You are here: NI Home > Support > Product Reference > Manuals > LabVIEW 8.5 Help

Calculates the rank–k update of the upper or lower triangular component of a symmetric matrix.

The data types you wire to the A and C inputs determine the polymorphic instance to use.

Details  

Use the pull-down menu to select an instance of this VI.

Select an instance dsyrk - Symmetric Rank-k Update (DBL)zsyrk - Symmetric Matrix-Matrix Rank-k Update (CDB)

dsyrk - Symmetric Rank-k Update (DBL)

	operation A specifies the operation the VI performs on A to generate matrix op(A). 0 Direct (default) 1 Conjugated & Transposed 2 Transposed
	A is a real matrix with dimensions N × K.
	C is a real symmetric matrix of at least dimensions N × K, or K × N if you set operation A to Transposed.
	matrix C type specifies whether to update the upper or lower triangular component of C. 2 Lower Triangular—The VI uses only the lower triangular component of C to calculate the rank–k update. 3 Upper Triangular (default)—The VI uses only the upper triangular component of C to calculate the rank–k update.
	alpha is a real scalar that scales A*A^T or A^T*A, where A^T represents A transposed. The default is 1.
	beta is a real scalar that scales C. The default is 1.
	dsyrk is a real matrix of the same dimensions as C. For the elements in the first N rows and N columns of the triangular component you select for matrix C type, dsyrk returns the results of the calculation. For any other elements, dsyrk returns the value of the element in C with the same index.
	error returns any error or warning from the VI. You can wire error to the Error Cluster From Error Code VI to convert the error code or warning into an error cluster.

zsyrk - Symmetric Matrix-Matrix Rank-k Update (CDB)

	operation A specifies the operation the VI performs on A to generate matrix op(A). 0 Direct (default) 1 Conjugated & Transposed 2 Transposed
	A is a complex matrix of dimensions N × K.
	C is a complex symmetric matrix of at least dimensions N × K, or K × N if you set operation A to Transposed.
	matrix C type specifies whether to update the upper or lower triangular component of C. 2 Lower Triangular—The VI uses only the lower triangular component of C to calculate the rank–k update. 3 Upper Triangular (default)—The VI uses only the upper triangular component of C to calculate the rank–k update.
	alpha is a real scalar that scales for A*A^T or A^T*A, where A^T represents A transposed. The default is 1.
	beta is a complex scalar that scales C. The default is 1.
	zsyrk is a complex matrix of the same dimensions as C. For the elements in the first N rows and N columns of the triangular component you select for matrix C type, zsyrk returns the results of the calculation. For any other elements, zsyrk returns the value of the element in C with the same index.
	error returns any error or warning from the VI. You can wire error to the Error Cluster From Error Code VI to convert the error code or warning into an error cluster.

syrk - Symmetric Matrix Rank-k Update Details

Refer to BLAS (Basic Linear Algebra Subprograms) for more information on the BLAS functions.