[R] Populate one data frame with values from another dataframe for rows that match
Kevin Wamae
KWamae at kemri-wellcome.org
Sun Oct 15 13:03:45 CEST 2017
Dear @William<mailto:wdunlap at tibco.com>, thanks for the feedback. I have tested it on the larger dataset and noticed that it created two variables, pf_raw and pf_curated.
The output we were looking for, was one that takes the variable pf_mcl in curated dataset and replaces pf_mcl in matching rows within the raw dataset.
@Eric<mailto:ericjberger at gmail.com>’s solution was able to achieve that. Nonetheless, we do appreciate your solution.
Regards
------------------
Kevin Wamae
From: William Dunlap <wdunlap at tibco.com>
Date: Saturday, 14 October 2017 at 20:21
To: Kevin Wamae <KWamae at kemri-wellcome.org>
Cc: Bert Gunter <bgunter.4567 at gmail.com>, Rui Barradas <ruipbarradas at sapo.pt>, R-help <R-help at r-project.org>
Subject: Re: [R] Populate one data frame with values from another dataframe for rows that match
Your example used one distinct studyno in DF1 and one distinct pf_mcl in DF2. I think that makes it hard to see what is going on, but maybe I completely misunderstand the problem. In any case, let's redefine myDF1 and myDF2. Note that myDF1 contains a studyno not in myDF2 and vice versa.
myDF1 <- structure(list(studyno = c("J1000/9", "J895/7", "J931/6", "J666/6",
"J1000/9", "J1000/9"), date = structure(c(17123, 17127, 17135,
17144, 17148, 17155), class = "Date"), pf_mcl = c(NA_integer_,
2L, 3L, 4L, 5L, NA_integer_
), year = c(2016, 2016, 2016, 2016, 2016, 2016)), .Names = c("studyno",
"date", "pf_mcl", "year"), row.names = c(NA, 6L), class = "data.frame")
myDF2 <- structure(list(studyno = c("J740/4", "J1000/9", "J895/7", "J931/6",
"J609/1", "J941/3"), pf_mcl = c(101L, 102L, 103L, 104L, 105L, 106L)),
.Names = c("studyno", "pf_mcl"), row.names = c(NA, 6L), class = "data.frame")
m <- merge(myDF1, myDF2, by="studyno", all.x=TRUE, all.y=FALSE, suffixes=c(".raw", ".curated"))
The results are:
> myDF1
studyno date pf_mcl year
1 J1000/9 2016-11-18 NA 2016
2 J895/7 2016-11-22 2 2016
3 J931/6 2016-11-30 3 2016
4 J666/6 2016-12-09 4 2016
5 J1000/9 2016-12-13 5 2016
6 J1000/9 2016-12-20 NA 2016
> myDF2
studyno pf_mcl
1 J740/4 101
2 J1000/9 102
3 J895/7 103
4 J931/6 104
5 J609/1 105
6 J941/3 106
> m
studyno date pf_mcl.raw year pf_mcl.curated
1 J1000/9 2016-11-18 NA 2016 102
2 J1000/9 2016-12-13 5 2016 102
3 J1000/9 2016-12-20 NA 2016 102
4 J666/6 2016-12-09 4 2016 NA
5 J895/7 2016-11-22 2 2016 103
6 J931/6 2016-11-30 3 2016 104
Now your problem is to combine the columns pf_mcl.raw and pf_mcl.curated in the way you want. ifelse() may be useful for that.
Bill Dunlap
TIBCO Software
wdunlap tibco.com<http://tibco.com>
On Fri, Oct 13, 2017 at 10:48 PM, Kevin Wamae <KWamae at kemri-wellcome.org<mailto:KWamae at kemri-wellcome.org>> wrote:
Dear @Bert Gunter<mailto:bgunter.4567 at gmail.com<mailto:bgunter.4567 at gmail.com>>, I tried merge and I faced many challenges. @Rui Barradas<mailto:ruipbarradas at sapo.pt<mailto:ruipbarradas at sapo.pt>> solution is working.
From: Bert Gunter <bgunter.4567 at gmail.com<mailto:bgunter.4567 at gmail.com>>
Date: Friday, 13 October 2017 at 22:44
To: Kevin Wamae <KWamae at kemri-wellcome.org<mailto:KWamae at kemri-wellcome.org>>
Cc: R-help <R-help at r-project.org<mailto:R-help at r-project.org>>
Subject: Re: [R] Populate one data frame with values from another dataframe for rows that match
?merge
Bert
On Oct 13, 2017 12:09 PM, "Kevin Wamae" <KWamae at kemri-wellcome.org<mailto:KWamae at kemri-wellcome.org><mailto:KWamae at kemri-wellcome.org<mailto:KWamae at kemri-wellcome.org>>> wrote:
I'm trying to populate the column “pf_mcl” in myDF1 with values from myDF2, where rows match based on column "studyno" but the solutions I have found so far don't seem to be giving me the desired output.
Below is a snapshot of the data.frames.
myDF1 <- structure(list(studyno = c("J1000/9", "J1000/9", "J1000/9", "J1000/9",
"J1000/9", "J1000/9"), date = structure(c(17123, 17127, 17135,
17144, 17148, 17155), class = "Date"), pf_mcl = c(NA_integer_,
NA_integer_, NA_integer_, NA_integer_, NA_integer_, NA_integer_
), year = c(2016, 2016, 2016, 2016, 2016, 2016)), .Names = c("studyno",
"date", "pf_mcl", "year"), row.names = c(NA, 6L), class = "data.frame")
myDF2 <- structure(list(studyno = c("J740/4", "J1000/9", "J895/7", "J931/6",
"J609/1", "J941/3"), pf_mcl = c(0L, 0L, 0L, 0L, 0L, 0L)), .Names = c("studyno",
"pf_mcl"), row.names = c(NA, 6L), class = "data.frame")
myDF2 is a well curated subset of myDF1. Some rows in the two datasets match based on "studyno", one may find that values are missing in myDF1$pf_mcl or the values are wrong.
All I want to do is identify a matching row in myDF2 and populate myDF1$pf_mcl with the value in myDF2$pf_mcl. If a row does not match based on “studyno”, the value should remain the same.
It's probably worth mentioning, the two data frames have other columns...I have selected a few for example purposes.
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