The two source inputs are referenced using MATRIX_SPECs having the following characteristics:
- PAYLOAD CONTENT must have one of these values:
- REAL
- COMPLEX
- MULTIVAR_REAL
- MULTIVAR_COMPLEX
- For the content types of REAL and COMPLEX, the MATRIX_SPEC associated with the two input sources must have the same CONTENT value.
- For MULTIVAR varieties, the following combinations are supported:
- For all MULTIVAR types: Both multivariate matrixes are of the same content type and both matrixes have the same number of payload fields.
- For MULTIVAR_REAL: One input is a MULTIVAR content matrix having greater than one payload field and the other matrix is a REAL content series having just one payload field.
- For the MULTIVAR_COMPLEX: One input is a MULTIVAR content matrix having greater than one pair of fields and the other matrix is a MULTIVAR content of the same type having just one pair of payload fields.
- For all the cases, there are no requirements regarding the dimensions (number of matrix rows and number of matrix columns), though typically the filter matrix has considerably smaller dimensions than the matrix being filtered.