Hi everyone,

I'd like to replace the empty cells from a numerical variable (let's say 
variable "AAA") with zero in multiple dataframes using "plyr" package. 
Of course all the dataframes have the same structure but different 
number of lines.

I've been trying variations of:

|dataset <- list.files(pattern = "*.tab")

replace_empty <- llply(dataset,function(x){x$AAA[is.na(x$AAA)] <-0; return(x)})
|

But I always get the same error message:

    unexpected numeric constant in "llply(dataframes,function(x){x$AAA"

Any suggestion?

Thank you in advance!

Regards,

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