nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/linalg/api/complex/BaseComplexNDArray.java
@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