I assume "result" means the invalid variable.
works with sample data frame i made, so please provide an example of cdb_frame.
You can use dput(cdb_frame) for that, or dput(head(cdb_frame)) if you have a
lot of data.
For example it could be that $Publication is a string, not numeric.
On 01.08.2012, at 08:58, Sri krishna Devarayalu Balanagu wrote:
> Why the result is coming as NULL. Can anyone help. I want to find the
> outliers for a reference
>
>
> setwd("D:/AZ")
>
> library("RODBC")
> cdb_cnct <- odbcConnectExcel("Book1.xls")
> cdb_frame <- sqlFetch(cdb_cnct, "Sheet1")
> odbcClose(cdb_cnct)
> rm(cdb_cnct)
>
> x<- cdb_frame$Publication >=1990 & cdb_frame$Publication <=2012
> invalid <- cdb_frame[!x, c("Reference")]
> invalid
>
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