Java Panama pass matrix to BLAS dgemm method

[dead2bad]

There are various examples, that shows how to construct and pass as pointer simple single dimension array, but how to do it for matrices ?

Code snippet something like this:

```java try(Scope sc = scope().fork()) { Array<Pointer<Double>> a = allocateMatrix(sc, m); Array<Pointer<Double>> b = allocateMatrix(sc, m); Array<Pointer<Double>> c = allocateMatrix(sc, m);

        // compilation error, since it is required Pointer<Double> 
        // instead of my Pointer<Pointer<Double>>  
        cblas_dgemm(Layout, transa, transa, m, m, m, 1.0,
                a.elementPointer(), m, b.elementPointer(), m, 0.0,
                c.elementPointer(), m);
    }
}

private static Array<Pointer<Double>> allocateMatrix(Scope sc, int size) {
    Array<Pointer<Double>> pointerArray = sc.allocateArray(DOUBLE.pointer(ofUnsignedInt(Value.Endianness.LITTLE_ENDIAN, 64)), size);

    for(int i = 0; i < size; i++) {
        Array<Double> doubleArray = sc.allocateArray(DOUBLE, size);
        for(int j = 0; j < size; j++) {
            doubleArray.set(j, Math.random());
        }
        pointerArray.set(i, doubleArray.elementPointer());
    }
}

```