jni_ vec_ mat_ mul
fun jni_vec_mat_mul(env: CPointer<JNIEnvVar>, thisObject: jobject, a: jdoubleArray, aOffset: jint, aSize: jint, b: jdoubleArray, bOffset: jint, m: jint, n: jint, p: jint): jdoubleArray?
fun jni_vec_mat_mul(env: CPointer<JNIEnvVar>, thisObject: jobject, a: jdoubleArray, aOffset: jint, aSize: jint, b: jdoubleArray, bOffset: jint, m: jint, n: jint, p: jint): jdoubleArray?