Thanks!
On Fri, Oct 28, 2011 at 10:59 AM, Marc Schwartz <marc_schwa...@me.com>wrote:
> On Oct 28, 2011, at 9:49 AM, Ben Ganzfried wrote:
>
> > Hey,
> >
> > I'm trying to match patient identifiers from two separate input files,
> and
> > then add information from one of the input files to the corresponding
> output
> > file. I'd greatly appreciate any help!
> >
> > More specifically,
> > Input_File_1 has a column header "bcr_patient_barcode"
> > Input_File_2 has a column header "Barcode" and a column header "Batch"
> >
> > I want my script to match the appropriate patient identifiers since
> > "bcr_patient_barcode" and "Barcode" are not in the same order. Then I
> want
> > to add the information from "Batch" to the corresponding patient.
> >
> > My (incorrect) code is below:
> >
> > #batch
> > tmp <- Input_File_2$Barcode
> > tmp1 <- Input_File_1$bcr_patient_barcode
> >
> > for i in tmp
> > for item in tmp1
> > if (tmp == tmp1) {
> > curated$batch <- Input_File_2$Batch
> > }
> >
> > Thanks!
>
>
> See ?merge and then use something like:
>
> newDF <- merge(Input_File_2, Input_File_1, by.x = "Barcode", by.y =
> "bcr_patient_barcode")
>
> Also, pay attention to the 'all', 'all.x' and 'all.y' arguments, which
> control whether or not only matching records are retained or non-matching
> records are retained from one or both datasets. merge() performs an
> "SQL-like" join operation.
>
> HTH,
>
> Marc Schwartz
>
>
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