Hi Eric, Thanks for your quick response. It works.
Have a nice weekend! Aiguo From: Eric Berger <ericjber...@gmail.com> Date: Friday, February 18, 2022 at 3:35 PM To: "Li, Aiguo (NIH/NCI) [E]" <l...@mail.nih.gov> Cc: "r-help@r-project.org" <r-help@r-project.org> Subject: [EXTERNAL] Re: [R] A question of data frame filter based on another one CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and are confident the content is safe. x[apply(y,MAR=1,sum) > 0,] On Fri, Feb 18, 2022 at 10:24 PM Li, Aiguo (NIH/NCI) [E] via R-help <r-help@r-project.org<mailto:r-help@r-project.org>> wrote: I have tow dataframes as below: > x id g 1 1 21 2 3 52 3 2 43 4 4 94 5 5 35 > y id g 1 1 1 2 0 0 3 0 1 4 1 0 5 1 0 Results dataframe I want is: 1 21 2 43 4 94 5 35 Basically I want to extract all the values in x which corresponding those values =1 in y. I tried: x[which(y==1),]. It gets: id g 1 1 21 4 4 94 5 5 35 NA NA NA NA.1 NA NA But missing the row: 2 43. Any help will be appreciated. Thanks, Aiguo [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To UNSUBSCRIBE and more, see 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. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
