HI All,
I found that other R users experienced the same problem when using sqldf
package. An expert provided solution, adding "method="raw" at the end as below,
one or more of the columns in my data.frame are of class "AsIs" ( I don't know
what it is) . When sqldf retrieves the result from SQLite it will be numeric
or character and since it was originally of class AsIs, it tries to convert it
back but R provides no as.AsIs, so it fails; use method = "raw", so sqldf will
not try to convert the results from the database.
DMRlog2pbde47DMS <- sqldf("select * from DMR_log2pbde47 as a left join
DMS_log2pbde47 as b
on a.chrom = b.chromo and a.start <= b.MAPINFO and
a.end >= b.MAPINFO", method = "raw" )
-----Original Message-----
From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Ding, Yuan Chun
Sent: Wednesday, April 18, 2018 10:38 AM
To: r-help@r-project.org
Subject: [R] merge two data frame based on equal and unequal comparisons
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Dear R users,
I need to merge two data frames based on both equal and unequal comparisons.
The "sqldf" package used to work well , but today, I cannot resolve the
following error by reinstallation of the sqldf package. Can anyone suggest a
different way to perform this kind of merge function?
Thank you,
Ding
> DMRlog2pbde47DMS <- sqldf("select * from DMR_log2pbde47 as a left join
> DMS_log2pbde47 as b
+ on a.chrom = b.chromosome and a.start <=
+ b.MAPINFO and a.end >= b.MAPINFO" )
Error in get(as.character(FUN), mode = "function", envir = envir) :
object 'as.AsIs' of mode 'function' was not found
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