s=09WZYsfZUOMxABjBMdwqhoWEJYAjHasn3xzv7Ym38Zg&e=>
> and provide commented, minimal, self-contained, reproducible code.

This list strives to be beginner friendly.  However, we still ask that you
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.