Dear All, I'm creating a project which uses both java and R.
I created the java class named MyClass and within that wrote two
separate methods (graphing1() and fitness()) to call the r scripts.
public void graphing1() throws IOException {
String newargs1[] = {"--no-save"};
Rengine r1 = new Rengine(newargs1, false, null);
r1.eval("source('test2.R')");
r1.end();
}
public void fitness() throws IOException {
String newargs1[] = {"--no-save"};
Rengine r3 = new Rengine(newargs1, false, null);
r3.eval("source('A.R')");
r3.eval("source('B.R')");
r3.end();
}
Both of the above methods are in java class MyClass.
>From another class in the same project for which I created a gui, I
accessed the fitness() function and it worked fine. But when I try to
call the graphing1() function it did not work. (both were called
through the gui) The programme hangs at ;
Rengine r1 = new Rengine(newargs1, false, null);
without any notification. In both instances I called the function as follows:
1st instance:
MyClass test=new MyClass();
test.fitness() ;
2nd instance:
MyClass test1 = new MyClass();
test1.graphing1();
All the 3 scripts are coded to create png files. test2.R and A.R
scripts use the ROCR library and B.R do not use any. All the 3 files
end with dev.off() statement.
I have installed R 3.1.3. I’m using netbeans as the editor and working
in windows environment.
The 3 scripts work fine when executed in R environment. The issue
arises when it’s called from the java code.
I'm a student who is new to R and was struggling to solve this issue
for several weeks. Your help is greatly appreciated.
Thanks in advance.
REngine hangs when called within java code -- problem.pdf
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