org.netlib.lapack
Class DSPCON
java.lang.Object
org.netlib.lapack.DSPCON
public class DSPCON
 extends java.lang.Object
DSPCON is a simplified interface to the JLAPACK routine dspcon.
This interface converts Javastyle 2D rowmajor arrays into
the 1D columnmajor 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
* =======
*
* DSPCON estimates the reciprocal of the condition number (in the
* 1norm) of a real symmetric packed matrix A using the factorization
* A = U*D*U**T or A = L*D*L**T computed by DSPTRF.
*
* An estimate is obtained for norm(inv(A)), and the reciprocal of the
* condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).
*
* Arguments
* =========
*
* UPLO (input) CHARACTER*1
* Specifies whether the details of the factorization are stored
* as an upper or lower triangular matrix.
* = 'U': Upper triangular, form is A = U*D*U**T;
* = 'L': Lower triangular, form is A = L*D*L**T.
*
* N (input) INTEGER
* The order of the matrix A. N >= 0.
*
* AP (input) DOUBLE PRECISION array, dimension (N*(N+1)/2)
* The block diagonal matrix D and the multipliers used to
* obtain the factor U or L as computed by DSPTRF, stored as a
* packed triangular matrix.
*
* IPIV (input) INTEGER array, dimension (N)
* Details of the interchanges and the block structure of D
* as determined by DSPTRF.
*
* ANORM (input) DOUBLE PRECISION
* The 1norm of the original matrix A.
*
* RCOND (output) DOUBLE PRECISION
* The reciprocal of the condition number of the matrix A,
* computed as RCOND = 1/(ANORM * AINVNM), where AINVNM is an
* estimate of the 1norm of inv(A) computed in this routine.
*
* WORK (workspace) DOUBLE PRECISION array, dimension (2*N)
*
* IWORK (workspace) INTEGER array, dimension (N)
*
* INFO (output) INTEGER
* = 0: successful exit
* < 0: if INFO = i, the ith argument had an illegal value
*
* =====================================================================
*
* .. Parameters ..
Method Summary 
static void 
DSPCON(java.lang.String uplo,
int n,
double[] ap,
int[] ipiv,
double anorm,
doubleW rcond,
double[] work,
int[] iwork,
intW info)

Methods inherited from class java.lang.Object 
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait 
DSPCON
public DSPCON()
DSPCON
public static void DSPCON(java.lang.String uplo,
int n,
double[] ap,
int[] ipiv,
double anorm,
doubleW rcond,
double[] work,
int[] iwork,
intW info)