[R] sqldf merging with subset in specific range
jim holtman
jholtman at gmail.com
Thu Dec 27 01:08:32 CET 2012
Is this what you want:
> m <- read.table(text = "10
+ 15
+ 36
+ 37
+ 38
+ 44
+ 45
+ 57
+ 61
+ 62
+ 69 ")
> n <- read.table(text = "30 38
+ 52 62 ")
>
> require(sqldf)
> sqldf("select m.V1
+ from m, n
+ where m.V1 between n.V1 and n.V2
+ ")
V1
1 36
2 37
3 38
4 57
5 61
6 62
>
On Wed, Dec 26, 2012 at 7:00 PM, Matthew Liebers <mrl86 at cornell.edu> wrote:
> Hi all:
>
> I have two data sets. Set A includes a long list of hits in a single
> column, say:
> m$V1
> 10
> 15
> 36
> 37
> 38
> 44
> 45
> 57
> 61
> 62
> 69 ...and so on
>
> Set B includes just a few key ranges set up by way of a minimum in column X
> and a maximum in column Y. Say,
> n$X n$Y
> 30 38 # range from 30 to 38
> 52 62 # range from 52 to 62
>
> I would like the output to be the rows containing the following columns:
> m$V1
> 36
> 37
> 38
> 57
> 61
> 62
>
> I am interested in isolating the hits in data set A that correspond to any
> of the "hotspot" ranges in data set B. I have downloaded sqldf and tried a
> couple things but I cannot do a traditional merge since set B is based on a
> range. I can always do a manual subset but I am trying to figure out if
> there is anything more expedient since these df's will be quite large.
>
> Thanks!
>
> Matt
>
> [[alternative HTML version deleted]]
>
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--
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.
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