QREx
Advanced Analysis Library Only
AnalysisLibErrType QREx (void *inputMatrix, ssize_t numberOfRows, ssize_t numberOfColumns, int pivot, int sizeOption, void *pivotInfo, void *qMatrix, void *rMatrix);
Purpose
Calculates the QR factorization for a real matrix. QREx factorizes A as AP = QR, where P is a permutation matrix, Q is an orthogonal matrix, and R is an upper triangular matrix. If numberOfRows > numberOfColumns, sizeOption is ECONOMY_SIZE and rMatrix is NULL or inputMatrix. On output, the leading numberOfColumns rows in inputMatrix are the upper triangular matrix R.
National Instruments recommends you use this function instead of QR.
Parameters
| Input | ||
| Name | Type | Description |
| inputMatrix | void * | The input matrix. |
| numberOfRows | ssize_t | The number of rows of inputMatrix. |
| numberOfColumns | ssize_t | The number of columns of inputMatrix. |
| pivot | int | Specifies how to pivot inputMatrix. pivot must be one of the following values:
|
| sizeOption | int | The size option for qMatrix and rMatrix. sizeOption must one of the following values:
|
| Output | ||
| Name | Type | Description |
| pivotInfo | void * | The pivoting information if pivot is PIVOT_VECTOR or PIVOT_MATRIX.
|
| qMatrix | void * | The orthogonal matrix Q. If qMatrix = NULL, qMatrix is not generated. |
| rMatrix | void * | The upper triangular matrix R. Set rMatrix to NULL or inputMatrix to perform in place operation. |
Return Value
| Name | Type | Description |
| status | AnalysisLibErrType | A value that specifies the type of error that occurred. Refer to analysis.h for definitions of these constants. |
Additional Information
Library: Advanced Analysis Library
Include file: analysis.h
LabWindows/CVI compatibility: LabWindows/CVI 8.0 and later