org.netlib.lapack
Class SLAQSP
java.lang.Object
org.netlib.lapack.SLAQSP
public class SLAQSP
- extends java.lang.Object
SLAQSP is a simplified interface to the JLAPACK routine slaqsp.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines. Using this interface also allows you
to omit offset and leading dimension arguments. However, because
of these conversions, these routines will be slower than the low
level ones. Following is the description from the original Fortran
source. Contact seymour@cs.utk.edu with any questions.
* ..
*
* Purpose
* =======
*
* SLAQSP equilibrates a symmetric matrix A using the scaling factors
* in the vector S.
*
* Arguments
* =========
*
* UPLO (input) CHARACTER*1
* Specifies whether the upper or lower triangular part of the
* symmetric matrix A is stored.
* = 'U': Upper triangular
* = 'L': Lower triangular
*
* N (input) INTEGER
* The order of the matrix A. N >= 0.
*
* AP (input/output) REAL array, dimension (N*(N+1)/2)
* On entry, the upper or lower triangle of the symmetric matrix
* A, packed columnwise in a linear array. The j-th column of A
* is stored in the array AP as follows:
* if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
* if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.
*
* On exit, the equilibrated matrix: diag(S) * A * diag(S), in
* the same storage format as A.
*
* S (input) REAL array, dimension (N)
* The scale factors for A.
*
* SCOND (input) REAL
* Ratio of the smallest S(i) to the largest S(i).
*
* AMAX (input) REAL
* Absolute value of largest matrix entry.
*
* EQUED (output) CHARACTER*1
* Specifies whether or not equilibration was done.
* = 'N': No equilibration.
* = 'Y': Equilibration was done, i.e., A has been replaced by
* diag(S) * A * diag(S).
*
* Internal Parameters
* ===================
*
* THRESH is a threshold value used to decide if scaling should be done
* based on the ratio of the scaling factors. If SCOND < THRESH,
* scaling is done.
*
* LARGE and SMALL are threshold values used to decide if scaling should
* be done based on the absolute size of the largest matrix element.
* If AMAX > LARGE or AMAX < SMALL, scaling is done.
*
* =====================================================================
*
* .. Parameters ..
Method Summary |
static void |
SLAQSP(java.lang.String uplo,
int n,
float[] ap,
float[] s,
float scond,
float amax,
StringW equed)
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
SLAQSP
public SLAQSP()
SLAQSP
public static void SLAQSP(java.lang.String uplo,
int n,
float[] ap,
float[] s,
float scond,
float amax,
StringW equed)