org.netlib.lapack
Class Sptcon

java.lang.Object
  extended by org.netlib.lapack.Sptcon

public class Sptcon
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 * ======= * * SPTCON computes the reciprocal of the condition number (in the * 1-norm) of a real symmetric positive definite tridiagonal matrix * using the factorization A = L*D*L**T or A = U**T*D*U computed by * SPTTRF. * * Norm(inv(A)) is computed by a direct method, and the reciprocal of * the condition number is computed as * RCOND = 1 / (ANORM * norm(inv(A))). * * Arguments * ========= * * N (input) INTEGER * The order of the matrix A. N >= 0. * * D (input) REAL array, dimension (N) * The n diagonal elements of the diagonal matrix D from the * factorization of A, as computed by SPTTRF. * * E (input) REAL array, dimension (N-1) * The (n-1) off-diagonal elements of the unit bidiagonal factor * U or L from the factorization of A, as computed by SPTTRF. * * ANORM (input) REAL * The 1-norm of the original matrix A. * * RCOND (output) REAL * The reciprocal of the condition number of the matrix A, * computed as RCOND = 1/(ANORM * AINVNM), where AINVNM is the * 1-norm of inv(A) computed in this routine. * * WORK (workspace) REAL array, dimension (N) * * INFO (output) INTEGER * = 0: successful exit * < 0: if INFO = -i, the i-th argument had an illegal value * * Further Details * =============== * * The method used is described in Nicholas J. Higham, "Efficient * Algorithms for Computing the Condition Number of a Tridiagonal * Matrix", SIAM J. Sci. Stat. Comput., Vol. 7, No. 1, January 1986. * * ===================================================================== * * .. Parameters ..


Constructor Summary
Sptcon()
           
 
Method Summary
static void sptcon(int n, float[] d, int _d_offset, float[] e, int _e_offset, float anorm, floatW rcond, 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
 

Constructor Detail

Sptcon

public Sptcon()
Method Detail

sptcon

public static void sptcon(int n,
                          float[] d,
                          int _d_offset,
                          float[] e,
                          int _e_offset,
                          float anorm,
                          floatW rcond,
                          float[] work,
                          int _work_offset,
                          intW info)