org.netlib.lapack
Class Slaexc
java.lang.Object
org.netlib.lapack.Slaexc
public class Slaexc
- extends java.lang.Object
Following is the description from the original
Fortran source. For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
Contact seymour@cs.utk.edu with any questions.
* ..
*
* Purpose
* =======
*
* SLAEXC swaps adjacent diagonal blocks T11 and T22 of order 1 or 2 in
* an upper quasi-triangular matrix T by an orthogonal similarity
* transformation.
*
* T must be in Schur canonical form, that is, block upper triangular
* with 1-by-1 and 2-by-2 diagonal blocks; each 2-by-2 diagonal block
* has its diagonal elemnts equal and its off-diagonal elements of
* opposite sign.
*
* Arguments
* =========
*
* WANTQ (input) LOGICAL
* = .TRUE. : accumulate the transformation in the matrix Q;
* = .FALSE.: do not accumulate the transformation.
*
* N (input) INTEGER
* The order of the matrix T. N >= 0.
*
* T (input/output) REAL array, dimension (LDT,N)
* On entry, the upper quasi-triangular matrix T, in Schur
* canonical form.
* On exit, the updated matrix T, again in Schur canonical form.
*
* LDT (input) INTEGER
* The leading dimension of the array T. LDT >= max(1,N).
*
* Q (input/output) REAL array, dimension (LDQ,N)
* On entry, if WANTQ is .TRUE., the orthogonal matrix Q.
* On exit, if WANTQ is .TRUE., the updated matrix Q.
* If WANTQ is .FALSE., Q is not referenced.
*
* LDQ (input) INTEGER
* The leading dimension of the array Q.
* LDQ >= 1; and if WANTQ is .TRUE., LDQ >= N.
*
* J1 (input) INTEGER
* The index of the first row of the first block T11.
*
* N1 (input) INTEGER
* The order of the first block T11. N1 = 0, 1 or 2.
*
* N2 (input) INTEGER
* The order of the second block T22. N2 = 0, 1 or 2.
*
* WORK (workspace) REAL array, dimension (N)
*
* INFO (output) INTEGER
* = 0: successful exit
* = 1: the transformed matrix T would be too far from Schur
* form; the blocks are not swapped and T and Q are
* unchanged.
*
* =====================================================================
*
* .. Parameters ..
|
Method Summary |
static void |
slaexc(boolean wantq,
int n,
float[] t,
int _t_offset,
int ldt,
float[] q,
int _q_offset,
int ldq,
int j1,
int n1,
int n2,
float[] work,
int _work_offset,
intW info)
|
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Slaexc
public Slaexc()
slaexc
public static void slaexc(boolean wantq,
int n,
float[] t,
int _t_offset,
int ldt,
float[] q,
int _q_offset,
int ldq,
int j1,
int n1,
int n2,
float[] work,
int _work_offset,
intW info)