[R] How to convert blanks to NA

[John Kane]

Does this do what you want

x <- data.frame(1,"" , 5)
x[x==""]  <- NA
x

where x is substituted for your 'data'?




----- Original Message ----
From: Mark Na <mtb954 at gmail.com>
To: r-help at r-project.org
Sent: Tuesday, June 2, 2009 3:14:00 PM
Subject: [R] How to convert blanks to NA

Hi R-helpers,

I have imported data from Excel using the following code:

library(xlsReadWrite)
data <- read.xls(data,colClasses=c("character"))

and this results in all of the empty (blank) cells in the imported
Excel file also being empty (blank) in the resulting dataframe.

I am not used to having blanks (rather NAs) and I think these are
caused by the colClasses argument.

I would like to convert all the empty (blank) cells in my dataframe to NA.

Thanks for any help you might provide.

Mark

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