[R] to match samples by minute

[Weiwu Zhang]

2013/8/16 PIKAL Petr <petr.pikal at precheza.cz>:
> You will get only general answer without some example data. Se Posting Guide.

Thanks. Yes I do expect general answer, because I feel this problem of
"unmatched samples" is ubiquitious, only that I don't have a good
Google keyword to dig myself.

> df.m <- merge(df1, df2, by="unixtime", all=TRUE)

Thanks, this is a good general answer indeed. See, I only need a
keyword (merge) to push me to the right track. In my particular case,
I need to cast my unixtime into number-of-minutes before merging it.