Trying to use RWeka package

[Quack]

First I installed rJava successfully.

> install.packages("rJava")

the console read:

Installing package into ‘C:/Users/mlrob/Documents/R/win-library/3.4’

(as ‘lib’ is unspecified)

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.4/rJava_0.9-10.zip'

Content type 'application/zip' length 726859 bytes (709 KB)

downloaded 709 KB

package ‘rJava’ successfully unpacked and MD5 sums checked

Then I installed RWeka successfully (I thought)

>Install.packages("RWeka")

The console read:

The downloaded binary packages are in

C:\Users\mlrob\AppData\Local\Temp\RtmpkxMbwA\downloaded_packages

But I was unable to use RWeka. I typed in

>library(RWeka)

console returned this discouraging message:

Error: package or namespace load failed for ‘RWeka’:

.onLoad failed in loadNamespace() for 'rJava', details:

call: fun(libname, pkgname)

error: JAVA_HOME cannot be determined from the Registry

In addition: Warning message:

package ‘RWeka’ was built under R version 3.4.4

Thank you for any advice on how to fix this.

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[andresrcs]

You can set the JAVA_HOME variable from your Rprofile.site or Renviron.site files, try adding something like this

#Change this path accordingly to your Java version and always match the architectures of R and Java (i.e. 64 or 32 bits)
Sys.setenv('JAVA_HOME'="C:/Program Files/Java/jdk-11.0.1/") 

[Quack]

Sys.setenv('JAVA_HOME'="C:/Program Files/Java/jdk-11.0.1/")
library(RWeka)
Error: package or namespace load failed for ‘RWeka’:
.onLoad failed in loadNamespace() for 'rJava', details:
call: inDL(x, as.logical(local), as.logical(now), ...)
error: unable to load shared object 'C:/Users/mlrob/Documents/R/win-library/3.4/rJava/libs/x64/rJava.dll':
LoadLibrary failure: The specified module could not be found.
In addition: Warning message:
package ‘RWeka’ was built under R version 3.4.4
install.packages("rJava")
Installing package into ‘C:/Users/mlrob/Documents/R/win-library/3.4’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.4/rJava_0.9-10.zip'
Content type 'application/zip' length 726859 bytes (709 KB)
downloaded 709 KB

package ‘rJava’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
C:\Users\mlrob\AppData\Local\Temp\Rtmp4glzPo\downloaded_packages

Sys.setenv('JAVA_HOME'="C:/Program Files/Java/jdk-11.0.1/")
library(RWeka)
Error: package or namespace load failed for ‘RWeka’:
.onLoad failed in loadNamespace() for 'rJava', details:
call: inDL(x, as.logical(local), as.logical(now), ...)
error: unable to load shared object 'C:/Users/mlrob/Documents/R/win-library/3.4/rJava/libs/x64/rJava.dll':
LoadLibrary failure: The specified module could not be found.
In addition: Warning message:
package ‘RWeka’ was built under R version 3.4.4

Thank you so much for your reply. My R package is 3.4.2. I will update it and try again.

[andresrcs]

@andresrcs

C:/Program Files/Java/jdk-11.0.1

This is just an example, you need to use your own path instead, are you also using Java 11?

[Max]

If you are looking to use that package to get a C4.5 model (via the J48 function), you'd be better off using the C50 package (which does not use Java).