| Input Matrix | Contains the matrix whose size will be the size of the null matrix . | False | Only visible when the Null size source property is Matrix. | Input | Matrix port |
| Row count | The number of rows in the null matrix. | True | Only visible when the Null size source property is Scalar and the corresponding property is exposed. | Input | Analog port |
| Column count | The number of columns in the null matrix. | True | Only visible when the Null size source property is Scalar and the corresponding property is exposed. | Input | Analog port |
| Result | The resulting matrix filled with zeroes. | False | | Output | Matrix port |