@Override
    public IComplexNDArray sub(INDArray other, INDArray result) {
        return dup().subi(other, result);
    }
@Override
    public IComplexNDArray sub(INDArray other, INDArray result) {
        return dup().subi(other, result);
    }
@ Override public IComplexNDArray sub ( INDArray other , INDArray result ) { return dup ( ) . subi ( other , result ) ; }
copy subtraction of two matrices

@param other  the second ndarray to subtract
@param result the result ndarray
@return the result of the subtraction
copy subtraction of two matrices