Hi, Gabor,
Thanks for the reply. Perhaps Prof. Ripley will enlighten us as he is
the RODBC maintainer.
Unfortunately, gdata::read.xls will not work for me (at least I don't
think it will) because I need to refer to each worksheet by name and not
by number. For example, I need extract data from "Sheet1" and not simply
the first sheet.
Thanks,
--sundar
Gabor Grothendieck wrote:
> 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 <[EMAIL PROTECTED]> 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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>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>>
>
>
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