On Thu, Jan 14, 2010 at 2:08 PM, Gerhard Muenz <[email protected]> wrote:
> public double[] evaluateModel(Classifier classifier,
> Instances data,
> java.lang.Object... forPredictionsPrinting)
> throws java.lang.Exception
>
>
> Calling
>> java_invoke(o, "evaluateModel", c, d)
> I get this error:
> error: [java] java.lang.NoSuchMethodException: evaluateModel
>
> So, I need to provide the optional parameter "forPredictionsPrinting".
> If provided, forPredictionsPrinting needs to be a StringBuffer object, a
> weka.core.Range object, and a boolean:
That's the way variable arguments are represented internally in JVM,
as an additional array argument. There's no specific support to detect
whether the last argument is actually a varargs array.
> sf = java_new('java.lang.StringBuffer');
> range = java_new('weka.core.Range','first-last');
> jtrue = java_new('java.lang.Boolean', true);
I don't think that jtrue is actually an octave_java object.
> The only solution I've found was to remove lines 762 to 770 in
> __java__.cc:
>
> if (retval.is_undefined ())
> {
> cls = jni_env->FindClass ("java/lang/Boolean");
> if (jni_env->IsInstanceOf (jobj, cls))
> {
> jmethodID m = jni_env->GetMethodID (cls, "booleanValue",
> "()Z");
> retval = jni_env->CallBooleanMethod (jobj, m);
Could you try the following instead:
retval = (jni_env->CallBooleanMethod (jobj, m) ? true : false);
You'll also need to modify the unbox function with the following code
(put if before the test is_real_scalar()):
else if (val.is_bool_scalar ())
{
bool bval = val.bool_value ();
jclass_ref bcls (jni_env, jni_env->FindClass ("java/lang/Boolean"));
jfieldID fid = jni_env->GetStaticFieldID (bcls, "TYPE",
"Ljava/lang/Class;");
jmethodID mid = jni_env->GetMethodID (bcls, "<init>", "(Z)V");
jcls = reinterpret_cast<jclass> (jni_env->GetStaticObjectField
(bcls, fid));
jobj = jni_env->NewObject (bcls, mid, bval);
}
This is untested, you might need some adaptation.
Let me know if it works.
Michael.
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