尝试使用R编写xlsx文件时出现错误消息

Question

I try to save some R-dataframes into .xlsx-files using the write.xlsx function of the xlsx package like this

write.xlsx(tab,file="test",sheetName="testsheet",col.names=TRUE,row.names=FALSE,append=FALSE)

whereas the object tab is a data frame, as prooved here

> class(tab)
[1] "data.frame"

When I run the code I get the following error message

>  write.xlsx(tab,file="test.xlsx",sheetName="testsheet",col.names=TRUE,row.names=FALSE,append=FALSE)
Fehler in .jcall("RJavaTools", "Z", "hasField", .jcast(x, "java/lang/Object"),  : 
  RcallMethod: cannot determine object class

and I have no particular idea what the problem could be.

PS: I'm running R 2.14.1 in the StatET 2.0 plugin in Eclipse 3.7 on a 64bit machine.

Answer 1

From my experience these kind of errors are produced when the standard rj package is installed instead of the one supplied bij the StatET developer. Check the installation guide here: http://www.walware.de/goto/statet

If you would happen to be using Debian or Ubuntu, you can also use the repository from OpenAnalytics to install StatET and the correct rj packages in one go.

http://deb.openanalytics.eu/howto.html

Answer 2

When you work in Eclipse, you can start R using either rj - a Java terminal, or RTerm - the native R terminal.

If you are using the rj terminal and something doesn't work, try the same thing with RTerm .

I have never tried to figure out why, but a few things don't work properly in rj . This includes all use of RCOM as well as printing of the return value of system() .

I use rj by default because I like the way it deals with help (amongst other benefits).
But if things don't work, I try it in RTerm . One day I'll have some spare time and I'll take it up with the author.

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PS. I want to stress that I absolutely love StatET in Eclipse. These oddities or rj are very minor inconveniences in the grand scheme of things.