I also got a strange result too (I renamed it sdr.read.xls
to distinguish it from read.xls in gdata and noticed that a
space got into my na's somehow so I used "na " for my
na.strings:
> sdr.read.xls("/test.xls", "Sheet2", na.strings =
"na ")
x
1 <NA>
2 <NA>
3 na
4 na
5 na
6 na
7 <NA>
I had more success using read.xls in the gdata package.
Note that we need to install perl first if not already present:
> library(gdata) # for read.xls
> read.xls("/test.xls", 2, na.strings = "na ")
x
1 0.11
2 0.11
3 NA
4 NA
5 NA
6 NA
7 0.11
> R.version.string # XP
[1] "Version 2.3.1 Patched (2006-06-04
r38279)"> packageDescription("gdata")$Version
[1] "2.1.2"> packageDescription("RODBC")$Version
[1] "1.1-7"
On 7/12/06, Sundar Dorai-Raj <sundar.dorai-raj at pdf.com>
wrote:> Hi, all,
>
> I'm trying to use RODBC to read data from Excel. However, I'm
having
> trouble converting missing values to NA and rather perplexed by the
> output. Below illustrates my problem:
>
> ## DATA - copy to Excel and save as "tmp.xls"
> ## tmp.xls!Sheet1
> x
> 0.11
> 0.11
> na
> na
> na
> 0.11
>
> ## tmp.xls!Sheet2
> x
> 0.11
> 0.11
> na
> na
> na
> na
> 0.11
>
> ## R Code
> read.xls <- function(file, sheet = "Sheet1", ...) {
> require(RODBC)
> channel <- odbcConnectExcel(file)
> sheet <- sprintf("select * from `%s$`", sheet)
> x <- sqlQuery(channel, sheet, ...)
> odbcClose(channel)
> x
> }
>
> read.xls("./tmp.xls", "Sheet1", na.strings =
"na")
> ## works as expected
> # x
> #1 0.11
> #2 0.11
> #3 NA
> #4 NA
> #5 NA
> #6 0.11
>
> read.xls("./tmp.xls", "Sheet2", na.strings =
"na")
> ## Huh? What happened?
> # x
> #1 NA
> #2 NA
> #3 NA
> #4 NA
> #5 NA
> #6 NA
> #7 NA
>
> > sessionInfo()
> Version 2.3.1 (2006-06-01)
> i386-pc-mingw32
>
> attached base packages:
> [1] "methods" "stats" "graphics"
"grDevices" "utils" "datasets"
> [7] "base"
>
> other attached packages:
> RODBC
> "1.1-7"
>
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