I have a list of IDs like this:
AB1234
AB4567
AB8901
In my dataset, there are IDs like this:
AB
AB /// AB1234
AB4567 /// AB8901 /// AB
I used grep(list$ID, dataset$ID, value=T)
It returned only one match, which was the very first match AB ///
AB1234. It seems once the first mat
t; From: r-help-boun...@r-project.org
>> [mailto:r-help-boun...@r-project.org] On Behalf Of jim holtman
>> Sent: Wednesday, August 05, 2009 5:23 AM
>> To: Rnewbie
>> Cc: r-help@r-project.org
>> Subject: Re: [R] problem with pattern matching
>>
>>
> -Original Message-
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of jim holtman
> Sent: Wednesday, August 05, 2009 5:23 AM
> To: Rnewbie
> Cc: r-help@r-project.org
> Subject: Re: [R] problem with pattern matching
>
&
efficient way of doing it. The whole
trick is to use grep with a vector of patterns.
Xavier
- Mail Original -
De: "Don MacQueen"
À: "Rnewbie" , r-help@r-project.org
Envoyé: Mercredi 5 Août 2009 16h49:58 GMT +01:00 Amsterdam / Berlin / Berne /
Rome / Stockholm / Vienne
O
Perhaps
intersect()
or
merge()
will help. But, like others, I find it difficult to understand
exactly what you want. I'd suggest providing a short example with
actual ID values.
-Don
At 2:36 AM -0700 8/5/09, Rnewbie wrote:
I wanted to extract my interested rows from a dataframe. I used:
the problem in my case is that some of the cells in dataframe$ID contain
multiple IDs, but in list$ID there is only one ID in each cell, so some of
the IDs cannot be matched if using the fucntion 'match' or '%in%'
jholtman wrote:
>
> I think you want to use either 'match' or '%in%'
>
> x <- da
I think you want to use either 'match' or '%in%'
x <- dataframe$ID %in% list$ID # TRUE if it is in list
On Wed, Aug 5, 2009 at 5:36 AM, Rnewbie wrote:
>
> I wanted to extract my interested rows from a dataframe. I used:
>
> grep(list$ID, dataframe$ID, value=T) #list contains a list of my interes
I wanted to extract my interested rows from a dataframe. I used:
grep(list$ID, dataframe$ID, value=T) #list contains a list of my interested
IDs
I got one match in return, which is the very first ID in list. It seems the
matching process just stopped, once the first match was found.
David Win
On Aug 4, 2009, at 11:16 AM, Rnewbie wrote:
dear all,
I got a problem with pattern matching using grep. I extracted a list
of
characters from a data frame, and I tried to match this list of
characters
to a column from another data frame. In return, I got only one
match, but
there shoul
dear all,
I got a problem with pattern matching using grep. I extracted a list of
characters from a data frame, and I tried to match this list of characters
to a column from another data frame. In return, I got only one match, but
there should be far more matches. Any ideas what has gone wrong?
10 matches
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