Merge has an option 'all', when set to 'TRUE' merge will return a data.frame of every row in both data.frames. You can also specify all.x, and all.y.
I do not suggest taking this path. Rather, standardize time columns for all 15 data.frames with as.POSIXct()/as.POSIXlt() depending on the input time format. -Kevin On 10/18/13 04:37 , "sandeep.samp...@ril.com" <sandeep.samp...@ril.com> wrote: Hi, I'm trying to combine 15 different data frames but all have time field as common. But the thing is time intervals are different (like min's and sec's). So I have to check the common time from all the 15 data frames and merge it to a single data frame and then export it to excel or csv. I tried with below query but it's not giving exact output. It's almost 5 year of data, but its giving output for 3months only. Please help with your query to get my output. a <- merge(MA2DHPA,MA2DHPB,by="IP_Trend_Time") b <- merge(MA2UCPA,MA2UCPB,by="IP_Trend_Time") c <- merge(MA2DCPA,MA2DCPB,by="IP_Trend_Time") d <- merge(MA2DHTA,MA2DHTB,by="IP_Trend_Time") e <- merge(MA2UCTA,MA2UCTB,by="IP_Trend_Time") f <- merge(MA2DCTA,MA2DCTB,by="IP_Trend_Time") g <- merge(MA2CP,MA2CPS,by="IP_Trend_Time") h <- MA2AP x <- merge(a,b,by="IP_Trend_Time") y <- merge(c,d,by="IP_Trend_Time") z <- merge(e,f,by="IP_Trend_Time") w <- merge(g,h,by="IP_Trend_Time") x1 <- merge(x,y,by="IP_Trend_Time") y1 <- merge(z,w,by="IP_Trend_Time") MA2 <- merge(x1,y1,by="IP_Trend_Time") Regards, Sandeep S|IT&C, Reliance Industries Limited (E&P) | Onshore Terminal | Gadimoga * +91 884 2977066 / 9908130749 Please consider the environment before printing this email. --------------------------------------------------------------------------------- The information transmitted in this email is intended on...{{dropped:9}} ______________________________________________ R-help@r-project.org mailing list 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.