[R] Why the result is coming as NULL?

[Jessica Streicher]

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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