[R] how to have 'match' ignore no-matches

[Jill Hollenbach]

Let me clarify:
I'm using this--

dfnew<- sapply(df, function(df) lookuptable[match(df, lookuptable [ ,1]),
2])

>lookup
0101   01:01
0201   02:01
0301   03:01
0401   04:01

>df
0101   0301
0201   0401
0101   0502

>dfnew
01:01   03:01
02:01   04:01
01:01   NA

but what I want is:
>dfnew2
01:01   03:01
02:01   04:01
01:01   0502

thanks again,
Jill




Jill Hollenbach wrote:
> 
> Hi all,
> I think this is a very basic question, but I'm new to this so please bear
> with me.
> 
> I'm using match to translate elements of a data frame using a lookup
> table. If the content of a particular cell is not found in the lookup
> table, the function returns NA. I'm wondering how I can just ignore those
> cells, and return the original contents if no match is found in the lookup
> table.
> 
> Many thanks in advance, this site has been extremely helpful for me so
> far,
> Jill
> 
> Jill Hollenbach, PhD, MPH
>     Assistant Staff Scientist
>     Center for Genetics
>     Children's Hospital Oakland Research Institute
>     jhollenbach at chori.org
> 

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